McMartin BF-5K User manual
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MCMarti~
5500 Watt
FM
TRANSMITTER
INSTRUCTION
MANUAL
I.
TECHNICAL
SPECIF!
CATIONS
II.
GENERAL
DESCRIPTION
Ill.
INSTALLATION
IV.
OPERATION
page
2
6
V.
DETAILED
CIRCUIT
DESCRIPTION
7
VI.
REMOTE
CONTROL
10
Vtl.
MAINTENANCE
10
VIII.
PARTS
LIST
11
WARRANTY
13
IX.
SCHEMATIC
DIAGRAMS 14
X.
APPENDIX
A
(8-910Manual)
..
..
following
Schematic
Diagrams
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INTRODUCTION
WARNING:
Voltages
and
cur;ents
in
this
equipment
are
dangerous.
Installation,
opera-
tion,
ar.d
servicing
of
t
his
equipment
must
be
performed
only
~Y
properly
licensed,
trained,
and
experienced
personnel.
McMartin
Industries
cannot
·be
respons
i
ble
fer
injury
or
damage
resulting
from
improper
installation,
operation,
or
ser,icing
of
this
equi;:ment.
/
Always
disconnect
;,r
imar1
power
before
openir.g
deers,
covers,
enc
l
osures,
par.els,
or
shields.
Always
use
;rauncing
sticks
to
short
cut
hi;h
voltage
qoi
nts
before
serv
icing.
N~ver
perform
service
on this
equipment
when
tired
er
alone.
It
i·s
most
im;:orta:,t
t
hat
al
l uni
ts
be bonded
tcgether
with
at
l
eas,
3~
w
ic
e
c::ccer
strap
which
is
se..:ureiy
connected
to the
MAIN
STATION
GRGUNO.
Heat
a.1c
din
ar~
the
main
cestroyers
of
good
ec;uiprr.ent.
Keeo
yours
clean
and
cool,
and
you
wi ll be
rewarded
by
long,
reliable
service.
Preventat
i
ve
main
t
enance
is f
ar
more
des
irea!:Jle
!han t:-:at dor.:e
only
when
absolutely
necessar;.
Fol
l
ow
geed
engi
neering
prac:ice
in
e•1er1thing
you
do
in
c~nnecticn
with
the
operation
of
this
equipr.,ent.
CAUT10N:
If
your
t;ar.smitter
is
sup;;lied
for
use
en
3
pr.asa pri
~ary
po
w
er,
it is
extl"emely
important
tli~,
'JCU
are
;:rovided
wi th
serv
i
ce
frcm
a
cl
osad-dal
ta
scurca.
°Check
this
with
y·our-·
local
;:ewer
company.
Medel
2
F-5K
8r-3.5K
8F-1K
oA-10K
:A-5
K
8A-2
•
.:
K
5,.l.
.
-1K
Minimum
U:ires~ricte-d
,; ir
i=
l
c•,•1
Required
fer
~.lc~.1artin
;.l.~1
& r ~l
Tr
ansm
i
t,~rs
.
FM
CR-:1
5000
2500
STU'S
Heat
Out:wt
2CC0
1000
1000
800
AM
1500
1500
saa
8G0
17COOO
9C0C0
62000
38000
20500
EcCO
23CCO
1
csao
_
.imole
air
i
.itake
cacac
it
y to :
:ia
oui
l
cing
,11ust
:a
;:::rcv
ic
ad
ar:c:
:he air
dI::c
·n
a:,;a
syst:=m
f
:-or..
:he
bui
lding
must
:e
suff
ici
ent
so tl'lat
r.
o res
:rj
ct
ior.
er
tac
:,
pr
~ssure
exi-sts.
It
is =~~:mmeriC!aC t~at
:n
-::x
r.
ausl
fan of
at
1~3s-:
tha same
,
:=;=
~
..
!. as
:ii~!
sho
·,
Nn
:
or
t~e
~ra.,s-7:
itt
ar,
Ce
i
nst~
tl
e4j
ii
i
~~=
1:~
il
di;ig
air
c:
i
sc~:!r;a
sy~~
err.~
1-------------
<
.
....
<
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I
MC
Martin.
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TECHNICAL
SPEC1FICATIONS
OPERATING
RANGE
.•.•..•••.
RF
POWER
OUTPUT
••••.•••
RF
OUTPUT
IMPEDANCE
•.••.
CENTER
FREOUENCY
STABILITY
•.••••
MODULATION
CAPABILITY
•.••
AUDIO
INPUT
IMPEDANCE
..•.
.
AUOIO
INPUT
L.EVEL
••••.•.•.•
AUOIO
FREQUENCY
RESPONSE
•••.•.•
TOTAL
HARMONIC
DISTORTION
•..••
FM
NOISE
•••
•
...•
AM
NOISE
•••.•••.
POWER
REQUIREMENTS
••
POWER
CONSUMPTION
(Approx.)
....
.
..
.
OPERATING
TEMPERATURE
..
ALTITUDE
......
.
MECHANICAL
.
...
WEIGHT
........
.
FINISH
.........
.
...•••••••
88
to 108 MegaHertz
.•••••••.
5.500
watts
maximum
.••.•••••••••.••••••
SO
ohms
(termination
E!A
1-5/8"
flange)
•
..•.•••••.••••.•••••
±SO
_OHz
....................
!
150 Hz
..•..••...•
500 ohms. balanced
••••.•••••••.•..
+10,
j:2.
dBm
......•.
:t0.75
dB,
30-15000
Hz
(Std.
FCC
75
usec
pr~mphasis)
...•.
0.3%
of
less.
30-15000
Hz.
100'1/o
modulation
. . • • • . 55
dB
below 100% modu-
lation
(400
Hz)
..•••.
55
dB
below
carrier
level
...
.
208/230/240
Vac,
50/60
Hz.
single
phase.
or
208/230/240
Vac, 3-phase
30
standard
. 3500
watt
output,
7,200
watts
4500
watt
output,
10,000
watts
5000
watt
output, 11,250
watts
5500
watt
output, 12,500
watts
.....•.......
o
0
to
50°
Celsius
. . . . . .
..
7,500 feet above
mean
sea
level
........
34.S"W 78.S'"H
31"0
(87.5 X 199 X 78.7 cm)
Rear Door Swing
30"
(76.2 cm)
. . . . . . . . . . . . . . • . 1,200 pounds
...
Mc:,1artin beige
w/woodgrain
trim
STEREO
OPERATION
.(with
B-110
Stereo
Assembly)
AUDIO
INPUT
IMPEDANCE. •
...
12177
......
600 ohms balanced. each
channel
AUDIO
INPUT
LEVEL
•.
•
..•.•
• .
AUOIO
FREQUENCY
RESPONSE .
...
..
.
TOTAL
HARMONIC
DISTORTION
.•.••
STEREO
SEP
ARA
T!ON
.•..
FM NOISE
..
.
....
.
PILOT
STABILITY
.....
.
SUBCARRIER
SUPPRESSION
....
CROSSTALK
(L+R
to
L-R,
L·R
to
L+R)
.....
.
...•••.•..••••...
+10,j:2,
dBm
........
±0.75
dB. 30-15000 Hz.
Std.
FCC
75
usec•.preemphasis
each channel"
.
...•
0.5%or
less.
30-15000 Hz
..
35
dB
or
greater, 50-15000
Hz
...•..•.
60
dB
or
greater below
100%
modulation
.
....•...
±1.0
Hertz
over
rated
temperature range
......•.......
55
dB
or
greater
........
42
dB
or
greater below
90%
modulation
SCA
OPERATION
(with
B-113 SCA Generator Module)
AUOIO!
INPUT
IMPEDANCE
.....
AUDIO
INPUT
LEVEL.
.........
.
CARRIER
FREQUENCY
.....
CARRIE!=t
STABILITY
..
..
..
.
MODULATION
CAPABILITY
. .
..
.
PREEAPHASIS.. .
FREQUENCY
RESPONSE
.....
.
CROSSTALK
(main
to
sub,
sub
to
main) .
....
.
DISTORTION
(50-5000
Hz)
.....
.
S/N
NOISE .
...
..
.
.
......•...
600 ohms, balancea
..•....••........
+10,
±2.
dBm
.
...•....
41
or 67 kHz standard
(others
available
on
request)
...
.
.....
.
..........
.±500 Hz
..
.
................
;!:7
.
SkHZ
.......
1
SO
usec standard.
50
or
75 us~c avai !able
on
raquest
.
.........
!1.5
dB, 50-5000 Hz
.......
.
........
60
dB
or
lower
..
0.75% or less
with
LP
output
filter,2.5%or
less
with
BP
OU
tput fl Iter
.
..
.
.......
..
. 60
dB
or
greater
II.
GENE~AL
DESCRIPTION
The McMartin
SF-5K
transmitter
is designed for
FM
:ir;::adcast service, operating
on
a
specific
frequency in
:he
range
ot
88.0 to 108.0 MegaHertz.
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The
BF-SK
utilizes
the Model
8-910
solid-state
FM
exciter.
Full
technical
details
pertaining
to
the
8-910
operation are contained in Appendix A ot
this
manual.
The
RF
output
of
the
exciter
is
used to
drive
an
inter-
mediate power
amplifier
(IPA)
stage wl'lic:h employs
paral-
lel-connected type 4CX2508 radial
beam
power tetrode
tubes.
This
stage in tum provides
RF
excitation
to a
single
type
3CX3000/A7
high-mu, zero-bias triode tube
in
the power
amplifier
(PA)
stage. The
PA
stage oper-
ates
as
a
Class
C
ampllfler,
in a grounded-grid configura-
tion.
A low.-pass
AF
filter
mounted
within
the cabinet
enclosure attenuates hannonicaily-f'elated frequencies
at
the
transmitter
output termination.
A
single
high-voltage
power supply provides
plate
vol•
tage for the
PA
and
IPA
stages.A
sei,arate power supply
provides
IPA
screen voltage
which
is
adjustable
by
means
of
a
motor~riven
power
output
control from the
front
panel. Independent transfonners provide fl lament
voltages
to
the
PA
and
IPA
tubes,
with
a front panel
FlLAMENT ADJUST
control.
lnasmucn as the
PA
tube
is
a
high-mu power triode spe-
ciflcally
designed tor zero grid bias,
its
operation in a
grounded-grid mode
eliminates
the need tor screen grid
and grid bias power
supplies.
This
permits great
sim-
plification
of
circuitry.
Interlocked
control
logic
permits straightforward push-
button CQntrol
at
all
start-stop
functions.
These, plus
telemetering
sampl~
are terminated tor interconnection
to remote control systems.
Automatic
recycling
and a memory-type
LEO
status
i
ndlcator
assembly
senses
and
indicates
the cause ot
carrier
interruptions.
speciflc:ally
in
the event
of
exciter
RF
output.
IPA
or
PA
failure,
high
voltage
overload
or
or
excessive
VSWR.
The
automatic
recycling
sequence
~nsists
of two pulses spaced approximately one-second
apart. followed
by
an
adjustable
time
interval
from 3
to
20
sectlnds
after
which the two
pulses
are repeated.
It
the
fault
still
persists.
the
recycling
sequence
is
termina-
ted.
An
"overcount"
.
as
well
as the soun:e
of
the
fault
is
shown
on
the
indicator
panel
LED.
If anywhere in the
recycling
sequence, the
transmitter
is
restored to normal
operation, the
LEO
indicator
associated
witn
the
fault
remains
on
until
the manual
RESET
switch
is depressed.
Adequate
cooling
is
provided
oy
maintenance of
positive
cabinet
pressure. The
airflow
routing
is
through
the
shielded
IPA
compartment and upward through the PA
shielded
e:,ctosure. The
airtlow
Is provided
by
means
of
a rugged, permanently-lubricated.
centrifugal
blower,
shock-mounted on the base
of
the
transmitter
cabinet. Its
outlet
is
ducted to the bottom
of
the I
PA
enclosure.
Supplemental
cooling
tor power supply components
is
provided
by
a small exhaust
tan
located in the top
of
the
~
cabinet.
Air
entering the
transmitter
is
filtered
by
dual,
maintainable
fl
lters
mounted
0:1
the rear door
of
the
cabinet.
The
rear door opening
is
prote<:ted
with
dual mechanical
intertocl<
switches.
one
ot
which
defeats
the
high-voltage
2
control
circuitry.
The other shorts the hiqh-vnltage plate
power
supply to ground.
An
insulated "grounair.g
stic,c".
located
just
inside
the cabinet
at
the door openmg
is
also
provided.
111.
INSTALl.ATlON
3.1
PLAHHING
It
is
recommended tnat the manual
be
studied in
its
en-
tirety
prior
to
final
instattatio~
ot
the
8F-5K
. A
full
understanding
of
the
controls,
c2rcuI try and input
and
out-
put
terminations 'Nill
assist
in the preplanning stage.
Figure
1
is
an
outline
dlmensional drawing of the trans-
mitter.
Provide
adequate clearances tor access to the
transmitter
through the rear. Preplan the location
of
the
entrances for power,
audio/remote
control cable harnes-
sing,
external monitoring
coaxial
cable
teed and the
RF
output connection to the
coaxial
transmission
line.
The
BF-SK ·
output termination
is
by .means
of
an
EIA
1
·5/8"
flange.
This
flange
with
a short
section
of
1-5/8"
rigid
line
mates
with
an
ungassed
field
coui,ling
clamped to
the
output
of
the harmonic
filter.
These
coaxial
line
com-
ponents are
pacl<ed
separately and should be assembled
to
ascertain
the
precise
physical
location
ot
the output
termination.
AI
though cable entrances
may
be
made through ei
mer
the top
or
bottom
of
the cabinet, the preferred arrange-
ment tor
ease
ot
installation
is
through the bottom ~n-
trances to the
cabinet
for
all
interconnections except
the
output
coaxial
transmission
line.
3.2 UNPACKING
Inspect
the
unit
for damage which might be incurred dur•
ing
shipment.
Particularly
note
condition
of
knobs, .
meters and ceramic
insulators.
Inspect
painted surfaces
for
dents
or
scratches.
If
damage is detected, immedi-
ately
notify
the
earner
and
advise
McMartin ot steps you
have taken.
The tubes
will
normally
be
packed separately.
Install
these in
their
respective
sockets.
3.3
EXTERNAL
CONNECTIONS
A
11
external connections are made from the rear
at
the
cabinet.
(Directions
given below,
right
or
left,
are
based
on
rear
view
access.)
3.3•1
RF
Output
The
RF
output termination
is
an
EIA
standard
1·5/8"
coaxial
end flange located at the top
of
the RF harmonic
tiIter. The external coaxial Iine
run
should be terminated
to
this
coupling.
The external
line
should be secured so
tnat
excessive
lateral or
vertical
pressure is not exerted
on
tne output termination. The
coaxial
line
output com-
ponents are .packaged separately
and
should
be
assem-
bled
prior
to connection
of
the external transmission
line.
3.3-2
Audio Input
The audio input termination
strip
is located
at
t~e lower
left
of
the cabinet. Jacketed, two-conducter shielded
cable
should
be
used. Monaural
or
lett-cnanne! stereo
input
should
be
connected
to
TS-12(3
&
4),
Right-cnannel
, audio input should
be
ccnnected
to
T8•3
(6
&
7).
If
SCA
operation
is
used, tne SCA audio input should
be
connec•
ted
to
TB-3 (1
&
2). Shield grounds should
be
made to
T8•3
(5
or
8.)
3..3-3 Monitor C<lnnectlons
The RF
drive
tor
FM
frequency
and/or
modulation moni•
taring equipment
may
be
taken
from
either
of
two tennina-
tions.
each of which are of the
BNC
type. One
ot
these
is
located
directly
above
the main housing
ot
the RF
output
tilter.
This
is
a fixed-probe type
pIck~it
point.
The other
is
located
on
the le
!t
side
ot
tne
PA
enclo•
sure adjacent to the coaxial leed to the RF harmonic
tilter
input
port. This
is
the termination of a pickup loop
wnich
may
be
mechanically
orier
,ted in relation to the
PA output connection
to
tne
ti
Iter.
This
loop is readily
accessible
tor adjustment
by
opening the rear door ot
ttie PA stage compartment.
The
coaxial
cable
rrom
the
pick
up
point
is
terminated
on
TS-2 (5
&
6).,
#5
ground. The external cable should
be
of
the
flexible
coaxial type.
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4
REMOTE
PLATE
ON
REMOTE
PLATE
OFF
I
[
___
0--'-3
_0_2_0____,,
I
TB-11
.-------
REMOTE PA
CURRENT--------,
REMOTE
PLATE
VOLTAGE------,
i----
REMOTE LOWER POWER -
TB
-131
___
0_
1
_0----'
2
__
0_
3
_0_
4
__
0_
5
__
0_
6
__
0_
7
__
0....;_,
8
I
FIG
. 2 REMOTE CONTROL
TERMINAL
BLOCKS
FIGURE
2
■
REMOTE
CONTROL
TERMINAL
BLOCKS
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MC
Martin.
3.3-4 Power Connections
The
transmitter
will
be
equipped
for
either
single-phase
or
three-phase primary power
operation;
whichever
is
spe-
cified
in
your
order.
In
either
case,
before
connecting
to
the power
source,
consult
wi
th
your
local
utility
company
as to the nominal
voltages
available
at
thetransmIttersIte.
A. Single Phase Model
Four-wire
service
entrance
cable
with
minimum
#8
wire
size
should
be used.
The
ground lead
should
be
secured to the ground
terminal
adjacent
toT8-10(Ioca-
ted
at
the
rear
of
the
cabinet)
.
Neutral
lead
should
be
connected
to
TB-10
(7) and the
remaining
conductors
to
TB-10(8
&
9).
B,
3-Phase Model
Refer
to the
schematic
diagram for
interconnection
of
three-phase
service.
This
version
differs
from the
single-phase
model
only
in the primary
wiring
for
the
plate
trans.former and the
recti
tier-stack
arrange-
ment.
3.4
REMOTE
CONTROL
CONNECTIONS
If
the
8F-5K
is to be operated from a remote point,
additional
interconnection
is
required
to
TB-13.
See
Figure 2
for
terminal
coard i
dentification.
The f
ollowing
functions
may be
controlled:
1)
Start
2)
Stop
3)
Power
output
The
fol
lowing
functions
may be metered:
1)
PA
plate
voltage
2)
PA
plate
current
3)
Power
output
or
reflected
power
3.5
INITIAL
TUNE-UP
PROCEDURE
The
BF-SK
is
now ready
for
i
nitial
tune-up.
The
trans-
mitter
has been
factory
tested
and tuned to
your
speci
f
ied
operating
frequency and
nominal
output
power
l
evel.
These
factory
tests
i
nclude
operation
into
a 50-ohm non-
reactive
load;
therefore
all
tuning
control
adjustments
will
approximate
t
hose
you
will
encounter
in the f
ollow-
ing tune-up
procedure.
At
this
time
you
should
calculate
the
exact
transmitter
output
power
you wi ll
require
to
satisfy
the
effective
radiated
power
(
ERP)
speci
lied
in the
stat
ion
construc-
tion
permit
or
license.
This
will
be
equivalent
to the
ERP
,
divided
by
your
antenna
power
gain,
plus
losses
incurred
in the t
ransmission
line
feeding
the transmi
tter
output
to the antenna
terminations.
As
a
guide
for
var
ious power
output
operating
level
s,
the
following
tabulation
will
be
helpful
in
evaluating
typical
operating
parameters for the
PA
output
stage.
TABLE
I
Power
output:
3,500
4,500
5,000
5,500watts
PA
Plate
Voltage:
4.1 4.6
4.6
4.8 KV
PA
Plate
Current:
1.1
1.25
1.35
1.
95
A
PA
Cathode (
Grid
&
Plate
)
Current
: 1.6
1.
75
1.8
1.9
A
PA
Power
Input
: 5,060
5,750
6,210
6.960watts
Effic
i
ency
: 69
78
80
79
%
Precise
PA
efficienc
ies f
or
y
our
operating frequency and
power
are
plotted
in Figure 3. The t
ransmitter
output
power
where the i
ndirect
OU
tput power measurem
en
t .is
employed
is
the
product
of
PA
pl
ate
voltage
and
PA
plate
current
multiplied
by the
appropriate
effeciency
factor
from
Figure
3.
Proceed
as fo ll
ows
wi
th th
e tune-up.
1.
Refer
to
''
Appendi
,x
A'
',
Section
V -
OPERAT
ION
(page
11
of
8-910
Instruction
Manua
l)
f
or
i
ni
tial oper-
ation of the
exciter
portion
of
the t:JF•5K.
2.
Posit
i
on
the ci
rcuit-breaker
switches
l
ocated
on
lef
t
hand
side
of the
horizontal
ledge below the
exciter
to
•ON".
3. Momentari ly depress the ST
ART
pushbutton.
START
indicator
lamp
will
come on.
This
will
provide
pri-
mary ac power to the exci
ter
and energize the
cabinet
blower
,
exhaust
f
an
and the tube fi lament
s.
AIR
,
FIL-
AMENT
,
BIAS
, and 24
VAC
i
ndicator
lamps
wi
ll be
FIGURE
3 •
TYPICAL
EFFICIENCY
VS.
FREQUENCY
75
74
L----
>,
<.J
-----
C:
;:,
<.J
73
-
::
w
72
71
I I
I
-+---
I I
I
I 1 I
--
r--+--_
j ·
I I
I
88
90
92
94
96
98
100
102
104
106
!08
Frequency
12/
77
5
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I 6
iIluminated.
After
approximately
2
minutes,
PLATE
OFF
pushbutton
will
be
illuminated.
Read
FILAMENT
VOLTAGE
panel meter and
set
FILAMENT
ADJUST
control
for
·7
.5
volts.
Confirm
that
correct
line
vol-
tage
is
being
supplied
by
operation
of
LINE
VOL-
TAGE
selector
switch.
(For
single-phase
installations
positions
1 & 2 measure each
side
of
the nominal 230
v supply to n!3utral; and for three-phase
units,
posi-
tions 3, 4 & 5 measure the v
oltage
across each leg to
neutral.) ·
4.
After
completing
the
exciter
tuning procedures, turn
the POWER
OUTPUT
control
on
the
8-910
exciter
module
completely
counterclockwise.
5.
Place
MULTIMETER
select
switch
to
IPA
GRID
CURRENT
position.
Slowly rotate the
exciter
POWER
OUTPUT
control
until
a reading
is
noted
on
the mul-
timeter.
Adjust
IPA
GRID
control
for a peak in the
multimeter
reading and
adjust
8-910
POWER
OUTPUT
controI for a reading
of
20
mi
11
iamperes.
6. Operate POWER
OUTPUT
control
in LOWER
position
until
motor
drive
stops. Set
MULTIMETER
switch
to
I
PA
1
CATHODE
CURRENT
position.
Apply opera-
ting
voltage
to the
IPA
and
PA
tubes by momentarily
.
depressing
the
PLATE
ON
pushbutton.
PLATE
ON
pushbutton wi
11
come on,
PLATE
OFF
lamp
wi
11
be
extinguished.
Confirm
that
PA
PLATE
VOLT
AGE
reading
is
in approximate agreement
with
the typical
PA
Plate
Voltage
Values shown in
TABLE
I.
7. Operate POWER
OUTPUT
control
until
IPA
CATH-
ODE
CURRENT
reaches
approximately
100
mi
Iiiam-
peres. Ad j
ust
!
PA
TUNE
control
for minimum cathode
current.
At
the same time, observe the
PA
PLATE
CURRENT
meter, and
during
following
i
nitial
adj
ust-
ments. do
not
exceed 1.0 ampere.
When
PA
PLATE
CURRENT
approaches
this
value,
adjust
PA
PLATE
TUNE knob for minimum
PLATE
CURRENT
and pro-
ceed
with
tune-up of
IPA
stage.
8. Al
ternately
adjust
!PA
TUNE
and
IPA
LOAD
cont
rols
so as
to
produce maximum
PA
PLATE
CURRENT
reading. There wi II be i
nteract
i
on
between these con-
trol
s.
Whenever a change
is
made in the
IPA
LOAD
control,
readjust
IPA TUNE
control
for minimum
IPA
1
CATHCOE
CURRENT.
As
an
·impedance match
is
achieved between the
!PA
output
and
PA
input
cir-
cu
itry, the dip in
IPA
cathode
current
will
become
less pronounced.
9. Place
MULT
I
METER
switch
in
PA
CATHODE
CUR-
RENT
position.
The reading
will
be
somewhat
higher
in
value
than
thePA
PLATE
CURRENT
meter reading.
The
difference
in v
alue
represents the
PA
grid cur-
rnnt. Operate the POWER
OUTPUT
control
un
ti I the
PA
CATHODE
CURRENT
is
approximately
350
mi
I
ii-
amperes
higher
than the
PA
PLATE
CURRENT
READING.
10.
Place
REFLECTOMETER
meter
switch
in
FWD
(for-
ward power)
position.
Adj
ust
PA
TUNE
and
PA
LOAD
controls
for maximum reading
on
the
REFLECTO-
METER.
wh
i
le
at
all
times
mainta
i
ning
PA
PLATE
CURRENT
at
mini
mum
as
the
PA
LOADING
is in-
creased. Switch
REFLECTOMETER
switch
to
REFL
(
reflected
power)
position.
If
the
value
of
reilected
power
is
more than
5%
of the forward power, the
ex-
ternal
transmission
Iine and antenna shou
Id
be
checked before proceeding further.
11
.
0perate
POWER
OUTPUT
control in RAISE positi
on
Jntil
the
PA
total
plate
input concurs approxi
mately
w:
th those
calculated
f
or
proper
operating
level.
12. Check
IP
.A operating parameters in the various per-
tinent
MUL
Ti
METER
positi
ons.
Ty
pical
operating
parameters for the !pa stage
at
various
transmitter
output
levels
are:
TABLE
II
Transmitter
Output
Levels:
3.5
4.5 5.0 5.5
KW
-IPA
Plate
Voltage
: 2.0 2.0 2.0 2.0
KV
IPA 1 Cathode
Current: 170 180 190 200
milliamperes
IPA2
Cathode
Current: 170 180 190 200
mi
IIiamperes
IPAGrid
Current: 20
20
20 20
mi
11
iamperes
IPA Grid
Voltage
: -87 -87 -87 -87
Volts
!PA Screen
V
oltage
:• 150 150 150 150
Volts
IPAScreen
Current: 15
10
10 5
mi
11
iamperes
•The
setting
of
the POWER
OUTPUT
control
establ
ishes
this
voltage.
3.6
FINAL
TUNE-UP
PROCEDURE
For
optimum overall o
perating
efficiency
upon completion
of
the
initial
tune-up,
readjust
IPA tuning and loading
unti
I the
operating
parameters
of
the Ipa stage
approxi-
mate the
values
shown in
TABLE
II.
Adjust
PA
TUNE
and
PA
LOP..D
controls
to
produce the
calcu
lated
PLATE
V
OLTAGE
and
PLATE
CURRENT
v
alues
required to produce the necessary
transmitter
power
output.
Plate
voltage
may
be
increased
or
de-
creased
by
moving primary power connections located
on
the power transformer terminal
block.
These may
be
changed in
10%
steps
by
t
his
procedure.
IV.
OPERATION
The
daily
operation
of
the
BF-5K
is
straightforward.
Start-up procedure
is
as
fol l
ows:
1. The
circuit
breaker
switches
at
the l
eft
hand
side
of
the horizontal ledge
just
below the
exciter
panel
should
be
kept
in t
heir
ON
posit
ions for normal operas
tion. (These are
protective
devices
and.are placed in
their
OFF
positions
only
for
safety
and convenience
during maintenance _and
servicing
of
the transmitter).
2. Depress
START
button.
(ST
ART
button iIluminated)
(AIR
i
ndicator
illuminated
)
(
Fl
L
indicator
iIluminated)
(BIAS i
ndicator
i
lluminated
)
(28 Vac
indicator
ill
um
inated)
3.
After
a ti
me
de!
ay
(
adjustable
approximateiy 30
seconds to 2 minutes
by
knob
sett
ing
of
delay
re
lay
K-6), the
PLATE
OFF
pushbutton wi ll
be
il
luminated.
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MC
Martin.
4. Depress
PLATE
ON
button
(PLATE
ON
button
illuminated).
(PLATE
OFF
button
extinguished).
Nonna! shut-down procedure
is
as
follows:
1. Depress STOP pushbutton.
The
BF-3.SK wiII shut-down
completely,
in the proper
sequence.
First,
the power
wi
II
be
removed from alI
portions
of
the
transmitter
except
the
cabinet
blower.
After
approximately
2 minutes,
this
blower
will
be
turned
off,
completing
the shut-down.
If
during
tune-up,
or
routine
maintenance schedules,
only
the
PA
plate
voltage
is
to be removed,
depressing
the
PLATE
OFF
pushbutton performs
this
function.
Fi
laments,
exciter,
etc.,
remain
on.
V.
DETAILED
CIRCUIT
DESCRIPTION
Reference to
cited
drawings
will
be
helpful
in under-
standing
the fol
lowing:
5.1
B-910 EXCIT'ER
Refer to
Appendix
A,
"Section
IV"
(pages 4 through 11)
of
the
8-910
Instruction
Manual.
5.2
11:'A
STAGE (Ref: Cwg. #000270/1)
The
RF
output
of
the 8-910
exciter
is
fed
to
the IPA
stage
by
means
of
SO-ohm
coaxial
transmission
cable.
An
RF
matching
network
comprised
of
c-12.
C-15 (IPA GRID
control)
and L-21 provides impedance transformation
between the
exciter
and the
control
grids
of
the
parallel-
connected
4CX2508
IPA power tubes.
Fixed
grid-bias
for
the
IPA
stage
is
fed from a separate power
supply.
Ad-
ditional
operating
grid
bias
is
provided by the
voltage
drop through R-13 and R-15 generated
by
IPA
grid
curren_
t.
The
grid
voltage
is
sampled through R-14 and A-48
1n
parallel
for a
MULTIMETER
reading
in the IPA GRID
CURRENTposition
of
theMUL
TIMETER
selector
~witch.
The
filament
voltage
for the two
4CX2508
tubes
1s
pro-
vided by
T-3.
The primary
winding
of
T-3
incorporates
AF
filtering
L-5
and
L-6
in
conjunction
with
C-8 and
C-9.
Actual
filament
operating
voltage
is
determined by
the
setting
of
the front panel
Fl
L
ADJUST
control.
R-9
and R-10 are
mechanically
ganged
with
a
similar
rheo-
stat
control
for the IPAand
PA
stage-tube
filaments.
The
individual
cathodes
of
the
IPA
tubes are
AF
by-passed
to ground. Series
resistors
A-17 and R-20.in the cathode
to ground
circuitr/
generate a metering
voltage
1n
the
IPA-1/lPA-2
CATHODE
CURRENT
positions
of
the
MUL-
TIMETER
select
switch.
Precise
balance
of
these two
parameters
is
not
necessary; however,
disparities
in
excess
of
15%
will
usually
indicate
aging
of
one
of
the
tubes. Before replacement. however,
it
Is
recommended
that
the two tubes
in
use
be
interchanged in the
socket
positions.
If
this
procedure
indicates
that
lower
cathode
current
results
tor tne same tube,
it
should be replaced.
Plate
supply
voltage
for the IPA
is
provided from a
full-
wave bridge, center-tapped power
supply
which
also
pro-
vides
PA
plate
'
✓
Oltage.
The la~ter
voltage
is
obtained
from the
full-wave
bridge
rectifier
D-9 tnrough D-12
configuration·
therefore,
thedPAsupply,
fed from the
sec-
ondary cente'r tap
of
the
plate
transformer
provides
a
voltage
value
essentially
equal to
one-half
the
PA
plate
voltage
value.
The IPA supply
!S
filtered_ by a conven-
tional.
dual
choke/capacitance
filter,
consisting
of
L-19,
L-20
and
(;-~.
C-50. IPA
plate
voltage
is
metered in the
I
PA
PLATE
VOLTAGE
position
of
the
MULTIMETER
selector
switch.
:<-9
series-connected in the IPA cathode
ground return, serves as the I
PA
overl~ad
relay.
Screen-voltage for the paraIlet connected
4CX2508
tubes
is
obtained from the rotor
ot
the front panel POWER
AD-
12n1
JUST
potentiometer, A-7,
which
Is
motor-driven.
The
raise/tower
control
relays
K-11 .and K-13 are operated
from the front panel
RAISE/LOWER
control.
This
control
provides
extremely smooth control
of
the
transmitter
power
output
level
from
essentially
zero
to
full
power
output.
The lf>A SCREEN
VOLTAGE
is
metered
in_
the
appropriate
position
ot the
MULTIMETER
switch.
The
plates
ot the
4CX2508
IPA
tubes are.
parallel-
connected
with
de
plate
voltage
fed through
L-7,
the
plate
RF
choke. C-32 and c~33 serve as
RF
coupling/
plate
blocking
capacitors.
A
pi-L
network comprised
of
C-34 (,IPA
TUNE),
C-36 (IPA-
LOAD),
L-9
and
L-10
provide
proper impedance transformation for
coupling
the
RF
power from the
IPA
stage
to
the ti lament
of
the
3CX3000/
A7
PA
output
stage.
·
5.3 PA STAGE (Ref: Cwg. #000258)
L-11 and
L-12
(of open
line
configuration)
connected in
each leg
of
the
filament
supply operate
as
AF
chokes
to
maintain
the fllament
at
RF
potential.
The end
of
the
lines
opposite
the filaments are maintained
at
RF
ground
potential·by
C-39 through C-42.
Filament
voltage
is
ob-
·
tained
from T-2. The
filament
voltage
of
the
PA
tube
is
continuously
metered by the panel-mounted
FILAMENT
VOLTAGE
METER.
This
voltac;e should
be
maintained
at
7.5
volts
to
insure
maximum
tube
life.
The front panel
FILAMENT
ADJUST
control permits maintenance
of
the
prescribed
filament
operating
voltage.
The
FIL
ADJUST
control
operates R-9, which
is
a
series-resistance
ele-
ment
in
the
primary
of
T-2.
The
grid
of
the
PA
tube
is
operated
at
both
de
and
RF
ground
potential.
A small amount
of
fixed
bias voltage
is
generated
by
the cathode
(filament)
resistors
A-39
and A-40 in the centertap ground return
of
T-2. The
voltage
drop across one
of
these
resistors,
R-39 appears
across K-8, the
PA
plate
overload relay, the
sensitivity
of
which
is adjusted by the
slider
tap
position
on R-39.
This
is
normally
adjusted so that the overload ralay
wiII operate when PA
plate
current exceeds
15%
of
its
normal
value
at
the .
various
power output
levels.
R-41
develops
a
voltage
drop sample tor remote metering
of
PA
plate
current.
The
PA
plate
tank
consists
of
a shunt shorted-
li
ne
:::::;:
c·/l
:~~
t:
L~AND~
~~~
to~~r~:~et~~e1~~~
and PA
LOAD
controls
provide mechanical
drives
for the
positioning
of
the
shorting
bar
on
L-15
and
L-16.
respec-
tively.
Capacitor,
L-23
is
a shunt-connected i
nductor
which
selects
the tank
circuit,
so as to
provide
a
nominally
50-<ihm source impedance to the
RF
harmonic
filter
input
port.
The
AF
harmonic
filter,
of
low-pass con-
figuration,
provides a minimum of 65
dB
attenuation
of
all
frequencies
above the fundamental
operating
fre-
quency.
A front panel
REFLECTOMETEA
permits continuous
metering
of
either
.
relative
forward
or
reverse power,
by means
of
a panel-mounted
selector
switch.
5.4
CONTROL
LACOER/OVERLOAC
PROTECTfON
(Ref:
Main
Schematic
#000270;Overtoad
Protection
Assy.
Schematic
lt550209/'1)
Operation
of
the main
circuit
breakers,
C81,
2, 3 located
on tne
lower
panel of the
transmitter,
connects the
pri-
mary power
service
to the 8F-5i< system.
When
the Power Supply
is
energized
by
operation of the
circuit
breakers,
28
vac
appears
on
TB-103, t
&
2 and
28
Vdc
on
TB-103/3.
These voltages operate the various
control
ladder
functions.
7
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.....
-----
24VOC
j_STOP
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______
____,.!
120
S!C
TO
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ll!LAY
I
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Fil. oir,r l.lGHT
----*--------------------
...
0
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◊
~OW!R
I
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TO
1
15VAC
OR
220VAC
0
I
:
~
Fil.
R!LAY
...
---
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AIR---r--~q
,-
--------------------------
➔
i
l~Tt1'LOCX
4.IR
INOICATOR •
2)
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Sl!C
:0
F'IL
'MA"M
UP
!
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lt!:MOT!:
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K11
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TRANSFORMt:l't
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ASSY
AGURE
4 • SlMP'...J
FlED
CONT'ROL
ClRCUIT
DIAGRAM
241/AC
l'--0
-----------
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IMC
Martin.
I
I
I
I
+28
Vdc
is
fed to the Control Ladder Assembly through
TB-0 • 1, energizing K-3, a two-minute_ time
delay
relay.
(Note that in a remote control operation
w~~ire
al
_I
prl•
mary
circuit
breakers would normally
be
left
1n
their
ON
positions,
the coi I
of
K--3
is
energized through the nor•
mally-closed
5/6
contacts
cit
K-1
during the standby
off•
air
period). Normally-closed
contacts
117
of
K-0 energize
the
FAN/Fl
L contactor
K--3,
starting
the blowers.
A momentary closure
of
START
switch
energizes
START
relay, K-1. Contacts
of
K-1
initiate
-the
following
func•
tlons:
1. Contacts
9/10
latch
K•1
in
its
ON
position.
2.
Contacts
5/6
open~
defeating K-3, the two-minute
delay
FAN/FIL
·sHUTDOWW
relay.
3. Contacts
6/7
close,
supplying
28 Vdc to the balance
of
the Control Ladder Assembly
circuits,
as
well
as
START
indicator
lamp.
As the blowers
start,
the
air
flow
pressure sensor
switch
closes.
These closures tum
on
the AIR
indicator
lamp,
and
energize the colI·
of
relay K-5 the
Fl
LAMENT
con;
.
trol
relay,
closing
contacts
6/9
and
4/7
of
K-5. The
6/9
closure energizes
T·2
the PA
filament
transformer.
The simultaneous
4/7
contact
closure
of
K-5
applies
28
Vdc to the
•plate
ready•
timing/control
circuitry
con-
sisting
of Q-1, Q-2, and K-4. The time
delay
of K-4
operation
is
determined
by
the approximately 15-second
time constant
of
the
RC
combination, R-2 (82K-ohms)
and
C-2
(47
mfd). As the
4/7
contact
closure
occurs,
C-2 begins
to
charge through R-2 and the base-emitter
junction resistance of Q-1.
This
charging ·current main•
tains
Q-1
in
its
•on•
state,
which through the
voltag,¾
drop produced
by
Q-1
collector
current through R·3, keeps
a-2
•ow
by
holding
Q-2 base voltage
close
to the
a-2
grounded~i
tter
value.
When
C-2 reaches the nominal
+28
volt
value,
Q-1
base and
collector
current ceases,
increasing
Q-2
base voltage
and
collector
current, ener•
gizlng
K-4 series connected in the Q-2
collector
circuit.
The K-4 operation
closes
contacts
9/10.
If
the rear
door is secured, the
interlock
switch
is
closed. The
thermal
switch
is
a 250° F sensor located in the output
air
plenum
of
the PA stage
and
is
norm:11ly
closed.
Thus
+28 Vdc is fed through the
9/10
contacts of K-4,
and
7.
This
energizes
INTERLOCK
indicator,
LM--3
and
through
normally-closed
contacts
14/15
of
K-7,
the
PLATE
OFF
i
ndicator
lamp.
When
K-7, the
PLATE
ON
relay,
is
energized
by
a
mom•
entary closure
of
the
PLATE
ON
switch,
the
following
occur:
1.
K-7
is
latched
•on•
by
contacts
12/13.
2. Contacts
14/15
open,
extinguishing
PLATE
OFF
indicator lamp.
3. Contacts
15/16
close,
energizing
PLATE
ON
indica-
tor lamp.
4, Contacts
9/10
close,
applying
+28
Vdc through the
Overload Protection Assembly to the
c,:,i
I of relay
K-10, (The plate contactor)
S.S
POWER
SUPP\.
Y (Ref: Dwg. #000258)
Plate
voltages for
both
the PA
and
. IPA stages are pro-
vided
"oy
a
single
power supply, which
will
have
either
single-
or
three-phase primary power source; as ordered.
The
primary
winding
of
the
plate
transformer, T-1,
is
designed to provide secondary voltages
of
4
KV
or
5 KV,
!10%,
at
three
basic
input
line
voltage
values
of
208,
220
or
240
vac.
These primary
winding
taps permit
18
selections
of
transformer secondary voltages
by
use
of
the appropriate primary taps.
The
secondary center tapped
winding
feeds a
full
wave
bridge
silicon
rectifier
stack
consisting
of
D-9 through
D-12. The
rectified
PA high voltage
is
filtered
by
a dual
section
LC
filter
(L-17, L-18, C-47 and C-48). R-24
is
the bleeaer. load for the PA
plate
supply.
Plate
voltage
metering
is
provided
by
the front panel
PLATE
VOLT-
METER.
The meter
multiplier
resistor
string
for
this
meter
consists
of
R-30 through R-34.
The IPA
plate
voltage
is
derived
from
the center-tap
of
the
T-1
secondary winding and
is
filtered
by
L-19, L-20,
C-49 and C-50.
The IPA screen voltage
is
obtained from a combination
bias/screen
supply
consisting
of
T-4,
D-1
through D-4.
Fl
lterlng
of
the
positive
screen voltage
is
provided
by
L-1 and C-4. The screen voltage applied
to
the IPA screen
grids
is
adjusted
by
a front-panel, motor driven control,
R-7. Grid
bias
voltage for the IPA stage is derived from
the same
power
supply. The bias voltage is
filtered
by
R-4/R-5
and
C-3/C-5.
.
5,6
OVERLOAD
PROTECTION/STATUS
INOICATION
(Ref: Dwg.
#550209/1)
The Overload Protection Assembly provides the sensing
of
overload
conditions
in the
DRIVE
and PA stages
as
well
as abnormal
VSWR
load
conditions.
Relays K-18, K-19, K-20,
and
K-21
respectively
sense
VSWR
condition,
Exciter
phase
lock,
PA plate current
and
IPA
cathode current. The sampling voltages are pre-
set
to produce relay operation when the currents exceed
nonnal value
by
approximately 15%.
Note:
The
exciter
status
light
will
remain
on
when the transmitter
is
off,
if
the
exciter
is
operated from internal AC
from
the trans-
mitter.
The
LED
indicates
the
exciter
is
out
of
phase
lock
or
has been out of phase
lock.
When
an
overload
condition occurs so as
to
actuate K-18 through K-21, the
12/13
and
6/7
sets
of
contacts
ot
the appropriate relay
close.
The
6/7
contacts trigger the appropriate
SCA
(A-7 through Q-10). The front panel
light
emitting diode
(LED-1 through LED-4) is energized
when
its
associated
SCR
triggers
and
latches. The normally-closed secondary
contacts of the
PLATE
OFF
pushbutton,
SW-9A
interrupt
the anode returns
ot
0-7
through Q-10 providing manual
reset of
LED's
only
when
SW-9A
is
depressed.
The closure
of
any
of
the sets of
12/13
contacts applies
+28 Vdc to the balance of the time delay
switching
cir•
cuits
and simultaneously energizes K-17, opening normal-
ly-closed contact sets
8/9
and
14/15
across
TB~.
1 & 2.
As these contacts open, relay K-10, PA plate contactor is
deenergized taking the transmitter
off
the
air
by
removing
high-voltage from the
IPA
and
final
stage.
The control voltage for K-18 operation is provided
from
the
VSWR
Detector Assembly lDwg. 4550204/1 ). An
LM--322
(IC-1) is used as a non-inverting voltage compar-
ator. A sample of the
positive
reflected voltage
from
the
Reflectometer
is
fed
through terminal 5, through timing
network C-2, C-3, and
A-1
to
the
RIC
input of IC-1
(pin 5). The trigger voltage point for IC-1 is established
by
the
setting
of R-2.
Where
the •retlectedN
voltage
ex-
ceeds the pre-set value,
K-1
in the output
collector
cir-
cuitry
of IC-1 (pin
12)
is energized,
closing
the relay
contacts across terminals 6 and 8.
This
applies
+28
Vdc to relay K-18
of
the Overload Protection Assembly,
9
www.SteamPoweredRadio.Com
wntcn.
u
cplafned
aoove. removes
IPA
and
?A
l'ltgn
voltage.
fires
t.S0-1
and
a~lles
+28 Vdc
ta
tn•
balanc:a
of
tne
Ovwtolld
Protactton
Auembiy
tlrmnq
ei~lts.
A
one-nccn-a
time-
delay
drcuit
(0--.S.
a-..
and
K•t~l
Is
energind.
K-15
Is
14tened
•on•
by
its
12/1~
ecntacts
In
J«ies
witt'I K•16
e=itact3
8/9
and
tne
nonnaHy-elosed
0/t.
AESST
ecntacts
ot
tne.
PU
TS
ON
pu.shbJttcn.
swltdS.
After
~proximately
one see::nd.
!<•14
Is
energl%9d. lt:s
nonne.Jly-etcsad
ecntact3
81'9.
ui:cn opening.
deenergiu
K-17
Witldt
restcres
tne
Pt.A
Te
ON
i:endttJon.
stmuitanecusly,
ecntacts
9/10
of
1<•14
close. prepartng
the
0-1,
Q-2,.
K•t3
dfl:UU.
for
a seccnd
owrtoad
c:cncu-
tfon.
NO'Te
When
1<•15
we
energized
by
tne
lnitlal·
overload.
Its
ecntaets
9/10
energized
Ute
30-secaad ttmet'
circuitry
ca~.
0~.
and
K•16).
ihts
timer
will
clear tne system
If
I
no subsequent
overloads
oc::ur wttnin 30 seccnds after
the
Initial
overload
oc:euntnee.
If
a seccnd overtoaa does Indeed
o=ur
dunng
tne
30-
l
saecnd
~od.
K•18
again
cf~es.
Its
12/13
contacts
again apply +2S Vdc
.a
K•17,
remcvtng
l'late
\'01tages
and
tne
one-sec:md
ti!Mf'
cin:uit:s
(Q•t,
0•2.
K•12)
r~at
their
c-1cta.
ultimately
deem1rgt%ing
K•t7
again,
l
wnicn
rea~lles
hign
voltage
ta
tne
IPA,
ORIV5R
and
PA
stag9s.
,
If
a
tftiri::
avenoad
oc:cu~
witt'lln
me
30-seccnd
pertod.
I
K•t8
oi:ieran
. on
again
deenergl%ed K•17,
?facing
tne
transmittv
in
lt:s
FIU
ic
OFF
catdftJcn.. 28 Vdc wi
11
oe
aQ;,lhtd to K-11 tnrougtl c::ntact:s
9/10
of
K•14
and
CQft-
tact:s
9/ia
of
K•12.
Relay
K-n
tnrouc;h
Its
6/7
et:1nracts
'#tll
lat=
•on#
and
~ly
29
Vdc:
to K-17
tnrougn
it3
ontaet:s
12?'!3.
TIius
K•17
.,.,ill
~n
energi%9d
(PUTc
OFF et:1nditfon) unUI 011. RESST
swttdt
(Pt.ATS
OFF)
Is
rnanuai
ly
operated.
Irr
attar
ettner
a
first
or
sec=nd
overtc:ad. nc actdttfonal
~verfoad:s
oc::".sr,
en.
~ac::ind
timer
(Q~
Q-5.
K-18.)
'Nfll
autcmatJC311y
•e!ear-
me
system;
l'l0W9WI', tne
E
=c:iated
t..:0
indJC3t0r.
•f1red8
by the·
fault
et:1ndltfon.
II
remain on and
can
be
extfnguisned
only
by
manuat
Qetation
of
the Flt.A
1c
OFF
pu~blttcn
switdt.
I Vl. REMOTE CONTROL
eSF~--=K
is
ca~i•
of
interlacing
wun
standard
te
=ntrol
~terns..
AU interc::nnec:ttons
fOt'
central/
emetertn«;
are
mace
ta
ia•tt/'13.
Set
Ftgure
2..
9.1 SiAR1'-sTOP
FUHCil0N
I
ncnnally-o"en
ecntact closure
from
the remote
c::ntrol
system
sriould
ce
=nnectad
to
ra-i3
(1
& 2) wltt'I
tenni-
nat
!t1
as
canmon.
or
ground.
Momentary contact
closure.
lf,itfated
"='f
o"eration
of
U,e
remote
centrol
system-.
wUI
liitfats
u,e
START
cycle
of
tne
SF..si< •
A
nonnaHy-open centac:t.
ct~
w,rect
aC"Oss
tenninais
I
and 3
ot
Ta--13
will
initlata
tl'le STOP cycle·
of
u,e
F-3..Si<
wnen
a mcmentar/
closure
is
inltlat9d
r:v
tne
remote
a)ntrol
system.
l·j-1
i=urc
OH/OFl=
FUNcTtcNs
Plate
voltages to
all
tute.s
may
oe
switched.
on
or
off
tely,
wttneut
interruption
ot
lllament/'olower
cir-
itty.
lntenvirtng
ot
nonnally~pen
centact
closures
in
tne
remote
ccntrol
;ystem
to TE•11
(1
&
2) for
Pt.ATS
OFF
and TS-11
(1
& 3)
fOt'
Pl.ATS
ON
eentrol
(Terminal
lt1
is
ecmmon.
or
ground)
will
perlorm
these
tunct1ons
remotely
whenever
a m0mentary
closure
Is
Initiated
by
tne
1'1!ffl0ta
control
system.
SO:
~Wal
OUTPUT-AA15£/t.0We:I
RJNC1'10NS
A normally-o"en
a)ntact
cla:sure
fr0m
the
remote
control
system snould
be
wired
~s
Ta-,3(1
&.
S}. Tenninal
1#1
Is
..
common•·,
or
ground.
Closure
ot
these <:t:lntacu •
implemented
by
operation .
ot
tne
remcte
controlsystem:-
wrn
energize tne
l~A.sc.,en
veltage
mct0t'~riv11n
e0ntrol
· ..ms.'"
relay,
K•12
as
long
as
tne closure
is
main-
tained. This
wt
U
:RAISE
me
6F-3
•
.SK
power
outpUt.
A ncrmally-open
ecntact
closure
from
the
remote
ecntrol
system sn0utd
be
.
wired
across
TB-1::3(1
&.
6)
w1t1,
Ter•
minal
111.
••C0fflmcn'•
or
ground.
Closure
of
tttese
c:::n-
tac:t:s.
l~lemented
by
ocieratton
ot
tne remcte CQntrol
s~tem,
wlll
energi%e
tne
IPA
scte11n
voltage
motor•
driven
00ntrol
..
lower•
relay, K•13 as long as tne
clo•
sure
is
maintained.
This
will
l.OWeR tne
9F-5K
l'Qwer
output.
8.l
ME1"EnlNG FUNCTIONS
P~sit1V8"1)01arity
samples
voltage
tor remote
metering
ot
tne
Fl
A
operating
paramea,r3 aoi:ear
on
ra-1
z.
e.3-1 Remow
?A
Plate
VoUaqe
A
voltage sarm,le
ot
tnft
PA
;,late
voltage.
appears
ac:t0~
ra-13<1
&
n.
Tenninal
/11
is
n991tive
anci
Terminal #7
is
posttlve.
tor
intete0nnect10n to remate
contrOI
system
telemetry
ini;iua.
•
8.3-2
Aamot.
l'A
Ftata
Ourat
A
voltage
samole.
derived from ·tt'le
FIA
plate
cun"911t.
api:iears
ac.-oss
T'6•13(1 & 8). Tanninal
.¥1
is negative
and
.Terminal #8
Is
p0$ittve.
tor
Interconnection to remate
et:1ntrol system
telemetry ini;iut:s.
8..3-3 Forward/Reverse
Aetl~.Qnetar
Metaring
It
deslntd. eitner
tna
••reverse"
or
..
forward
..
~wer
in•
dfcarton
ot
the retlectcmeter
may
:e
metered
remotely.
If
..
reverse"
power
Is
to
oe
metered
remotaly,
operate
tne
fn:,nt
panel
REFl.S:CTOMeTcR
switc..,
in
FORWAAC
position.
Make
in~nnect!on
from
remote control sys-
tem
talemeter1ng Input to TS•l:3(3
&
4). Terminal
il:J
is
~ittw.
Terminal
/14
is ne1;3tlve.
If
..
forward••.
power
is
to be
metered
remotely
,
operate
tna front panel
RErt..SCTCM.eTcR
switett
in
REVERSc
posl
tton. Make
lnten:cnnec:t1on
tor
remote
centre
I
system
tetemeuy
lns:ut
to
TS-14(1
&
2). TanninaJ
tn7'i
positlve.
Terminal n
is
negative.
NOTS!
It
tna
REFt.=CTOMeTcR
reading
is
metered
rem::,t1Uy,
as desc:ibed
acove.
tne· reaciing
of
tne trans-
mitter
met8t'
wi
II
Rot
be correct unless tne pertinent
positive lead ca,nec:t1on a-3
dasc:ribed
acove
Is
removed
fl'0fflT'6-14.
vn.
MA,NicNANCS
RoutJne l'!ou.sekeeQing
prac:lca
in
/(~ing
tne caoinet
enc:!o.sure and ttta Internal PA and IPA
ccm;:arcment
areas
free
ot
dust
anci
dirt
will
contrtbute
to
many
years
ot
servica
from
me
·
8F-oi< •
C.W"nON:
Pf;tOR
TO
l=E.~F~RMING
'HOAK
'
Hf
THIN Ti-IE
C.ASINE1"
AREA,
SWliOi
OFi=
n!ONT
?ANE!..
cf;:i.
C1JJT
BREAKa:tS
ANO
OISEN~Gc'.
,U.J..
FRIMARY
ss;v1cs
swtiOiS
OR
SREAKS::=IS.
www.SteamPoweredRadio.Com
CMartin.
USING
THE
GROUNDING
STICK
PROVIDED.
DIS•
I
HARGE
ALL.
FlL
TER
CAPACITORS
SEFORE
START•
NG WORK.
Al.
THOUGH ALL. HIGH
VOLTAGE
POWER
UPPLIES
ARE
EQUIPPED
WITH
BLEEDER
RESIS•
TORS
ANO
THE
HIGH·
VOLTAGE
POWER
SUPPLY
IS
r:
UTOMATICALL.Y
SHORTED
TO
GROUND WHEN
THE
REAR
COOR
IS
OPENED.
FOLL.OWING
THE
ABOVE
ROCEOURE
COULD
SAVE
YOUR
LIFE.
MAKE
THIS
PROCEDURE
A
"HABIT"!
I.A.1thougt1
dust
accumulation
within
tt'!e
PA
and
rP~
com-
lpartments
will
be
minimal
due to
positive
cabinet
pres-
sure
during
blower
operation,
it
is
recommended
that
at
intervals
of
no
less
than 30
days,
this
area and
all
inter-
l
al
surfaces
and components
within
the
cabinet
be
wiped
own
with
a
clean,
I
int-free
cloth.
Collect
any accumu-
lation
of
wiped-down
dirt
or
dust
with
a vacuum
cleaner.
l:rhe dual
intake
Ii
lters
mounted on the
rear
door are
of
he
maintainabla
type.
Visual
inspection
of
the
filters
hrough the gri I
le
covers
wi
II
indicate
the
presence
of
dust
accumulation
on the
filter
grids.
Remove the
cap-
li
ve
fasteners
at
the top and bottom
of
each
grille.
The
ti
I
ter
element
may then be removed for
cleaning.
This
may be ·done
during
normal
transmitter
operation.
as
baffle
plates
on
the i
nside
of
the door prevent the fi Iters
from
contacting
any
of
the i
n,emal
components or
wiring.
A
11
drive
motors,
blowers
and fans are
of
the permanent-
ly
lubricated
type
and require no
service.
All
relay
contact
closures
are
of
the
wiping
type and
protected
by
covers.
Contact
bumishing
is
not
r
equired.
Semi-annually,
the
IPA
and
PA
tubes should be remov~d
from
their
respective
sockets.
Using
a
soft
brush, remove
dust
accumulation
around the
socket
areas.
It
is
recommended
that
the
cabinet
outer
surfaces
be
kept
clean
of
finger
marks by
cleaning
periodically
with
a
mi
Id
detergent.
Meter faces and the front
plexiglass
panels
should
be
gently
wiped
clean
using
standard
pIexigIass
cleaner
or
a
mild
detergent.
Use a
clean,
soft
cloth.
I
I
Vlll.
PARTS
LIST
A large number
of
the components are
of
standard
values
and
tolerances
generally
a'
✓
ai
lab
le
through
local
electronics
parts
suppliers.
Those
ot
unusual
values
or
tolerances
are
listed
below
;
Reier
to
APPENDLX
A
tor
parts
information
on
components
utilized
in the
8-910
Exciter
portion
ct
ttie
SF-3
•.:K
transmitter.
Symbol
I
c-12
C·15
C-23, C-44
I
C-24, C-32, C-33,
C-37, C-38
C·30,
C-31
cs
4
IC-34
C.-36
IC-43
C-47, C-48
C-49. C-50
1
D-1
to D-4,
0-13
to
D-16
'
0-5
to D-8, ·
0-9
to D-12
IL-1
L-17,
L-18
1..-19
IL-20
I
I
R-1
R-4, R-5,
;:;-3
R-i'
R-;
1.,
,
..,..
Part Number
660033
660047
660042
658963
5500n
660043
660041
660046
660044
660045
210008
210010
210016
928960
935035
931010
931011
700054
700058
700059
700060
700061
7C0062
533005
535009
404001
404002
Cescrlptlon
Capacitor,
variable,
55-300
pf
Capacitor,
variable,
6.5-50 pf
(I
PA
grid)
Capacitor,
200 pf,
7.5
KV
Capacitor,
1000
pf,
5
KV
Caoacitor,
mica
.001
mt,
2
KV
Capacitor,
variable,
9-38 pf, 4.5
KV
(IPAtune)
Capacitor,
variable,
50
pt (I PA lead)
Capacitor,
feed through: 1000 pf,
10
KV
Capacitor,
6
MF
/ 5
KV
MYLAR
Capacitor,
8
mf/3
KV
MYLAR
Diode.
Rectifier,
Type
1N4006
Diode,
Rectifier,
Type
1N40111
(Control
Voltage
Supply)
Diode,
Rectifier.
RS-3.5-24-12S
(High
Voltage
Supply)
Choke, 9
Henry
Clioke,
fi I
ter
reactor;
10
Hy:
1.
75 A
ctc
Choke,
swinging
4·2·::l
Hy:
550
mA.
Choke. 8
Hy;
550
mA.
Meter
and lens kit
0-5/0·10
scale
(
Multimeter)
Meter
and lens
kit
0-300
vac
scale
(Lin
e
Volt
age)
Meter
and lens
kit
0-10
va
c
scale
(F
il.
\/olt
age1
Meter
and lens
kit
0-2
sc:;1.le
(
40
di'
✓)
(P.~
Plate
Current)
Meter
and lens
~it
0-5
scale
(
50
div)
(PA
Plate
'iolt
agej
Meter,
elapsed
time.
Resistor,
bathtub;
2.5 ohms,
5-W,
10%
Ro=sistor,
tubuiar;
3 K ohms,
10
w.
10'½
Resistor,
,
,ariab!e;
7.5
Kohm:
25
'N
Resistor,
variable;
15 chm: 1
50
W
11
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I
I
I
I
I
I
I
I
I
I
I,
.,
Symbol
R-10
R-11
R-13, R-15
R-16, R-19
R-17,
FViO
R-18, R-21
R-22
R-23
R-24 R•24A
R-25 to R-34,
R-42
to
R-45
R-36
R-39
R-10,
to
R-4
i
R47
T-i
T-2
i"-3
1•..t
T-3
Z-1
Z-2.
z
..
3,
z
..
4
-
:-<;o
a,,
03,
as
C2.
C<1,Q5
07,
010
01 •
010
R1, R4,
R7
RZ,
RS
R
11,
;
=113,
R
15,
;:;
li
,=no, ,
:::i
1
2.
Ru,
R1s
C2.
C4,
ca.
C
iO
Cl,
w,
C.5,
C11, : 12
K ~
7,
K
11
, :
-<:
!
2.
:-<1
:,
:
-<
1
J.,
:<
i
::.
K1
6,
~
~
9,
:
-<.:o
,
:
-<21
PARTS
LJST,
continued
Part
Number
40AG03
402004
533010
404004
533024
4020C6 ·
539CO~
539006
540101
505183
539007
539004
540107
539005
920036
9~CC37
92C03S
90COi3
918965
220039
220011
897324
149012
149013
149015
897315
397323
897319
897320
897321
897310
Description
Resis-:or,
variable;
80 chm,
25
·,•,
Resistor,
variable,
2.5
Kohm,
2 '
,'/
Resistor,
bathtub;
47
chm, 5
W,
1G%
Resistor,
variable;
50
ohms, 25
'N
Resistor,
bathtub;
0.27
c~m.
5
W,
2'J%
Resistor,
variable:
250 ohms,
2W
Resistor,
tubular,
adj.:
100 ohm, 100 w
Resistor,
tubular:
50
Kohm,
225 '
.'/
Resistor,
tubular;
!CO
Kohm
225 W
Resistor;
; megohm, 4
W,
i%
Resistor,
tubular,
.ldj.:
10 ohm, 100
';'/
Resistor,
tubular;
ad
j.: 5 chm, 175 W
R.
esistor.
tub·.:lar,
adj.:
10
chm.
50
w
Resistor,
iubular,
:dj.;
:0
chm, 225
'.
'i
Ti~nstcrrr:er, Hi<;~•\
1olra;e
,
::,
!.
~~a
suc;
:y
Trar.stormer,
p.;
=:i.;
i.5
'l ac,
::."7"
.;
51
A
Transformer. :
FA
.=i:
.;
~
•
.J
\/ ac; 5
...;
Transtor.:ier,
scree!'l/ t ias
su::1y
Transformer, ccr:trcl
voi
ra<;
.g
st.:
_
:q
!y
U~l-2'.:C )
Diode,
Z:ner,
Tyoe iNJ:3~00
Diede,
Zener
,
24'
✓
PA
line,
shorting
::ar
assy.
Right
angle
dri',e
ass,.
Sproc:-:et, lad.::er c:,ain
Ladder
chain
Cabinet
exhaust
f
an
Cabinet
centrifugal
biower
Circi.;it
breaker, M.12-
..
;a.,.;.35.3
Circuit
breaker,
,.;,\:2
.,i
_3.,.;-5..,a
Ci
rcuit
breeker
,
,.1,.,1,11
-AS-;l..
-2-3
Motor, can
trol.
with
.::rai<e
Contac:ar,
60A
OVEF\LOAO
PROTECTJON
ASSC::,13LY
20'1022
201056
201109
210008
502104
502098
502056
502129
502130
5
12
CO::l
64CC03
T;ansistor,
s21cc
1
Transi
star,
2;~.'.3~c9
sc;::.
c,o::i
Diode,
IN~004
Resistor,
5%,
\
'2
W,
4.7K
Resister,
5l!J,
1
.
1
1
'N,
2.7K
Resis:or,
5J
:
o,
'.·
':
W,
J.7
onr..s
Resistor.
5:.·J,
'.-':
'.
'I,
J.7i<
Resister,
5~j,
1
.'
1 ,N.
:ct<:
Resistor,
~?l,
~'l
'
N,
i •
.::<
Cacac:
:er,
.01
:G
C'
✓
Ca~aci
tcr
,
47
µi=
:s
v
F.
alay
z:.
v
2C
www.SteamPoweredRadio.Com
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I
IVICMARTIN
WARRANTY
McMartin products are warranted to
be
free from defects
in
materials and
workmanship for a period
of
one year after shipping date, when subjected to
nor-
mal usage and service. All warranties are void if
(a)
equipment has
been
altered
or repaired by others without McMartin's specific prior authorization; or
(b)
equip-
ment is operated under environmental conditions or circumstances other than
those specifically described
in
McMartin literature or instruction manuals.
Upon notification within the applicable warranty period, McMartin agrees
without charge, to repair, replace, or supply replacement parts for any properly
maintained equipment or parts that are defective as to design, materials or
workmanship and that are returned
in
accordance with McMartin's instructions
to the Buyer. At McMartin's sole discretion, the Buyer may
be
requested to return
the defective part or equipment to McMartin, FOB Omaha, Nebraska. Parts or
equipment may be returned only with McMartin's priorauthorization and must
be
identified
by
a return authorization number previously issued
by
McMartin's
Customer Service Department. All merchandise so returned must
be
sent
transportation prepaid, at Buyer's risk. Full details
of
the failure or malfunction
should
be
included so as to expedite repair or replacement. Repair parts or
repaired or replaced equipment will
be
returned to the Buyer, FOB factory.
The above warranty does not extend to other equipment, such as tubes, tran-
sistors, I.C.'s lamps or fuses manufactured by others, which are subject to only
such adjustment as McMartin may obtain from the suppliers thereof. McMartin
shall not
be
liable for consequent damages resulting from the use of, or the
inability to use, the equipment; nor for any loss, damage or expense incurred
thereby; nor from any other cause.
Except as set forth herein, and except as to title, there are no warranties, or any
affirmations
of
fact or promises by McMartin, with reference to the equipment, or
to merchantability, fitness, for particular application, signal coverage, infringe-
ment, orotherwise, which extend beyond the description
of
the equipment
on
the
face hereof.
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IX.
SCHEMATlC
DIAGRAMS
OVERLOAD
PF=!OTECT!ON P/N55O2O9
/"1
VSWR
DETECTOR
P
/N
550204/1
MASTER
SCHEMATlC
P
/NOOO27O
Fl
LAMENT
T'RANSFORMER P /N92OO37
RECT!FlEF,
TRANSFORMEF1 P/ N918972
(single
phase)
P/N918973
(30 phase)
"'
folded
blueprint
page
15
16
17
13
www.SteamPoweredRadio.Com
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Singl
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MASTER
SCHEMATIC
000270
July
24
,
1981
..
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