Marti RPT-25 User manual

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MARTI E\.ECTIWNICS, INC
P.O. Box G61
1501 N. Mo ln SL reet
Cleburne, Texas 76 0 31
HPT-2 5
TRANSMITTF.R
I
WARRANTY:
Exceiat 01 ot'-wi,e provided In tni• 1ect,on, t he equipmonl d,ncribod heroin i, ,old under tho following
guor•ntoe,
Marti ogreos to repoir or replace wit hon a en• (l) yoor pe,lod and without charge, ony oquipmen! or
ports which are olofective 01 lo wo~,nonshlp or mo!orlol ancl which ort1 returned to Marti o! ih factory,
lrctnsportotion
prepaid ond properly lnaurod, provided,
{o) Notice of the clol,ned defect it given Mortl within one (1) year from dote appearing on invoice and
goods ore returned in accordonco wi1h Marti in1truction1.
(b) Equ i pment, occeuorle s, tub .. and ba11erie1 nol marwfoctured by Marti aro subject 10 only ,uch od-
ju1tmenh 01 Marti may obtain from the 1upplior lheroof.
(c) Equipment or occeuorles 1holl not bo deemed to kie defective if, ofter exominolion by Marti or
ill appointed repro,ontotlve, the equipment evitlence, domoge from moi1ture, Improper ha n-
dling, ln110ll01lon Of operation.
(d) In tho ovenl tho! Marti 11 required to demon11rate equipment capability either 01 to ,pecilicatlons
or dofec;t1 In part, er workman1h ip and whe ro it 11 found that tho equipmonl meeh 1pecification1,
Marti 1hall be entitled to collect oil AOsonablt upeme1 from the lluyer including but not limited
to,
travel, per di em living expen1e1 oi,d hourly wage rote, which have boon e1tabll1hed by Ma r ti
e1nd which oro in eAec1 at tho tlme.
Marti lurr+.or gvorantu, !hat ony radio lranomt"9< de1crlbed her ein will deli v er 1pecified radio frequency
power ou tput at the ontonno I.ad whon connocled to o 1ultable lood , but ,uch guaronteo sholl not be co n-
strved o, Q guoron!ee of any definite coverage « range of ,oid apporo!v,. Tho guoron ! ee of !he,e poro•
graph, i1 void If equipmem i1 altered or repolrod by other, ! hon Mart i or I ts outhorited M1rvice Repre-
1on!otive,
o, unleu ,pecif,colly ou!hoti%od Ii< writing by Marti. No other worron! l e, , e xpressed or impliod,
shall
be ofl,plicoblo lo •ny .qu i pment said herevndor, ond the foregoing ,hall con1!i!uto the Bu y er's ,a le
right ond remedy under th• Ggreem ents conlcJinttd i11 thi1 earagroph . In no oven! 1 hall Marti hove ony
liab ility f.or contequan!ial oomage,, or for 1011, clornoge or expen ,e directly or ind irectly ari ,ing from the
ute of the p,odvcll, or any inability lo UH ,1,.,.. oilher sepa r ately or in co m bination with other equ i pme nt
or
ma torlol1, or from °"Y o~r cause.

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RPT-25
REMOTE PICK UP TRANSMITTER
S.P-EC IF IC-AT IONS
Application---------------------- Broadcast Remote Pick Up.
Frequency--------- --------------- -450.001 - 455 .95 MHz .
Crystal Multiplication----------- 36.
MARTI ELECTRONICS
Cleburne, Texas
FrequeRcy Sta~ility-------~----- Portable/Mobile:+ ,0005% -30°C to +50°C. 1;'wo
(2) minutes are r;quired ~fter application of
stand-by power for the transmit ter to be in
toleranc€ when operated ~ortable-mobile at
temperature.5 below -10°C .
Base Station:+ .00025% -30°C to +50°C two (2)
minutes a.fter initial application of -st-and~hy
power.
Dual Frequ~mcy Oper • ation--------- Selectable dual freE!uency operation available
at eKtra cost.
Spurious Emission-- -------------- Spurious radiation attenuated more than 60 DB
below carrfer ley.el.
RF Output------------------------ Maximum 25 watts, nominal 20 watts into 50 ohms.
VSWR Protection------------------ High VSWR will not damage transmitter.
RF Connector--------------------- UG-58A/U.
Temperature Range---------------- -20°C to +45°C.
Modulation---- ---- ------------- -- Model
---
Deviation
Emission
RPT-25P 1.5 KHz,.
10F3
RPT-25N2 5
KHz. 25F3
RPT-25R 9 -KHz.
50F3
RPT-25S 22,5 KHz.
100F3
Audio
Inputs------ ,--- ---- -- --·---- Four - inputs are provided with individual mixing
· gain coatrels . three of the inputs are for micro-
phones (one push-to-talk) and one input accepts
balanced 600 ohm line.
Audio Input Leve l--- -- -- - ----- --- Microphon e input level can be from -70 DB to -45
DB, Line input level can be from -20 DBM to +4
DBM .
Audio Input Impedance------------ -Will accept microphones from 150 to 600 ohms.
Line input 600 ohms balanced,
Audio Connectors-·--------------- Inp ut No. 1 (XLR--4-31). Input Nos. 2, 3, and 4
(XLR-3-3 1).
Power Requirements-------·-------- 115/230 volts AC, 50/60 Hz., 155 watts transmitt-
ing, 30 watts standby. 13.6 volts DC negative
ground. 7 amp . transmitting, 0,5 amp. standby.
Modulation Control--------------- Marti CA-40 Compressor/Limiter Module. Selector
switch for measuring audio level, compressor gain
reduction, RF output, etc,
Weight--------------------------- 20 lbs. net, 26 lbs. gross .
Dimensions----------------------- 6-k" high by 15
11
wide by 12
11
deep.
NOTES: (1) Measured through 4 KHz . low pass audio filter.
(2) Pre-selector recommend ed when receiver is located near UHF transmitter.
(3) The extremely good sel ectivit y of this receiver results in some reduc-
tion of audio response and increased distortion , Ever increasiqg use
of UHF frequencies dem ands this selectivity in modern-receivers.

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SECTION
I
GENERAL
1.1
Marti
Model RPT-25
and
RPT-40
Solid
State
Transmitters
are
designed
to
operate
in
the
Remote
Pickup
Broadcast
service
as
defined
in
Part
74,
Subpart
D,
of
the
FCC
Rules
and
Regulations.
The
suffix
letter
of
the
transmitter
indicates
the
FCC
fre-
quency
group
it
is
designed
to
operate
on.
These
are
as
follow:
MODEL
NO.
FREQUENCY
MHz.
RPT-25P
450.01-455.95
RPT-25N2
450.01-455.95
RPT-25R
450.01-455.95
RPT-25S
450.01-455.95
RPT-40K
152,87-161.
76
RPT-40L
166.25-170.15
BANDWIDTH
10
25
50
100
30
25
KHz.
COMPANION
RECEIVER
R-30/450
R-
30/450
R-50/450
R-100/450
R-30/150
R-30/150
These
transmitters
when
used
with
the
recommended
companion
receiver,
provide
a
re-
mote
broadcast
link
having
audio
quality
not
approached
by
conventional
voice
com-
munication
radio
equipment.
NOTE:
These
Marti
Transmitters
can
be
used
with
older
tube-type
Marti
Receivers
by
positioning
a
special
"Response"
switch
provided
on
the
top
side
of
the
transmitter
chassis.
This
"Response"
switch
is
normally
factory
set
to
"DFM"
position
for
use
with
New
Solid
State
Receivers
by
placing
this
switch
in
"PH"
position,
the
RPT-25
will
operate
with
the
MR-100/450
and
the
RPT-40
will
operate
with
the
MR-30/150
Receiver.
The
"Response"
switch
is
accessible
by
removing
the
transmitter
top
cover.
The RPT-25
and
RPT-40
transmitters
operate
from
both
115/230
volt,
50-60
Hz.
AC
commerical
power
and
11
to
14
volt
battery
(Negative
ground)
supply.
Four
audio
input
channels
are
provided
with
individual
mixing
gain
controls.
A
meter
and
selector
switch
are
provided
for
monitoring
and
adjusting
various
trans-
mitter
stages
as
well
as
audio
VU
level
and
audio
gain
reduction.
The
solid
state
audio
processing
technique
pioneered
and
proven
by
Marti
Electronics
in
hundreds
of
remote
pickup
broadcast
transmitters
has
been
applied
to
these
models,
resulting
in
the
highest
quality
possible,
consistant
with
transmission
bandwidth
and
other
fac-
tors.

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.002
.002
ORANGE
I
OIA
018
0
IC·
CONNECTION FOR
115V.
OPERATION
R-SERIES
RECEIVERS
RED
ORANGE _BLACK
.002
01D
I
-BLACK
(TO
FUSE)
TO
CONVERT
FROM
U5
',(
IQ 230Y,;
I.
CUT JUMPER
FROM
A
TO
C.
2.
CUT JUMPER
FR
OM
BTO D.
3.
CONNECT JUMPER TO 8
AND
C.
4.
INSTALL
FUSE
OF
HALF THE
CURRENT
RATING USED
FOR
115
V.
'~
'
~
' ·1
z
'I
'---
.....
-t4§~a..
__
_
I I r---1.,_------11
]t-------c
1-------1r7
I I
I
OIA
_
BLACK
A.C. INPUT
018
0
IC
CONNECTION FOR
230
V.
OPERATION
01D
I
_
BLACK
(FUSE)
.002
DWG
.
NO.
700-110-2
MARTI
Glecir
onic:J,
Jnc.
115
V.
/
230
V.
CONVERSION
FOR
A-SERIES
RECEIVERS

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2.1
UNPACKING
AND
INSPECTING
SECTION
II
INSTALLATION
This
equipment
was
packed
and
delivered
to
the
carrier
with
utmost
care.
Do
not
accept
shipment
from
carrier
which
evidences
damage
or
shortage
until
the
carrier's
agent
endorses
a
statement
of
the
irregularity
on
the
face
of
the
car-
rier's
receipt.
Without
documentary
evidence,
a
claim
cannot
be
filed.
Unpack
equipment
immediately
upon
receipt
and
thoroughly
inspect
for
concealed
damage.
If
damage
is
discovered,
ceas~
further
uRpacking
and
request
immediate
inspection
by
local
agent
of
carrier.
A
written
report
of
the
agent's
findings,
with
his
signature
is
necessary
to
support
claim.
Check
your
shipment
against
the
shipping
papers
for
possible
shortagP
Do
not
discard
any
packing
material
until
all
items
are
accounted
for.
Small
items
are
thrown
away
with
packing
material.
2.2
PLACEMENT
OF
EQUIPMENT
Install
rack-mounted
equipment
in
a
well-ventilated,
well
grounded
and
shielded
rack
cabinet.
Do
not
locate
solid
state
equipment
in
a
rack
above
tube-
type
eq
uipment
which
produces
high
temperatures.
Problems
can
also
be
avoided
by
locating
this
unit
away
from
other
equip-
ment
which
has
transformers
that
produce
strong
magnetic
fields.
These
fields
can
induce
hum
and
noise
into
the
Marti
Equipment
thus
reducing
performance.
Also,
strong
radio
frequ
e
ncy
fields
should
be
avoided
where
possible,

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SECTION
II
INSTALLATION
CONTINUEDa
2.3
Mobile
Inatallation
of
R.PT-25
and llPT-40
A
typical
automativa
inatallation
la
shown on drawing 700-017-1.
The
transmitter
is
located
in
the
trunk
compartment and
is
remotely,
controlled
by
the
Marti
TPS-TC-1
control
unit
located
near
the
driver.
CAUTION,
Thia equipment
la
for
use
in
12.6
volt
naaative
around
vehicles
only.
Reverse
polar-
ity
will
instantly
destroy
tranaistors.
The
step-by-step
procedure
for
automative
in-
stallations
is••
follow•~
2.3,1
Mount
the
TPS-TC•l
control
unit
to
the
automobile
control
console
at
a
point
convenient
to
the
operator.
The
two
anal•
mountina
brackets
may
be used
as
attached
to
the
control
box
for
shippin&
or
turned
outw,rd,
depending on
available
mounti~~
apace.
Mount
the
two
bracket•
to
the
■
elected
mounting
surface
by
drilling
two 5/32
inch
diameter
hole
■
1pacad
either
5
inches
or
7
inches
apart,
depending upon method
selected,
Mount
the
two
anal•
bracket,
uaina
two
of
the
No.
10 x
3/4
inch
metal
tappina
acrewa
1upplied
with
the
TPS•TC•l
control
kit,
Attach
the
control
box
to
the
bracket
uaina
the
lwo
Hex-Head
No.
10
x;
inch
screws
supplied.
2.3.2
Attach
the
mountina
rack
part
No.
700-136
to
transmitter
using
the
quick-re-
lease
futenera.
Place
the
transmitter
in
th'e
trunk
compartment
at
a
place
where
it
is
eaaily
inatalled
and removed. Note
that
apace
is
required
at
each end
of
the
transmitter
for
oper~tion
of
the
rack
fastener,.
Alao
provide
spaGe
at
the
rear
of
the
tran1mitt1r
for
air
circulation
around
the
heat
aiuk
and
attachment
of
the
power,
antenna
and
r1c1iv1r
conn,ctora.
Whan
the
proper
location
ia
determined,
note
the
location
of
the
tranamittar
mountina
rack.
a,leaae
the
rack
fastener,
remove
the
tran1mitter
without
ahiftina
the
correct
location
of
the
rack
and mark
the
location
of the three
acrew
hol11
iq
the trunk
floor.
Before
drillin&
or
punching
these
holes,
lift
the
carpet
or
mat and determine
that
the
hole
locationa
will
not
damage
any
part
of
the
vehicle.
If
in
the
cl•ar,
drill
the
three
,/32
inch
diameter
holes
and
attach
the
rack
uaina
three
No.
10
x
3/4
inch
metal
tappina
screws.
2.3.2
Mount
the
Littl1fu1a
Circuit
Breaker
(15
amp
ratln&)
within
10
inches
of
the
po1itive
terminal
of
the
battery.
The
negative
terminal
of
the
battery
must
connect
to
the
chauh
or
frame
of
th1 v1hic,
la.
2,3.4
In1tall
cablta batwe1n c~
n~
,~t
ora
in
trunk
compartment and
control
box
and
bet•
ween
trunk
and
circuit
br11k1r
••
ih
own
on
drawina
700-017•1,
S~
Ja
r, •
~•
•dio a
nd
•~
cable
■
by
at
le11t
3
feat.

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INSTALLATION
CONTINUED:
2.3.5
Connect
the
red-White
No. 16
wire
from TPS-TC-1
box
to
the
"Accessory"
switch
of
the
vehicle.
2.
3
.6.
Connect
Black
No. 10
wire
from power
in
trunk
to
a good
electrical
(Bright
Metal)
ground
at
vehicle
chassis.
2.3
.7
Fasten
the
transmitter
to
the
rack
in
the
trunk
and
connect
the
XL-4-12C
four-pin
micrphone
plug
on
the
audio
cable
to
input
No.l
of
the
RPT-25
or
RPT-
40
transmitters.
2.3.8
Install
the
mobile
antenna
and
connect
to
antenna
connector
Jl
on
back
of
transmitter.
NOTE:
ALWAYS
MAKE
SURE
ANTENNA
IS
CONNECTED
BEFORE
POWER
IS
APPLIED
TO
TRANSMITTER.
2.3.9
Connect
the
Cannon GK-923-C-~
plug
on
the
remote
control
cable
to
the
mating
DC
power
receptacle
on
back
of
transmitter.
2.3.10
If
two-way
operation
is
desired
install
model FR-2527A
VHF/UHF
mobile
re-
ceiver
at
the
desired
place
under
the
vehicle
dash,
then
install
the
connecting
coax
cable
from
receiver
to
J3
(Receiver)
jack
located
on
back
of
transmitter.
Note
that
the
"BNC"
connector
end
of
cable
goes
to
the
receiver.
Both power and
antenna
are
supplied
to
the
receiver
through
the
cable.
2.3.11
Connect
the
short
red
No. 10
wire
from
the
Littlefuse
circuit
breaker
to
the
Positive
terminal
of
the
12
volt
vehicle
battery.
2.3.12
Plug
microphone
into
the
4-pin
microphone
connector
on
the
TPS-TC-1
control
unit.
The
installation
is
now
ready
for
testing.
Refer
to
Operating
Instructions
in
Section
111.
2.4
Connecting
Equipment
for
Stationery
Remote
Broadcast
Remote
Pickup
broadcasts
from
sporting
events
etc.
occurring
from a
stadium,
coliseum,
gymnasium
or
auditorium
involve
several
aspects
of
equipment
location.
The
transmitter
normally
is
located
near
the
announcer
or
engineer
to
permit
access
to
the
gain
controls,
monitoring
jack,
and
metering.
Availability
of
115
volt
AC
power
is
an
important
consideration
in
locating
the
transmitter.
For
115
volt
AC
operation,
use
the
special
AC
adapter
cable
supplied
with
your
transmitter.
The
cannon
9-pin
connector
plugs
into
the
DC
power
conn
ecto
r on
the
back
of
the
RPT-25
and RPT-40
transmitter.
CAUTION:
ALWAYS
MAKE
'1'HIS
CONNECTION
BEFORE
PLUGGING
INTO
115
VOLT
AC
OUTLET.

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CAUTION:
TO
PREVENT
ELECTRICAL
SHOCK
1
THE
ROUND
PIN
.
OP
THE
STANDARD
AC
PLUG
MUST
BE
CONNECTED
TO
A
PROPERLY
GllOUNDED
ELECTRICAL
OUTLET.
Some
station~
are
equipped
with
a Remote
Pickup
ba-se
ilatioa
foT ·
trafismisston
·
of
cues,
orders
and
instructions
.
to
the
remote
unit.

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INSTALLATION CONTINUED:
In such cases a VHF or UHF ~eceiva., s-uc-h as the Model FR-2527A is ccmnected to J3
receiver jack by means of the coaK cable supplied. This special cable supplies
both power and antenna to the - receiver.
2,4,l AUDIO INPUTS
The RPT-25 and RPT-40 tr&nsmitters provide four inputs and four independent mixing
gain controls. Input No. 1 is for push-to-talk microphone operation, and is wired
for the Marti MCD-70 microphone. The correct connector to plug into input no . l is
Cannon type XLP-4-12C.
Input No. l Connections ar~:
Pin 1 - Cable Shield (Ground)
Pin 2 - Microphone Signal (Ground)
Pin.... 3 - Microphone Signal
Pin 4 - Push-to-talk switch circuit (returns through shield ground)
The Transmit switch on the transmitter control - panel parallels the push-to-talk
switch in AC powered operation, eliminating the need to hold down the microphone
switch for long transmissions . Inputs 2 and 3 are microphone inputs ,* The correct
connector to plug into inputs 2 and 3 is Cannon type XL-3-12 .
Input 2 and 3 connections are:
Pin 1 - Cable Shield (Ground)
Pin 2 - Microphone signal (Ground)
Pin 3 - Microphone signal
* Input 3 is a microphone level input on standard RPT-25 and RPT-40 transmitters
which are ~qu~pped with the MA-3 module containing three 150 ohm input microphone
pre-amplifier. On special order, type MA-2/B module may be substituted, which con-
verts input 3 into a line level 600 ohm balanced input. Connections for input 3
then become the same as input 4,
Input 4 is a 600 ohm balanced line input. The correct connector to plug into
input 4 is Cannon type XL-3-120
Input 4 Connections are:
Pin 1 - Cable Shield (Ground)
Pin 2 - 600 ohm balanced line
Pin 3 - 600 ohm balanced line
(Input level -20 to +4 DBM)

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INSTALLATION
CONTINUED:
2.4.2
Monitor
Jack
Compressed
audio
from
all
inputs
c~n
be
monitored
at
~he
monitor
jack.
Use
a
standard
single
circuit
phone
~lug
with
headphones
having
an
inpedance
of
600 ohms
or
higher.
Audio
at
the
monitor
jack
is
unbalanc
ed
and
resistance
limited
to
prevent
loading
of
the
modulator
circuit.
2.4.3
Remote
Antenna
Installation:
The
success
of
a
remote
pickup
broadcast
depends
to
a
large
extent
upon
the
~ocation
of
the
remote
antenna.
For
short
distance
transmission
an
indoor
antenna
designed
for
the
transmitter
frequency
and
mounted
on
a
standard
5/8
inch
microphone
stand
will
be
sufficient.
For
suxh
operation
the
Marti.. PA-1
may
be
used
with
the
RPT-40
transmitter
.and
the
Marti
YC-450
or
YC-455
with
the
RPT-25
transmitter.
Locat
e
ind~or
antennas
away from
objects
which
may
~ffect
the
radiation
of
the
antenna.
Do
not
·
al1ow
personnel
to
come
near
to
or
touch
antenna
while
tr.ansmitting.
The PA-1
antenna
is
non-directional
but
the
YC-450
and
YC-455
are
extremely
directional
and
must
be po
inted
atreceivi~g
antenna.
All
remote
antennas
must
be
polarized
the
same
as
the
receiving
antennas.
For
transmissions
over
distance
greater
than
10
miles,
it
is
necessary
to
obtain
greater
remote
antenna
height
and
antenna
gain
(directivity)
. Tem-
porary
antenna
installation
can
be
quickly
made
in
ma~y
cases
by
use
of
a
telescoping
TV
antenna
tower.
The
average
distance
that
can
be
expected
from
the
Marti
RPT-40
transmitter
with
various
remote
and
receiving
antennas
is
listed
on
'
the
following
page:

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LITTEL FUSE
15
AMP.
r
CIRCUIT
BREAKER
NEGATIVE
GROUND
NO.
10
--
..
~
RED
WI
RE
0
OWG
700-017-1
"
RED-
WlfT.
N0
.16
WIRE
• TO
ACC.
SWITCH
¥
/2
TPS-
TC - I
rONTROL
UNIT
MARTI Gfec~.
.Jnc.
t
SEPARATE
J-T
LEAST
36
!
IICROPHONE
CABLE
API
SERI
8
AUTOMOTIVE
INSTALLAT
ION
BLACK
N
O.
10
'GROUND
WIRE

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AVERAGE COVERAGE OF MARTI ELECTRONI CS
REMOTE PICKUP TRANSMITTER S
OVER FLAT TERRAIN
RECEIVING
ANTENNA COMBINATIONS
CO VERA GE
IN M
IL ES
ANTENNA HEIGHT
Receiving
Transmitting
* 75 FT.
** 150 FT.
;'r 75 FT.
**
150 FT.
* 75
FT.
** 150
FT.
"' k 75 FT .
'i ' (-;'r
150 FT.
"i h'r
150 FT .
·ld,* 300 FT.
"k-1,
150 FT.
-l~k
300 FT .
CODE:
-1,
Measurement
based
80 feet.
-;' ("'J'(
Measurement
based
200 feet.
-. h'm
Measurement
based
350 feet.
on
on
on
5 element Yagi
5 element Yagi
Stacked 5 element
Yagi's
Stacked 5 element
Yagi's
5 element Yagi
5 element Yagi
Stacked 5 element
Yagi's
Stacked 5 element
Yagi's
RA-4 Ante nn a
RA-4
Antenna
RA-4 Antenna
RA-4 Ant e nna
Single Ring
Single Ring
Single Ring
Single Ring
5 element Yagi
5 element Yagi
5 element Yagi
5 element Yagi
Single Ring
Single Ring
5 element Yagi
5 element Ya gi
l e
ngth
of RG-8U transmission l i ne no t to exceed
length
of
~" FHJ4 transmission li ne n ot to exceed
length of
7/8"
FHJ5 transmission line not to exceed
9
13
11
15
14
18
16
20
14
16
20
N OTE: The RA-4 Antenna is not reco nnn ended on tower heights of l ess than 150 fee t
in height.
The above meas ur ements are based on a TRANSMITTING ANT ENNA HEIGHT of 6 feet
above surrounding objects. An increase in height of t he TRANSM I TTING ANTENNA
to 30 feet will increase the coverage by approximately 50 %. DON'T USE RG -5
BU; THERE IS TOO MUCH LOSS .
The ring antennas are non-direct io nal
are uni-directional. The gain of the
of a YC-Series Yagi antenna ta 9. 0db.
is 12.0 db. When using Ya gi antennas
Rotator .
within+ or - 3 db. The Yagi antennas
single ring ant enna is unity . The gain
The gain of Stac ked YC -S er ies Yagi Antenna s
for receiving, we r ecomme nd a standard TV Type

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SECTION III
OPERATING INSTRUCTIONS
3.1 CONTROL AND CONNECTbR FUNCTIONS
The Control Knobs numbered 1 through 4 are gain control and each independently
controls the leve l from an input on the left side of the transmitter having the
same number. The controls are mixing, which permits any combination of inputs
to be active.
The standard RPT-25 and RPT-40 transmitters are supplied with three microphone
inputs and one balanced line input. Inputs 1, 2, and 3 are microphone inputs
and input 4 is in the balanced line input. Input 3 can also be converted into a
balanced line input as explained in section 2.4,1 . Balanced line inputs are
used fo r cartridge tape machiµe inputs or other devices having a 600 ohm line
l evel output.
The rotary switch selects various circuits to be measured on the panel meter.
The meaning of the various meter selections will be covered later in this sec-
tion.
The rocker switch on the extreme right hand side of the control panel is the
power switch for 115 volt AC operation. In OFF position all power inside the
transmitter is OFF. In Standby position the audio section of the transmitter
is active, permitting the audio inputs, gain and associated equipment to be
checked out without transmitting a signal . The Monitor Jack is active in
Standby operation. When the power switch is placed in Transmit Position the
transmitter will deliver power to the antenna.
CAUTION:
Always make sure the antenna is connected to the transmitter (Jl) before
switching to Transmit.

www.SteamPoweredRadio.Com
Continued:
Connectors on the back of the transmitter are as follows:
Jl Connect to transmitting antenna .
J2 Connect to R-30/150 or R-50/450 receiver for transmit squelching
when usi.ng as a base station receiver.
J3 Connect to FR-2527A re~ote receiver (Optional) using special cable
supplied with receiver. This one cable supplies both power and
antenna to the re . ceiver.
J4 Frequency test jack for measurement of transmitter frequency .
Fl Fuse type 3AG
0
Slo-Blo
0 2~ amp.
This fuse protects transmitter
in AC operations .
F2
Fuse type 3AG 8 amp. This fuse protects transmitter in DC operation.
3. 2 MOBILE OPERATION:
Assuming the mobile installation to be made as per section 2.3, proceed as
follows~
3.2.1 Securely fasten the . transmitt er in the mobile mounting ra ck using the two
rotating fastener&.
3.2 . 2 Connect antenna, powe. r, (and receiver) cables at back of transmitter.
CAUTION:
The antEcnna must alway,. be connected befo re the transmitt er i s operated .
.3.2.3 Pi::e-set. gain control #1 to the correct position . The correct gain setting
is determined by adjustment. for about 5 to 7 VU of gain reduction (meter position
No .. l) when talking at a normal level and istance from the microphone (in chan-
nel 1 inp~t), __The normal position for the ga in reduction indicat or is approxi-
mately O VU. When full modulation of the transmitter is reached, the meter will
deflect to the left (as much as -20 VU) indicating the amoung of automatic gain
reduction necessary to maintain 100% modulation.

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Continued:
3.2.4
It
is
edvisa&l~
to
start
t--he-vehicle-eegiee
before
-eegiaai~
of
tra
n
smis
s
ion,
since
the
transmitter
will
draw
about
6
Gr
7
aips
from
the
battery.
The
transm
i
tter
dr-ews
very
little
current
in
"Stand
By",
however,
remember
that
t
he
TPS-TC-1
control
unit
is
connected
to
the-.ccessory-
switch
of
the
vehicle,
and
this
switch
must
be
ON
before
the
transmitter
will
operat-e.
3.2
. 5
The
final
two -
steps
to
mobile
transmission
is
to
turn
on
the
STAND
BY
switch
of
the
control
unit.
At
temperatur~s
below
-10°C (+l-4°F)
it
is
necessary
t o
turn
on
the
stand
by
switch
two
minutes
prior
to
AB
anticipated
traa
smissioa
,
in
o
rd
er for
the
fr
-e
quee
cy
to
--e-e---wit-hin
tole~ance.
Fi-B&lly,
-with
the
mic
rophone
plugged
in to
the
connector
on
the
bottom
side
of
the
cont
-
rol
unit,
-press
th
e
"Talk"
button
on
the
microphone
to
transmit
.
For
long
transmissions,
the
"Transmit"
switch
on
the
control
unit
can
he
placed
to
"ON"
position,
eliminating
the
-
need
to
hold
the
microph
o
ne
-but-
ton
depressed
. The two
lamps
on
the
contr·o1
unit
visually
indi
c
at
e t
he
stan
d
by
and
transmit
status
of
the
transmitter.
3. 3
Stationary
Remote
Operation
.
For
remote
operations
from
115
volt
AC
power,
proceed
as
follow
s:
3.3.1
Locate
transmitt
e
r,
if
possible,
where
the
operator/a
nno
uac
er can
re
ac
h
th
e
controls,
where
pow
er
i s
available,
and
where
the
minimum
len
g
th
of an
te
nn
a
co
ax
cable
is
re
quired
.
3.3.2
First
connect
the
antenna
to
Jl
of
the
transmitter
.
CAUTION:
Always make
sure
the
antenna
is
connected
before
transmitting
.
3.
3.3
Connect
the
AC
power
adapter
cable
~o
the
9
pin
DC
pbwe-r
co
nnect
or
on
the
back
of
the
transmitter
. ---
CAUTION:
Always
connect
the
AC
power
adapter
cable
to
the
transmitter
before
plugging
i
nt
o
115
V.
power.

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CONTINUED:
3.3.
4·
Plug
AC
power
cable
into
115
yol
t
4C
.
powe
r
rec
e
pt
acle.
Make
su
re
the
receptacle
is
the
new
approved
arounding
type
which match
es
the
plug
supplied
with
the
RPT-25
or
RPT-40.
Do
not
attempt
to
defeat
t
hi
s
grounding
feature-
it
is
important
to
your
safety.
If
extension
cable
s
ar
e u
sed
make
sure
both
e
nds
have
the
grounding
(round
prong)
feature.
tf
per sonn
el
operating
this
equipment
will
be
standing
on
1011°
or
touchin&
metal
obj
ec
ts
which
are
ea
rth
grounded.
special
precautions
regarding
operatio
n
of
t
his
or
any 115
volt
AC
appliances
must be
observed.
3.3.5
Connect microphone
(8)
to
the
desired
input,
pla
ce
transmitter
power
switch
in
Stand
8y
. The
meter
should
indicate
approxim
a
te
ly
-0
VU
in
position
l
of
the
meter
switch,
Sett~•
aitrophon•
aain
with
th
e
appropriate
knob
fc
about
5
to
7
VU
of
gain
reduction
as
indicated
by
a
de
fl
ection
of
the
VU
meter
to
the
left
. The
audio
can
be
monitored
by a
head
phone
(oOO
ohms
or
greater)
plugged
into
the
Monitor
Jac
k.
The
transmitter
will
be modu
lated
the
maximum
, amount when any amount
of
gain
reduct
i
on
is
ind
ic
at
ed
on
the
meter.
High
gain
settings
are
ve
ry
larg
~ amounts
of
gain
reduction
can
produce
undesirable
effects.
Monitoring
will
aid
in
determining
of
co
r
re
c t
gain
settings.
Position
No.
2
of
the
meter
switch
t ~ a
tonven
t
ional
audio
VU
me
ter
..
CThe
higher
the
reading
-
the
more
the
audio)
.
Th
" t·
eading
sho
ul
d p
ea
k
at
ab
out
O
VU
for
100'7.
modulation.
3.S
. 6
Aft
e r
the
audio
ha
s b
een
c
he
ck
ed
out and le
vels
set,
the
power
switch
can
be
set
LO
Transmit.
Po~llions
8
th
tough 9 on
th
e
RP
T-40 and
Positions
8
through
10
on
the
RPT-25
indicate
th@
condi
t
ions
of
var
ious
circuits
of
the
transmitter.
The normal
valu
e
of
thes
e
var
i
ous
re
ading
s
ar
e i ndi c
ated
in
the
test
report
sheet
in
c
luded
with
this
transmitt
er .

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CONTINUED:
It
is
helpful
to
refer
to
these
meter
reading
to
determin~
if
the
transmitter
is
operating
normally.
Position
8
is
relative
power
output,
and
verifies
that
the
transmitter
is
delivering
power.
Always
make
sure
the
antenna
is
connected
to
the
transmitter
before
switching
to
transmit.
3.3.7
TEST
METER
FUNCTIONS
RPT-40
&
RPT-25
POSITION
1.
POSITION
2.
POSITION
3.
POSITION
4.
POSITION
5.
POSITION
6.
POSITION
7.
POSITION
8.
POSITION
9.
POSITION
10.
TRANSMITTER
TEST
METER
GAIN
REDUCTION
AUDIO
LEVEL
(VU)
RF
DRIVE
TO
TRIFLER
Ql
RF
DRIVE
TO
DOUBLER
Q2
RF
DRIVE
TO
DOUBLER
Q3
.
RF
DRIVE
TO
BUFFER
Q4
POWER
AMP.
IC
RELETIVE
RF
OUTPUT
POWER
SUPPLY
B+
RF
DRIVE
TO
TRIFLER
Ql (RPT-25
ONLY)
METER
POSITIONS
3,
4,
5,
6 -
REFER
TO
DRAWING
800•019-3
METER
POSITION
7 -
REFER
TO
DRAWING
800-047
METER
POSITION
10
-
REFER
TO
DRAWING
800-050

www.SteamPoweredRadio.Com
.,
SICTIG~
V
S.l
TOeLS
FORIALIGNMBNT
·
~,
UT
SllllS
l.
Model
#43
B~rd
Wattmeter with impedance
of
,o
ohm,.
2.
Bird
l Watt Element
100•2SO
MH1.
3. •
Bird
50
·Watt Element
1~0-2SO
MH1.
4• .
Model
f8135 Bird
150
Watt,
,o
0hm
·Coaxia1
ae1i1tor.
-5.
GC
8727
Tuning
Tool.
6.
GC
5009
·
Tunin&
Tool,
7.
Screwdriver
8.
3/16
Nut
Driver
9,
Hewlett
Packard
Distortion
Analy1er ·~odel
#33~.
10. Hewlett
Packard
Oscillator
Model
f204C
11. Hewlett
Packard
Attenuator
Set.
12. · Hewlett
Packard
Frequency Counter·
Model
1,J2.1c.
13. Connecting Cablea.

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SECTION
V
(cont'4)
5.2
RPT•25
RF
AI!>JUSTMENTS
5,2,1
Adjust
on ER•l2/7 module
for
13.2
V
DC
output.
Measured from ground
to
Pin
#9
of
relay
(RY-1). (Under
chassis)
5,2,2
Place
Test
Meter
into
·
Poaition
#3, Tune
L4
of
the
DFM-1D
for
a
Maximum
Read-
ing.
Refer
to
Figure
5-3
for
coil
location,
5,2.3
Tune
Ll&l
on
Multiplier
,oard
fo
Minimum
in
Tes~ Meter
#3
,
Pl•ce
Test
Meter
to
Position
14 and
tune
L202
for
·
Maximum,
After
reading
is
obtained,
tune
LlOl and 1102
for
Maximum
Reading
in
Test
Meter
Position
#4.
Refer
to
Figure
5-1
for
coil
location.
5.2.4
Tune Ll03
for
Minimum
in
Test
Meter
Position#~
.
Put
Test
Meter
to
#5
and
tune
Ll04
for
Maximum
,
After
reading
i~
obtained
tune Ll03 and Ll04
for
Maximum
Reading
in
Tl&t Meter
Position
f5
,
5,
2,5
Place
Teat
Meter
to
Po1ition
#6
, Tune Ll05 and Ll06
for
Peak
Readings.
5.
2.
7
Insert
a
50
ohm
Dummy
Antenna
with
a Watt Meter
into
output
of
Multiplier
Box
.
Adjust
C39
and
C40
for
·
Maximum
Power
0utput
.
This
should
be
300
to
500
milliwatts
.,
(150
MHz
one watt
element).
Refer
t~
Figure
5•1
for
C39
and
C40
locations
.
Connect
Multiplier
Box
to
Tripler
and Buffe~
Stage
. Connect
50
ohm
Dummy
and Watt Meler
to
output
of
Tripler
and
Buffer
Stage
. (450
MHz
element)
5.
2.8
Tune Cl
of
Tripler
and
Buffer
Stage
for
Maximum
Reading
in
Position
#10
of
Test
Meter. See
Figure
5-2A
for
locations
.
5.
2.9
Tune
C2
for
Maximum
Reading
in
Position
#10
of
Test
Meter.
5.
2.10
Tune
C7
for
Minimum
Reading
in
Position
#10
of
Test
Meter.
5. 2.
11
Tune
CB
for
Maximum
R~ading
in
Position
#10
of
Test
Meter.
5. 2.
12
Tune
C9
for
Minimum
Reading
in
Position
#10
of
Test
Meter.
5.2
.
13
Tune
ClO
for
Maximum
Reading
in
Position
#10
of
Test
Meter.
5.2
.14
You
should
have
some
power
indication
on Watt Meter.
~epeat
steps
8
through
13
until
a
10
watts
or
better
reading
is
obtained.
5.
2.15
Adjust
efficiency
POT
(R8)
located
on
left
side
of
Main
Frame
of
transmitter
for
5
watts
output
.
(R8
is
located
on
top
side
of
chassis)
.
5.
2.16
Connect
output
of
Tripler
and
Buffer
·
Stage
to
the
input
of
the
RF
"Power
Am-
plifier
Box
. Connect P
50
~
hm
Dummy
Load and Watt Meter
t~
output
of
trans
~
mitter.