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)