Marti Electronics SRPT-30 User manual

MARTI
ELECTRONICS
RPU TRANSMITTER
MODELS: SRPT-30
SRPT-40A

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RF EXPOSURE WARNING
This remote pickup unit (RPU) contains a radio frequency (RF) transmitter. During normal operation it sends
out radio frequency (RF) signals. In August 1996, the Federal Communications Commission (FCC) adopted
RF exposure guidelines with safety levels for wireless devices.
CAUTION: To maintain compliance with the FCC’s RF exposure guidelines, the antenna(s) used for this
transmitter must be installed to provide a separation distance of at least 6 meters from all persons during normal
operation and must not be co-located or operating in conjunction with any other antenna or transmitter. In
addition, no antenna with a gain of greater than 11 dBi shall be used.
Unauthorized antennas, modifications, or attachments could damage the transmitter and may violate FCC
regulations.

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WARNING
THIS EQUIPMENT MUST BE OPERATED WITH A 3-PRONG
GROUNDED OUTLET RECEPTACLE. FAILURE TO USE A
PROPERLY GROUNDED OUTLET MAY RESULT IN IMPROPER
OPERATION OR SAFETY HAZARD!
LIMITED WARRANTY
The Seller warrants that, at the time of shipment, the products manufactured by the Seller are free from defects in
material and workmanship. The Seller's obligation under this warranty is limited to replacement or repair of such
products which are returned to Marti at its factory, transportation prepaid and properly insured, provided:
a. Notice of the claimed defect is given to Marti within one (1) year [two (2) years for STL systems] from date of
original shipment and goods are returned in accordance with Marti instructions.
b. Equipment, accessories, tubes and batteries not manufactured by Marti are subject to only such adjustments as
Marti may obtain from the supplier thereof.
c. This warranty does not apply to equipment which has been altered, improperly handled, or damaged in any way.
The Seller is in no event liable for consequential damages, installation cost or other costs of any nature as a result of the
use of the products manufactured or supplied by the Seller, whether used in accordance with instructions or not.
This warranty is in lieu of all others, either expressed or implied. No representative is authorized to assume for the Seller
any other liability in connection with Seller's products.
MAILING & SHIPPING ADDRESS:
Broadcast Electronics
MARTI Electronics Division
4100 North 24th Street
Quincy, IL 62301
The United States of America
COPYRIGHT NOTICE
©2001 All Rights Reserved
Marti Electronics
3rd printing, January 2003
No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval system , or translated into any
language, natural or computer, in any form or by any means, without the prior written permission of Marti Electronics.

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Artwork depicting circuitry in this manual is protected by copyright laws.
Information in this manual is subject to change without notice and does not represent a commitment on the part of Marti
Electronics.
Marti Electronics may make improvements and/or changes in this manual or in the product described herein at any time.
This product could include technical inaccuracies or typographical errors.
PHONE NUMBERS:
Sales [phone]
Service [phone]
FAX [phone]

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ABOUT THIS MANUAL
This manual supports both the SRPT-30 and SRPT-40A RPU transmitters for all standard (and some non-
standard) frequency bands. The SRPT-30/40A in some frequency bands may not yet be available during the
printing of this manual. The manual will be revised as new frequency bands become available.
Manual Part Numbers:
Kit, Binder and Manual: 979-9967-1
Manual Only: 566-035-1

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TABLE OF CONTENTS
Introduction ..........………................................................................................................. 1
Specifications & Ordering................................................................................................. 4
Unpacking and Inspection ................................................................................................. 7
Installation ......................................................................................................................... 8
Antennas ........................................................................................................................... 16
Control, LED, & Connector Functions ……………………………………….………… 18
Operation ........................................................................................................................... 23
Theory of Operation .......................................................................................................... 31
Drawing 702-124 “SRPT-30/40A Functional Block Diagram”................................... 34
Drawing 702-117 “SRPT-30/40A RF Systems & Control”......................................... 35
Recommended Test Equipment ………………………………………………………… 36
Tools For Alignment ……………………………………………………………………. 36
SRPT-30/40A Transmitter Factory Test Report …………………………………...…… 37
Calibration and Adjustments …………………................................................................. 38
Drawing 702-122 “SRPT-30/40A Adjustment Locations”……………………..…… 50
SRPT-30/40A Bill of Material and Schematics ……………............................................ 51

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INTRODUCTION
See the SPECIFICATIONS & ORDERING section for a listing of available frequency
ranges and power models.
SRPT-30 DUAL-CHANNEL RPU TRANSMITTER
SRPT-40A FREQUENCY AGILE RPU TRANSMITTER

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The Marti Models SRPT-30/40A are wide-band – high power RPU Transmitters designed to operate in the Remote
Pick-Up Broadcast Service as defined in Part 74, Subpart D, of the FCC Rules and Regulations. The SRPT-30 replaces
the Marti RPT-30 series of RPU’s. Like its predecessor, the SRPT-30 has two frequency channels and a four-input
mixer for mic/line audio. Unlike the RPT-30, the SRPT-30 uses synthesizer technology (not to be confused with
frequency agile) instead of the discrete crystal technology. Also the SRPT-30 is equipped with a wide-band power
amplifier that has a power output up to 30 watts that can be adjusted from the front panel. This, combined with the wide-
band synthesizer, benefits the operator in the following ways: (1) Frequency separation between F1 and F2 frequency
can be up to 50 MHz and (2) No RF tuning required.
The SRPT-40A also uses synthesizer technology with a wide-band power amplifier and requires no tuning. It is
frequency agile up to 50 MHz with a front-panel adjustable output power up to 60 watts in some models. The frequency
can be “dialed in” from the front panel and will automatically tune precisely to all frequencies divisible by 5 KHz or
6.25 KHz increments. It will also tune to within ±.00015% tolerance of most other frequencies not divisible by 5 KHz or
6.25 KHz increments. Finally, the user may operate the SRPT-40A in channel mode where he may store and recall up to
10 frequencies.
Refer to the SPECIFICATIONS & ORDERING section for a listing of available frequency ranges and power
models. These transmitters, when used with their recommended companion receiver, provide a remote broadcast link
having audio quality not approached by conventional voice communication radio equipment. The SRPT-30/40A
transmitters operate from 110-120 VAC or 220-240 VAC (manually switched internally), 50/60 Hz. The transmitters
can also operate on 12-15 VDC or 15-30 VDC battery (or external supply) in fixed, portable, or mobile, service. Four
audio input channels are provided with individual mixing gain controls. A meter and selector switch are provided for
monitoring forward and reverse power, power supply voltage, PA current and audio compression.
SRPT-30/40A Features:
·Four balanced microphone mixing inputs, one switchable to balanced line level
·No RF tuning required
·Switching Power Supply operates on any AC voltage from 110-120 VAC or 220-240 VAC
(manually switched internally), 50/60 Hz
·LEDs indicate High VSWR, Over-Temperature, AFC Lock, and Transmit
·Illuminated VU Meter for displaying Forward/Reverse Power, PA current, Power Supply
voltage, and Audio Compression
·Output power adjustable from front panel
·External 12-15 VDC or 15-30 VDC supply capability and external transmit control
·When operating on external 12-15 VDC supply, RPU will still remained locked for
external supply voltages as low as 7 VDC (Max power will de-rate linearly below 12 VDC)
·Fully suppresses external voltage supply noise such as car alternator
·High speed imbedded µ-controller to perform the following additional features:
·Power held constant over frequency, temperature, and voltage change
·High PA temp and VSWR warning indicators
·Auto frequency re-lock due to power outage
·Auto fold-back and recover due to high VSWR
·Auto shutdown due to very high PA temp – auto recover after cool down
·Auto shutdown due to open/short-output – auto recover
·Can operate as TSL (Models SRPT30-450T and SRPT40A-450T)

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SRPT-40A Only Features:
·Continuous-duty output - 60 watts maximum in some models
·Frequency agile pushwheel switches allow selection of almost any frequency (100 Hz
steps) in operating band up to 50 MHz
·10 user programmable channels
·No frequency look-up table required
·Remembers and locks-on last frequency during power-up
·Frequency resolution: 5 or 6.25 KHz steps – ± .00004% accuracy
- Most other frequencies (100 Hz steps) - ± .00015% accuracy
SRPT-30 Only Features:
·Continuous-duty output - 30 watts maximum most models
·Two frequency channels, F1 and F2, selected at time of order
·Up to 50 MHz separation between frequency channels
·Selected frequencies divisible by 5 or 6.25 KHz steps have a ± .00004% accuracy
- Most other selected frequencies have a ± .00015% accuracy

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Models SRPT-30 and SRPT-40A
Remote Pick-Up Broadcast Transmitters
SPECIFICATIONS & ORDERING
Conditions (unless specified otherwise): 1.5 VSWR, 110 VAC input with B+ = 13 Volts, 25ºC ambient
Frequency Bands and
Maximum Output Power:
See ORDERING INFORMATION below.
Frequency Agility and
Accuracy
SRPT-40A (450 models and
less)
An executed “dialed-in” frequency that operates within model frequency
range will have an accuracy within:
(1) ± .00004% for frequency divisible by 5 or 6.25 KHz, or
(2) ± .00015% for MOST frequencies NOT divisible by 5 or 6.25 KHz*
Frequency Agility and
Accuracy
SRPT-40A (800 models and
greater)
An executed “dialed-in” frequency that operates within model frequency
range will have an accuracy within:
(1) ± .00004% for frequency divisible by 10 or 12.5 KHz, or
(2) ± .00015% for MOST frequencies NOT divisible by 10 or
12.5 KHz*
Frequency Selection and
Accuracy
SRPT-30 (450 models and less)
Two frequencies only, F1 and F2, determined at time of order, must
operate within model frequency range and will have an accuracy within:
(1) ± .00004% for frequency divisible by 5 or 6.25 KHz, or
(2) ± .00015% for MOST frequencies NOT divisible by 5 or 6.25 KHz*
Frequency Selection and
Accuracy
SRPT-30 (800 models and
greater)
Two frequencies only, F1 and F2, determined at time of order, must
operate within model frequency range and will have an accuracy within:
(1) ± .00004% for frequency divisible by 10 or 12.5 KHz, or
(2) ± .00015% for MOST frequencies NOT divisible by 10 or
12.5 KHz*
Operating Temp. Range: -10ºC to +45ºC
Frequency Stability (over
operating temperature range):
0.0001%
Deviation: Adjustable, ± 20 KHz max
Audio Bandwidth: Standard: 7.5 KHz
Available: 5 KHz, 10 KHz, specials upon request
Signal-to-Noise: ≥53 dB, 5 KHz deviation, 75 µsec pre/de-emphasis
Frequency Response: ± 1.5 dB from 50 Hz to Audio Bandwidth, 75 µsec pre/de-emphasis
Distortion: ≤2% from 50 Hz to Audio Bandwidth, 75 µsec pre/de-emphasis
Spurious Emissions: More than 60 dB below carrier
RF Connector: Type N-Female
RF Output Impedance: 50 Ohms
Audio Inputs: Four balanced microphone (150 ohms) inputs (XLR-3) with mixing
controls. One input switchable to balanced line level at microphone #4
input and D connector on rear panel.
Audio Input Levels: Microphone: -68 to -35 dBm
Line: 0 to +10 dBm, 6-800 Ohms
Modulation Control: Broadcast-quality compressor/limiter built in.
Encoding: Sub audible 27 Hz. tone encoder built in.
Metering/Indicators: Illuminated meter indicates forward and reverse power, PA current, B+,
and audio compression. LEDs indicate TRANSMIT, AFC LOCK,
HIGH VSWR, and HIGH TEMP.

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Controls: (4) Input level controls, METER control knob, ENCODE switch,
POWER ADJUST pot, TRANSMIT switch, and MONITOR jack.
SRPT-40A: FREQUENCY SELECT switches and EXECUTE switch
SRPT-30: F1/F2 switch
Power Requirements: 110-120 VAC or 220-240 VAC (manually switched internally on power
supply for proper input), 50/60 Hz
External DC operation on 12 - 15 volts or 15 - 30 volts.
Approximate PA Current
Rating (at maximum power
output):
SRPT-40A: 8.5 to 10.5 Amps
SRPT-30: 6.5 to 7.5 Amps
(The data above varies across frequency band and from model to model)
Accessory Connector: 15-pin D connector for DC power, remote control, encode, line level
input.
Weight: Net: 8.25 Lbs (3.74 Kg).
Packed: 16.75 Lbs (7.60 Kg).
Dimensions: 11.5in (29.21cm) W x 3.5in (8.89cm) H x 14.3in (36.83cm) D.
Packed: 19in (48.26cm) W x 22in (55.88cm) H x 9in (22.86cm) D.
* - There does exist a few non-standard frequencies that will not automatically tune to within .00015% of
requested frequency. For those frequencies, the operator must change to the nearest standard frequency and
then manually tune the reference oscillator to desired frequency. Consult factory for frequencies not perfectly
divisible by 5 KHz or 6.25 KHz. We will be able to tell you how close the output will come to desired frequency.

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ORDERING INFORMATION
Conditions (unless specified otherwise): 1.5 VSWR, 110 VAC input with B+ = 13 Volts, 25ºC ambient
MARTI
PART #
Frequency
Range
(MHz)
Maximum
RF Output
Power (W)
Typical MAX RF
Output Power over
Frequency
Certifications
SRPT30-150 135-185 30 20W 135-140 MHz
30W 140-180 MHz
20W 180-185 MHz
FCC ID: DDE-RPU-60W-150S
(FCC Part 74 Subpart D)
Emission Designators:
25K0F3E, 30K0F3E
SRPT30-230 215-250 30 30W 215-250 MHz
SRPT30-250 235-265 30 25W 235-245 MHz
30W 245-265 MHz
SRPT30-330 300-350 30 20W 300-315 MHz
30W 315-350 MHz
SRPT30-450
-or-
SRPT30-450T
(for TSL RPU)
430-480 30 30W 430-480 MHz FCC ID: DDE-RPU-50W-450S
(FCC Part 74 Subpart D)
Emission Designators:
10K0F3E, 25K0F3E, 50K0F3E
SRPT30-950 935-965 20 20W 935-960 MHz
18W 960-965 MHz
SRPT40A-150 135-185 60 50W 135-140 MHz
60W 140-175 MHz
50W 175-180 MHz
40W 180-185 MHz
FCC ID: DDE-RPU-60W-150S
(FCC Part 74 Subpart D)
Emission Designators:
25K0F3E, 30K0F3E
SRPT40A-230 215-250 30 30W 215-250 MHz
SRPT40A-250 235-265 30 25W 235-245 MHz
30W 245-265 MHz
SRPT40A-330 300-350 30 20W 300-315 MHz
30W 315-350 MHz
SRPT40A-450
-or-
SRPT40A-450T
(for TSL RPU)
430-480 50 50W 430-465 MHz
45W 465-480 MHz
FCC ID: DDE-RPU-50W-450S
(FCC Part 74 Subpart D)
Emission Designators:
10K0F3E, 25K0F3E, 50K0F3E
SRPT40A-950 935-965 20 20W 935-960 MHz
18W 960-965 MHz
Available OPTIONS for the SRPT-30/40A Transmitters
Marti No. Description
585-141 12-15 VDC External Supply Cable
585-142 15-30 VDC External Supply Cable
585-139 12-15 VDC Mobile Repeat Cable, CR/AR-10 to SRPT-30/40A
585-140 15-30 VDC Mobile Repeat Cable, CR/AR-10 to SRPT-30/40A
585-143 Fixed Repeat Cable, CR/AR-10 to SRPT-30/40A
700-250-13 Rack mounting kit
700-252-2 Mobile mounting kit
565-006-1 Racom 1402 Automatic Morse Code Station Identifier with mounting kit
585-088 SRPT30/40A TSL to Racom Cable Assembly

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UNPACKING & INSPECTING
This equipment was factory tested, inspected, packed, and delivered to the carrier with utmost
care. Do not accept shipment from carrier which shows damage or shortage until the carrier's agent
endorses a statement of the irregularity on the face of the carrier'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, stop further unpacking 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 shortage. Do not discard any packing
material until all items are accounted for. Small items are often thrown away with packing material.
Packing material should be retained until equipment testing is completed. Any equipment returned to
the factory should be packed in original cartons, insured, and pre-paid.

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INSTALLATION
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 equipment, which produces high
temperatures. It is highly recommended that if the equipment is mounted in a rack cabinet, a blower
should be installed in the cabinet as well.
Problems can also be avoided by locating this unit away from other equipment which has
transformers that produce strong magnetic fields. These fields can induce hum and noise into the
Marti equipment thus reducing performance. Strong radio-frequency (RF) fields should be avoided
where possible. Extensive shielding and filtering have been incorporated into this equipment to permit
operation in moderate RF environments. All equipment racks, cabinets, etc., should be bonded
together by wide copper grounding strap to ensure that all system elements are at RF ground poten-
tial.
Stationary Remote Broadcast Installation
The basic stationary remote installation consists of the SRPT-30/40A transmitter, a 110-120 or 220-240 VAC
power source, microphones and other audio program sources, and a portable antenna. Remotes using portable antennas
inside buildings have very limited range (typically less than one mile). If greater range is needed, consider locating the
transmitting antenna outside the building at a height necessary to provide a line-of-sight path to the receiving antenna.
This may not be practical if a great length of coaxial cable is required. Many broadcasters are using the Marti mobile
relay system to do remotes from inside buildings. This system consists of the originating transmitter with its antenna
inside the building which transmits to a “mobile relay” parked outside the building. The mobile relay consists of a Marti
Model AR-10 receiver and Marti RPT series transmitter with mobile antennas installed in a vehicle. The AR-10
receiver picks up the encoded signal originating from the RPT series transmitter located inside the building,
automatically turns on the relay transmitter (on a different frequency), which re-transmits the program to the distant
receiving antenna at the radio station studio or transmitter site. (Mobile relay equipment packages are available from
Marti.)
Stationary Remote Installation Procedure
1. The transmitter is normally located near the announcer or engineer to permit access to gain controls, microphone
inputs, the monitor jack, and metering.
Personnel must not be near the antenna when radiating. Locate antenna as far as possible from
people and equipment susceptible to RF radiation. Do not mount antenna directly on transmitter.
Refer to ANSI C95.1 “Limits on Non-Ionizing Radiation.”

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2. With the SRPT-30/40A TRANSMIT/STANDBY switch in “STANDBY” position, plug the transmitter into a
grounded, three-prong, 110-120 or 220-240 VAC outlet.
WARNING
THE MANUAL SWITCH ON THE INTERNAL SWITCHING POWER SUPPLY IS SET AT THE
FACTORY TO THE 115 POSITION IF THE ORDER WAS FOR 110-120 VAC.
THE MANUAL SWITCH ON THE INTERNAL SWITCHING POWER SUPPLY IS SET AT THE
FACTORY TO THE 230 POSITION IF THE ORDER WAS FOR 220-240 VAC.
IF THE OPERATOR PLANS TO OPERATE THIS UNIT AT AN AC VOLTAGE DIFFERENT THAN
WHAT IS STATED ON ORDER, IT IS THE REPONSIBILITY OF THE PURCHASER TO SWITCH TO
THE APPROPRIATE POWER SUPPLY POSITION.
WARNING
DO NOT PLUG INTO AC WITHOUT FIRST KNOWING THE POSITION OF THE AC INPUT SWITCH
LOCATED ON THE SIDE OF THE INTERNAL POWER SUPPLY.
SEE AC LINE INPUT SELECTION – 110-120 VAC OR 220-240 VAC SUB-SECTION IN THE
CALIBRATION AND ADJUSTMENTS SECTION FOR VERIFICATION AND CHANGING.
WARNING
THIS EQUIPMENT MUST BE OPERATED WITH A 3-PRONG, GROUNDED, 110-120 OR 220-240
VOLT AC OUTLET RECEPTACLE!
FAILURE TO USE A PROPERLY GROUNDED OUTLET COULD RESULT IN A SAFETY HAZARD
OR FAULTY EQUIPMENT PERFORMANCE.
IF AN EXTENSION CORD IS USED, IT MUST BE THE THREE-WIRE GROUNDING TYPE TO
INSURE SAFETY.

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WARNING
DO NOT CUT OFF THE GROUND PIN OF A 3-PRONG PLUG!
EXCESSIVELY LONG EXTENSION CORDS SHOULD BE AVOIDED SINCE THE VOLTAGE DROP
CAN DEGRADE EQUIPMENT PERFORMANCE.
DO NOT ALLOW THE SRPT-30/40A TO GET WET.
DO NOT OPERATE WHERE PERSONNEL TOUCHING THE TRANSMITTER (OR ITS
MICROPHONE, ANTENNA, OR OTHER CONNECTED EQUIPMENT) ARE STANDING ON WET
GROUND OR CONCRETE.
3. For locations where AC power is not available, the SRPT-30/40A can be powered from a fully charged automobile
battery.
4. Connect a portable antenna such as the Marti PAV/150, PAV-450, or YC-450 to the ANTENNA connector on the
back of the transmitter.
Mobile Installation
The SRPT-30/40A transmitter can be installed in the vehicle where the TRANSMIT/STANDBY function can be
operated directly, or the transmitter can be located elsewhere (in the trunk of a car or rear of a van) and controlled
remotely. The choice depends upon the type of vehicle and the type of operation anticipated. The antenna(s) are usually
mounted on top of the vehicle to provide maximum height.
Transmitter Mounting
1. Locate transmitter where vent holes on top and rear of unit are not obstructed. Leave enough space for the mic. Plug
on the front panel and the accessory plug on rear of unit.
2. Hook the four mounting fasteners (in retracted position in the four slots on the sides of the transmitter. See Fig. 1.
(Fasteners are in Mobile Mounting Kit, 700-252-2).
3. Mark the location of the two mounting holes in each fastener bracket. Drill 7/64” diameter holes into the mounting
surface at the marked places for #6 x 1/2” sheet metal screws.
4. Attach the mounting fasteners with the sheet metal screws provided. Secure the transmitter with the fasteners.
Receiver Mounting
For mobile repeat using the Marti AR-10 Mobile Repeat Receiver, mount the receiver near the transmitter using the
three fasteners supplied in Mobile Mounting Kit, 700-252-2.

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SRPT-30/40A
700-252-2
MOBILE MOUNT FASTENERS
Mobile Remote Control
Remote control of the SRPT-30/40A transmitter requires a switch to control primary 12-15 VDC power (or 15-30
VDC) and a second switch to control the transmit function. The primary 12-15 VDC (or 15-30 VDC) control
requirement can be met by tapping the ignition switch circuitry of the vehicle. The “transmit” function can be performed
by installing a switch on the vehicle.
FIG. 2A and 2B show the electrical circuit of a mobile installation for 12-15 VDC (585-141) and 15-30 VDC (585-
142), respectively.
Mobile Repeat
Mobile repeat operation is covered under STATIONARY REMOTE BROADCAST INSTALLATION.
Electrical connection for a 12-15 Volt supply is made through Mobile Repeat Cable No. 585-139. This cable is
connected between the SRPT-30/40A transmitter and AR/CR-10 receiver. Power is obtained by connecting the fused
RED wire to the 12-15 VDC battery or supply. The supply must be capable of delivering 10 Amps minimum. The
electrical diagram of this cable is shown in FIG. 3A.
NOTICE
WHEN OPERATING THROUGH A CIGARETTE LIGHTER, THERE MAY BE A ONE TO TWO VOLT
DROP DUE TO THE LENGTH OF INTERNAL VEHICLE WIRING AND THE LARGE AMOUNT OF
CURRENT REQUIRED TO OPERATE THE SRPT-30/40A AT HIGHER OUTPUT POWERS.
THE SRPT-30/40A WILL OPERATE WITH AN EXTERNAL INPUT VOLTAGE AS LOW AS 7 VDC.
HOWEVER THE MAXIMUM RF OUTPUT POWER WILL DE-RATE LINEARLY AS THE EXTERNAL
INPUT VOLTAGE DROPS BELOW 12 VDC.
Electrical connection for a 15-30 Volt supply is made through Mobile Repeat Cable No. 585-140. This cable is
connected between the SRPT-30/40A transmitter and AR/CR-10 receiver. Power is obtained by connecting the fused
BLUE wire to the vehicle 15-30 VDC battery or supply. The supply must be capable of delivering 10 Amps minimum.
The electrical diagram of this cable is shown in FIG. 3B.
Automatic Morse Code Station Identifiers
The SRPT30/40A-450T TSL RPU’s are used for sending data back from a transmitter site to the studio (also known
as telemetry). In older FCC requirements, un-manned transmitters required an automatic remote control system to send
data back to the studio for verifying that the transmitter was operating properly. Many broadcasters today are still using

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this system. Along with the data, a station identifier in morse code can also be input into the TSL. Marti typically uses
the RACOM MODEL 1402 Automatic Morse Code Station Identifier to accomplish this task. Marti stocks and sells the
RACOM 1402 (part number 565-006-1) along with the interconnecting cable (part number 585-088). Typically, the
cable is connected to the RACOM 1402 at the Marti facility. The customer can also connect up the cable as well. Refer
to Drawing 702-125.
Mobile Antenna Installation
One or more mobile antennas are required depending upon the various receive and transmit frequencies and whether
antenna duplexing is used. Antennas are specified in the various system packages listed in the Marti literature. The
installer should follow the instructions supplied with the mobile antennas.

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