Marti Electronics RMC15 A User manual

MARTI ELECTRONICS, INC.
P. O. Box 661
1501 N. Main Street
Cleburne, Texas 76031
HARNING
This equipment must be powered [rom s 3-prong grounded outlet receptacle. Failure
to use a grounded outlet may prevent proper operation or result in a safety hazzard.
RMC 15
REMOTE CONTROL SYSTEM
GENERAL INSTRUCTION MANUAL
(SEE MODEM MANUAL FOR MODEN CIRCUIT DETAILS)
tA/I$C
WARRANTY:
Excop, III olherwit6 provided i/\ !hi<. laclion, th. ~ujpm8"1 d"""lbod herein i •• old onder the following
gvar(lnteel
Modi aqlee. to ropeil or replace wUh;" a .no (1) year period and wilhout cllorg.., any equip", .. nl Or
pcr" which Oft tlefeellve a. 10 wO"lfIGn.hlp or "",Ieria l and ...-hOcIl ole relumed to Morti at il. foclory,
ITCOOSflOrlahan prepaid and p,operl~ lo,ur.,d, provided,
(a) Nolice 01 ti,e claimed defocl is ei....,n Marli wi Ihin ane (1) Yltar from dole oppoaring on invoice and
good. Or" ",turned in accordance wilh Morll 'mlr\Klloo'.
,b) Equipm"rr1, OKcuuo,ie,. tubol and ballerie. nol malWfaclurod by MQrl' cue ,ubjecl to only .uch ad·
ju.tment. 0, Moni may oblo;n fram the auppli"r therool.
(e) E'luipmc nl or occc,sori~, .h .. U not ~ d .cm ed to oe defective if, ofter examinolion by Morti or
il. appoinled repre.Dntative, tho equipment cvi.ftI)CG, damage from moit/ore, improper han.
d!inll, imlaliatIon o.r 0perelion.
(d) IfI the livenI thol Moni i. ''''1uired to dDf"nO<l.trale equipment copability "ilher a. 10 'pcclficotions
or dMOCl. In 1'0 .. , II workman.hip aM whe re i, ;. found ,hoI 'hc aquipmont me .. " 'pecifications,
Marti .holl b" en/IIMd to ,olleel all ~.onable expense, from the Buyer including bul nol limited
10, l,ov"l. pe, diom living eXP!'me. and hourly wage roles which have been eltabli,hed by Morli
gnd which 0'8 in eflae! 01 Ih .. limo.
Morli
furtn,r 1I1IO.anle". Ihal ony radio Iron"""",, d,,,er i bed herein will deliver .pecilied rodio fre'luency
po ..... er outpul 01 the onlonno load when connected 10 0 .uiloble lood, but lueh guaranlee ,hail not be con-
Il,uad 01 0 ouaronloc of o"y dofinilo COV0rG\l0 Q( rango of ,oid apparolu •. The gUa,onloe 01 thc.e pora-
graphl i. void II oquipmOrrl 11 ollerod or ropoi,od by olhers Ihon Marti Dr il
s
authorized .e .. ice Repre-
lonlolive, 01 unlc" 'pcdrl'(.(l!iy aUlhofi!cd in "'r1~119 by Marti . No olhor wQrronlie., e~p,e .. ed or impli.. d,
\hall bo opplicoble 10 "~'1 equipment <old h.rounder, and 1"0 foregoing ,holl con,tilule Ihe Buyer's lole
rio"l and remcdy under Ih~ ogfcomcnh (o.nloin-od in Ihi' paragraph, In no evenl Iholl Morli hoye ony
liabilily h3r (on<equon,lcrl oomaoos, or fa, 1o,"" do"'''ge Qr ."poMe direclly Or indireclly ariling Irom Ihe
~,e o( Iho P<QdlKh, 0' ony iuabiBI)' 10 u<~ 1~4H1l oilf, .r seporolely ()( in combinalion wlth other equipmenl
Of material" 0' f,om any olh.J, cauSe.
APRIL 10, 1981

SECTION I--CENERAL
1-1 General Description
1-2 Specifications
1-3 Glossary of Terms
1-6 Test Report
2-1
2-2
2-4
2-6
2-8
2-10
2-11
2-12
SECTION II--INSTALLATION INSTRUCTIONS
General
Communications Installation
Communications Adjustment
Installation of RY 15 R~lay Interface Unit
Potomac AM-19 Antenna Honitor
Transmitter Interfacing
Decimal Point Programming of the Studio Unit·
Channel Assignment Log
SECTIO~ III--OPERATING INSTRUCTIONS
3-1 Channel Zero, Remote Alarm
J-2 Remote and Local Control
3-3 Telemetry Calibration, Failsafe
3-4 Other Functions
SECTION IV--THEORY OF OPERATION
4-1 General
4-2 Simplified Block Diagram, 702-008
4-3 Control Theory
4-5 Transmitter Unit Telemetry Theory
4-6 Studio Unit Telemetry Theory
5-1
5-2
5-3
5-4
5-5
5-7
5-8
5-9
~-lO
5-11
5-12
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-22
5-23
5-24
5-25
SECTION V--CIRCUIT DETAIL
Studio Unit Main Frame, 702~009
Transmitter Unit Main Frame, 702-010
Main Frame Minor Boards Pictorial, 702-011
Power Supply Schematic, 702-012
Power Supply and I/O Harness Parts List
Studio Uoit Logic Assembly Pictorial, 702-013
Studio COntrol Logic Schematic, 702-014
Studio Unit I/O Level Schematic, 702-015
Studio Telemetry Logic Schematic, 702-016
Studio Telemetry Readout Schematic, 702-022
Studio Unit Logic Assembly Parts Li~t
Transmitter Unit I/O Level, Pictorial and Parts List, 800-161-4
Transmitter Unit rio Level Schematic, 702-019
Transmitter Unit Logic Board Pictorial, 702-017
Transmitter Control Logic Schematic, 702-018
Transmitter Telemetry Logic Schematic, 702-020
Miscellaneous Transmitter Unit Logic Schematic, 702-023
Transmitter Unit Logic Board Parts List
Relay Interface Unit Boards Pictorial, 702-021
RY-lS/30 Driver Board Schematic, 800-131-3
RY-lS/30 Relay Board Schematic, 800-135-}
Relay Interface Unit Boards Parts Lists
SECTION VI--PIN DESIGNATIONS
6-1 Studio and Transmitter Uoits
6-2 Relay I:1terface Uoit
6-3 Integrated Circuits, Isolators, and Displays

Page 1-1
~~RTI RMC-LS DIGITAL CONTROL
FEATURES: * Fully Digital Command and Telemetry (FSK). * Single
Push-Button Channel Select. * Telemetry Accuracy 0.1% for Directional
Antenna Monitoring. RMC-15S Does Not Require Operator Calibration.
* Channel Capacity 15 Channels. Expandable to 30 Channels by Optional
RMC-30 Units. * Quartz Crystal Synthesized Frequencies. * Radio Link
or Wire Line Operation. * Large Digital LED Readout at BOTH Studio and
Remote
Unit. * Decimal Point Location Can Be Selected for Each Channel.
* Communication Level Adjustments and Indicators On Front Panel.
GENERAL DESCRIPTION:
The Marti RMC-15 Remote Control System incorporate~ advanced technical design \~ith op-
erator oriented simplicity to meet the needs of the broadcast industry for an accurate
and reliable remote control. The operator may select any metering/control channel by
pressing a single button. The data for the selected channel is then read from a large
digital panel display. Decimal point position on the RMC-lSS readout can be selected
by the user for each data channel. Raise and lower commands can be given for the se-
lected channel by pressing the raise Dr lower button. In addition to these functiOns,
the RMC-tS system has two status monitor channels available.
The channel capacity of the DIC-IS system can be increased to 30 channels by the addic-
lon of the RMC-30S and RY-30 units.
Send/receive communication levels at the studio and remote units are adjustable from
the front panel. The correct level is set by observing LEO indicators which are labeled
low-sec-high.
COMMUNICATIONS OPTIONS:
MODEL RMCl5 TYPE A--Fully digital Remote Control/Telemetry System for VOICE FREQUENCY
LINE COMMUNICATIONS (Half-Duplex schedule 3002 Bi-directional circuit, 20dB maxi-
mum attenuation at 950 Hz and 2400 Hz desired).
MODEL RMCl5 TYPE B--Fully Digital Remote Control/Telemetry System for control STL-8
Link and HIGH SPEED TELEMETRY OVER FM SCA, VOICE LINE, OR TSL. Precludes SCA for
background music. seA is used only while logging. Two BNC cables included.
MODEL RMClS TYPE C--Fully Digital Remote Control/Telemetry System for control over
5TL-8 Link and SUBAUDIBLE TELEMETRY over AM carrier or FM SCA with or without
background music. Requires less than 5 seconds for readout. Includes two BNC
cables. Model 800-105 Subaudible Insertion Board, and LA-20/HPF-50 amplifier-
filter module (exchange for LA-20 amp. module in R-200 Receiver or SCR-8 Sub-
carrier Receiver).
ACCESSORIES:
MODEL &~C30 ACCESSORY UNITS-The addition of these units, one at the studio site and one
at the transmitter site. increase che channel capacity of the system from 15 of
the basic RMC 15 to a total of 30 channels.
RY3S RELAY BUFFER-Internal board for the RMC ISS Studio Unit which delivers output for
the Alarm and Two Status Circuits.
TA-66 '1'lNED AHPLIFlER-66 Khz I\mplifier for relay points ),0 a ;uultihop control link. Rc-
-- establishes tnjl'c(ion levels at each site.

Page' 1-2
RMC-15 DIGITAL REMOTE CONTROL
SPECIFICATIONS
TyPE ...............•.... Digital command and telemetry using internal FSK modems.
CHANNEL CAPACITy ........ Basic 15 channel system expandable to 30 channels. Each
channel provides one data readout and two commands. An
additional 2 channels of status return is provided in the
basic system.
COMMAND OUTPUT .......... All contacts isolated and floating, 3A, 120 VAC.
TELEMETRY ACCURACY ...... 0.1% at full-scale reading of ~l~99. Suggested data in-
put level of 1 to 3 VDC, lKV isolation from ground.
TELEMETRY UPDATE ........ Continuous at optimum speed depending On the nature of the
telemetry link.
DECIMAL POINT AT STUDIO.The decimal point may be programmed for each channel with
switches found under cover plate on the front panel of
studio \Jnit.
FAIL-SAFE CIRCUIT ....... Factory adjusted delay of 15-30 seconds.
position. LED indicators of fail-safe.
OPERATING TEMPERATURE
RANGE ....... , ........... -10 to +50 C.
Defeated in Local
Contacts 3A, 120 VAC.
POWER REQUIREMENTS ...... 110-125 VAC 50/60 Hz. single phase 75 Watts.
DIMENSIONS AND WEIGHTS .. RMC l5S Studio Unit
3.is" high x 19" wide x 14" deep
11 Ibs.
RMC 30S Accessory Studio Unit
3~" high x 19" wide x 7" deep
4 Ibs.
RMC 15T Transmitter Unit
31" high x 19" wide x 14" deep
11 Ibs.
RY IS R~lay Unit
3~" high x 19" wide x 14" deep
8 Ibs.
RY 30 Accessory Relay Unit
3~" high x 19" wide x 14" deep
8 Ibs.

Page 1-3
GLOSSARY OF TERMS
STUDIO UNIT--RMC lSS,found at the control point.
TRANSMITTER UNIT-- RMC 1ST, located at the main broadcast transmitter site.
RELAY INTERFACE UNIT--RY 15, used to connect transmitter functions to the RMC 1ST.
ACCESSORY STUDIO UNIT-- RMC 30S, used to increase number of channel commands.
ACCESSORY RELAY INTERFACE UNIT--RY 30, increases channels at transmitter site.
CONTROL-- The execution of commands given by the operator at the studio (remote
control), or at the transmitter site (local control) to produce changes
in the operating status of the equipment located at the remote site.
CONTROL POINT-- Any location that can be used to execute command of the remote
control system.
CONTROL LINK-- The wire line or radio system used to transmit commands from a
control point to the remote site.
TELEMETRY--Numerical and status information sent from the remote site to the
control point (studio).
TELEMETRY LINK-- The W1re line or radio system used to transmit telemetry from
the remote site to the control point.
8TL-- Studio to Transmitter Link, a radio link for transmission of program and
control information from the studio co the transmitter site, can be
used as a control link with the remote controL system.
T8L-- Transmitter to Studio Link, a radio link for the transmission of information
from the transmitter site to the studio site, telemetry link.
TELCO LINE-- Telephone Company Phone Line, can be used for the control and lor
the telemetry link.
IOENTIFIER-- Unit which identifies call sign of TSL as required by Law.
HIGH SPEED TELEMETRY--Telemetry returning in the form of audible tones.
SUBAUDIBLE TELEMETRY-- Telemetry returning in the form of subaudible tones.
INSERTION BOARD--Circuit used to inject subaudible telemetry toto main AM audio
or FM SeA audio.
SA--Subaudible, frequency range below normal hearing range, 0-50Hz.
AF--Audio Frequency, frequencies within normal hearing range, 50-20,000 Hz.
VOICEBAND--Frequency range of Telco Line, 300-3000 Hz.

Page 1-4
GLOSSARY OF TERMS ( CONTINUED)
VLF--Radio frequencies from 10 to 30 KHz., (10,000 to 30,000 Hz.)
LF--Radio frequencies from 30 to 300 KHz.
DPM-~Digital Panel Meter, found in RMC 1ST, converts analog meter inputs to
--- digital format prior to being sent as telemetry to the Studio Unit.
UART--Universal Asynchronous Receiver Bnd Transmitter, 40 pin integrated circuits
---- used to convert digital data from serial to paraLlel and/or parallel to
serial formats.
LOW TTL LOGIC LEVEL-- zero to O.8VDC.
HIGH TTL LOGIC LEVEL--l.S to 5.0 VDC.
DIGITAL-- Circuits which contain information in the form of High and Low levels,
frequencies expressed as squared or pulsed waves.
ANALOG--Circuits not restricted co logic levels, frequencies expressed as symetrical
non-square waves.
PARALLEL FOR}~T--Logic levels expressed in a number of circuits at the same time.
BCD--Binary Coded Decimal, four lines with values of 1,2,4, and 8 in which high
logic on certain conbinations of these are used to represent the numbers
from
zero to nine.
SERIAL FORMAT--Digital sequence in the form of a word beginning with a low level
start bit, followed by a series of information bits corresponding to a
number of parallel inputs, ending by a high logic stop bit, and may be
followed by high logic interval before next start bit.
DCD--Digital Data in Serial Format, Direct CUrrent Data.
FSK--FreQuency Shift Keying, uses alternate transmission of two adjacent fre-
--- quencies to represent high and low logic levels.
MODEM--Contraction of Mod and Demod.
MOD--Converts DCD to FSK, short ·for modulator.
DEMOD-- Converts FSK to DCO, short for demodulator.
RECEIVE OR TRANSMIT CLOCK--Digital Frequency at sixteen times the rate of the bits.
WORD--A serles of bits in the format LXXXXXXXXH, used as the control word.
DOUBLE WORD--A serles of bits 1n the format LXXXXXXXXHLXXXXXXXXH, used as the
telemetry word.

Page 1-5
GLOSSARY OF TERMS (CONTINUED)
WORD FREQUENCY--For the control, the transmit clock divided by 256. and for the
telemetry, the transmit clock divided by 480.
RESET PULSE--A pulse generated in the receiving circuit between every word or
double word demoded based on the length of the space between words
at which a high logic level is transmitted.

Page 1-6
TEST REPORT
OWNER CALL LETTERS. ___________ LOCATION. _____________ _
RMC ISS S/N _______ RMC 1ST S/N. _______ RY 15 S/N . _______ _
RMC 305 SIN RY 30 S/N _______ _
TYPE SySTEM _______ APPLICATION ____________ _
STUDIO UNIT CRYSTAL
KHZ TRANS. UNIT CRYSTAL
KHZ
CONTROL FREQS:
High
HZ
TELEMETRY FREQS:
High
HZ
Low
HZ Low
HZ
Clock
HZ Clock
HZ
CONTROL MOD NR
TELEMETRY MOD NR
TELEMETRY FREQS: FRF
HZ
CONTROL
FREQS: FRF
HZ
Demod
KHZ
Demod KHZ
TELEMETRY OEMOO
NR
CONTROL DEMOO NR
CONTROL
CLOCK
RATIO
TELEMETRY CLOCK RATIO
RMC 155
INPUT
LEVELS:
High
RMC 1ST INPUT LEVELS: High
Set
Set
Low
Low
OUTPUT LEVELS:
High OUTPUT LEVELS:
High
Set Set
Low
Low
MAXIMUM WIRELINE LOSS
dB
FAILSAFE TIME
SEC
DYNAMIC TEST BY INSPECTOR NUMBER ______ TEST DATE
SHIPPING OATE __________ _
3/9/81

SECTION II
INSTALLATION INSTRUCTIONS
INITIAL UNPACKING AND INSPECTION
Page 2-1
Unpack equipment immediately upon receipt and tboroughly inspect for concealed
damage. If damage is discovered, cease further unpacking and request immediate in-
spection by local agent of carrIer. A written report of the agent's findings, with
his signature is necessary to support a claim. Also, notify the factory of the dam-
age.
Check your shipment against the shipping papers for possible shortages. Do not
discard any packing material until all items are accounted for. Small items are
often thrown away with packing material. It may be desirable to store the shipping
cartons and their inserts in the event that the equipment should be returned to the
factory for repair or modification. The original packing materials would provide
the maximum protection. Insure return shipments.
PRELIMINARY TESTING
The Transmitter and Studio Units should be connected directly together by BNC
cable and/or lines to the 600 ohm inputs for preliminary testing. Refer to the
section On operating instructions for a description of normal functioning.
PLACEMENT OF EQUIPMENT
Install rack-mounted equipment 1n well-ventilated, grounded and shielded Metal
rack cabinet. Do not locate in a rack above tube-type equipment which produces high
temperatures, Or near equipment which has transformers that produce strong magnetic
fields.
All equipment including the remote control must be grounded to their racks.
The racks should be bonded together with wide copper strap which is connected to the
ground system of the site. Proper grounding and equipment placement can reduce or
eliminate induced hum and noise in all communi.catians cquipmE'~ l t.

Page 2-2
INSTALLATION INSTRUCTIONS, CONTINUED
PLACEMENT OF EQUIPMENT, Continued
The remote control equipment must be powered from a 3-prong grounded outlet
receptacle. Failure to use grounded outlets may result in a safety hazard or im-
proper operation.
The remote control units contain internal surge protection devices on the
600 ohm inputs and the 120V power lines. The remote control system should not be
expected to provide general protection for the entire collection of equipment at a
site, therefore it is necessary to provide for lightning and surges in accordance
with local codes, the National Electrical Code, and good engineering practices. COn-
formation to such legal and safety require~ents mandates the use of a qualified com-
petent engineer who through his experience can ensure that the overall site instal-
lation is proper.
If telephone lines are used, they must also be protected from lightning.
Consult your local telephone company for further assistance.
COMMUNICATIONS INSTALLATION
TYPE A--TELCO LINE SYSTEH--Attach a telephone line to balanced 600 ohm terminals
of both studio and transmitter remote control units.
TYPE ~--STL CONTROL/HIGH SPEED TELEMETRY--Run coax from ENe connector of studio unl
RMC 15S, to remote control input of STL transmitter, J1 or J2 on MARTI 5TL transmitters.
Complete the control link by running coax from remote contr01 output of the STL re-
cej.ver I J2 or J3 on MARTI STL rec.e:o.ivers J to the BNC connector of the remote cOot rol
transmitter unit, RMC 15T.
TELCO LINE TF.LEMETRY--Attach telephone line to balanced 600 ohm terminals on
both studio and transmitter units.
TSL TELEMETRY--Connect 600 ohm terminals On remote control transmitter unit,
RMC 15T to TSL transmitter according to instructions in TSL Transmitter Manual, and
to identifier according to instructions in Identifier Manual. Connect the T3L re-

Page 2-)
INSTALLATION INSTRUCTIONS, CONTINUED
COMMUNICATIONS INSTALLATION, Continued
ceLver audio output, TB-l terminals 1 and 2 of the MARTI R30/450, to the 600 ohm
terminals of the remote control studio unit, ~IC ISS.
seA TELEMETRY--Connect 600 ohm terminals of remote control transmitter unit,
RMC 1ST, to the SeA generator of the broadcast transmitter according to the man-
ufacturer's instructions. The FM Subcarrier Monitor may be used as the receLver
for demodulating the data required for remote metering. Connect the 600 ohm audio
output (0 DBM level) of the SeA monitor to 600 ohm terminals of the RMC-lSS unit.
A high quality crystal controlled SeA receLver may also be used to recover
the metering data from the 67 KHz subcarrier at the studio. Connect the 600 ohm
subcarrier audio output (0 DEN Level) of the receiver to 600 ohm terminals on the
RMC-lSS.
TYPE C--STL CONTROL/SUBAUDIBLE TELEMETRY--Run coax from BNC connector of studio
unit, RMC-ISS, to remote control input of STL transmitter, Jl or J2 on MARTI STL
transmitters. Complete the control link by running coax from remote control out-
put of the 5TL receiver, J2 or J3 on MARTI STL receivers, to the BNC COnnector of
the remote control transmitter unit, RMC-l5T.
A 50 Hz
high pass filter must be inserted Ln the audio line before the limiter
to remove frequency components that could interfere with the telemetry carrier. If
a Marti R-200/9S0 STL Receiver ~s used, a LA-20/HPF-SO amplifier can be substituted
in place of the regular 1A-20 amplifier module to accomplish this filtering. If the
sub-carrier is received over the ST1 by a Marti SCR-8 Receiver, the filtering 1S
accomplished by substituting the Lk20MPF-SO for the LA-20 Ln the SCR-8. A similar
substitution can be made if a CLA-40 or PGM-20H is used in the scheme delivering the
audio with which the subaudible telemetry will be mixed.
Mount the insertion board in a convenient location. Connect terminal 7 to the
Ground terminal of the remote control transmitter unit, RMC-1ST, terminal 8 to the

Page 2-4
INSTALLATION INSTRUCTIONS, CONTINUED
COMMUNICATIONS INSTALLATION, Continued
Common terminal, and terminals 5 and 6 to the 600 ohm terminals of the remote
control transmitter unit. Connect terminals 1 and 2 to the audio line pre-
viously connected to the AM modulator or SCA audio input. Connect terminals 3
and 4 to AM transmitter audio input or SCA audio input.
AM SUBAUDIBLE RECEPTION--The AN Modulation Monitor or a high quality AM Re-
ceiver may be used to demodulate the AM signal to a composite audio signal upon
which the Bubaudible FSK carrier has been inserted. The audio response of the
monitor or AM receiver must be flat to 20 Hz in order to properly pass the sub-
audible signal. Some modern monitors have a subaudible output which roay be used
to feed the RMC-lSS.
FM SUBAUDIBLE RECEPTION--The SCA Generator 1n the transmitter should be
switched to Automatic Muting so that either the background music or the subaudible
tones will turn on the seA Generator.
The FM Subcarrier Monitor may be used as the recelver [or demodulating the
data required for remote metering. Connect the 600 ohm audio output (0 DBM level)
of fue SeA monitor to 600 ohm terminals of the RMC-lSS unit.
A high quality crystal controlled SCA receiver may a1ao be used to recover the
metering data from the 67 KHz subcarrier at the studio. Connect the 600 ohm sub-
carrier audio output (0 DBM Level) of the receiver to 600 ohm terminals on the
RMC-15S.
COMMUNICATIONS ADJUSTMENT
INPUT AND OUTPUT CONTROLS AND . INDICATORS--Input and output controls are multi-
turn pots which may be adjusted with either a standard alignment tool, or suitaule
small screwdriver. The output level indicators reflect output voltage with load. A
no-load condition will cause it to read higher than normal, and a short or low-Z COn-
dition will cause the output to read "LO" regardless of adjustment. The input level
indication is derived from the incoming signal. In the presence of acceptable,
characteristic control word patterns, the inpllt level indicator of the transmitter

INSTALLATION INSTRUCTIONS, CONTINUED
COMMUNICATIONS ADJUSTMENT, Continued
Page 2-5
unit, IlliC-1ST, will be "SET" regardless of true input level. In Type C Systems,
the input level indicator of the studio unit, the RMC-1SS, 15 relative to the sub-
audible frequency component of the incoming signal.
CONTROL OUTPUT LEVEL ADJUSTMENT--Unless otherwise instructed, adjust the out-
put h : vel of the remote control studio unit, RMC-1SS, to the middle of the "SET"
range. Counting turns will help you find the mid-point.
CONTROL INPUT LEVEL ADJU5TMENT--Turn the input level on the remote control
transmitter unit, {{MC-IST , down to a "LO" indication. Turn the input level adjust-
ment clockwise. three or four turns beyond where the "SET" level is first indicated.
TELEHETRY OUTPUT ADJUSTMENT--In normal operation, telemetry is on in all
channels other than channel zero.
TYPE ~--Adjust the output level of the remote control transmitter unit, RMC-
1ST, to the midd le 0 f the "SET" range for 0.8 VAC RMS.
TYPE ~ - -For wire-line telemetry, adjust telemetry output as in Type A above.
If using SeA, consult the manufacturer's instructions for input requirements and
adjust the output level while monitoring the input terminals of the SeA generator
with an external voltmeter. For TSL adjust the output level to middle of set range.
Consult TS1 Manual for instructions on setting of modulation level.
TYP£ f--With no program audio, set the subaudible carrier level using the
station modulation monitor. This is 6% on an AM station and 25% (1KHz deviation)
on a 67 KHz SeA subcarrier. Do not depend On the output indicator of the remote
control because this indication mayor may not be appropriate. Restore normal pro-
gram audio and adjust the "ATTEN" pot on the insertion board for 8S% maximum negative
peaks On the AM station monitor or 857. 0.4 KHz Deviation) of FM SeA. In channel zero,
modulation characteristics should be normal.
TELEMETRY IN PUT AOJUS TH ENl'
TYPE ~--With telemetry on, turn studio unit input pot down to a "LO" indication.
Turn th e input level adjustment clockwise several turns beyond where the "SET" level

Page 2-6
INSTALLATION INSTRUCTIONS, CONTINUED
COMMUNICATIONS ADJUSTMENT, Continued
is first indicated.
TYPE B--For wire-line telemetry, adjust telemetry input as in Type A above.
For FM subcarrier monitor, seA receiver, or TSL receiver, adjust input to 600 ohm
terluinals of remote control studio unit to .25-1.00 VAC RMS. Adjust telemetry io-
put as ~o Type A above.
TYPE C--From the AM Modulation Monitor or high quality AM Receiver feed the
composite audio signal at 0 DBM level into the 600 ohm terminals of the studio
unit. Adjust studio unit, RMC-l5S, input to middle of "SBT" range. Indicator
should show "LO"if channel zero a selected'. Display should update every 4.8
seconds. Over-modulation of AM transmitter may cause garbled data. If numbers are
sent while meter ~s ranglng, the operater . may also see wrong figures. Wait several
seconds with each reading to see that the meter has stabilized.
GENERAL COMMENT ON COMMUNICATIONS
Non existant, poor, or marginal communications links will prevent the remote
control from operating. Additional testing of the links to aSSure that they are
intact and of adequate quality may prove necessary to preclude a communications
problem. Good engineering pract1ces including proper grounding, use of shielded
cables, labeling of wires which might be disconnected and routine inspection of
connections will solve a host of problems.
INSTALLATION OF RY 15 RELAY INTERFACE UNIT
The Ry 15 should be connected to the RMC-lST with the ribbon cable provided.
Either PI or P2 on the rear of the RMC-15T may be used since these contacts are in
para He 1.
The RY 15 Relay Interface Unit is used to physically output channel selection
through dry concacts, output raise/lower functions, and serve as an input port for
data samples. The contacts for each of these operations are made through l6 p~n
blue-ribbon connnectors excpet for channel zero which uses a terminal strip. Th~
channels are grouped three to a connector, l-2-3, 4-5-6, 7-8-9, 10-11-12, 1}-14-15,

Page 2-7
INSTALLATION INSTRUCTIONS! CONTINUED
INSTALLATION OF RY 15 RELAY INTERFACE
UNIT,Continued
and each connector uses the
following code:
DATA
CHANNELS
RAISE
LOWER
COMMON
POS.
NEG
---
1,4,7,10,13
1 2 3 4 5
2,5,8,11,14
6 7 8 9 10
3,6,9,12,15
II 12 13 14 15
The five connectors for a RY 15 are all interchangeable. The harness wires
to user equipment should be carefully soldered to the plugs, with sleeving over
each terminal ta reduce chance afShorting adjacent pins. After attaching all
necessary wires ta a given connector, bundle the wires together and tape Or tie
them to reduce strain on individual pins. The contacts 1n each plug are recessed
to reduce chance of shorting when disconnected from the RY 15.
The connections for channel ZERO are found On the terminal strip and have the
same numerical key as the pins for channel one. Channel zero may be used as a con-
trol and data channel, but remember that the telemetry is normally off on that channel.
CHANNELS 1-15 PROGRAMMING MODE--Each group of tbree channds is isolated for
use ~n single channel selection programming schemes. In such a configuration, the
source voltage is connected to pin 16 and the command leads are attached to plns 3,8,
and 13 respectively for the three channels.
CHANNELS 1-lS RAISE/LOWER MODE--Ta enable the RAISE and LOWER functions for a
given set of three channels found on the same connector, connect pin 16 of that
connector to terminal strip position 6. The circuit in this mode goes through the
fuse found on the front panel of the RY 15. Channel zero raise/lower circuits are
already internally connected to the relays.
VOLTAGE SAMPLE INPUTS--Channels ZERO through 15 each have an input pair for DC
VOltages. See the table below for positive and negative identified pins for COnnec-
tion. Reversing the leads will cause a negative reading which may be desired 10
reading specified voltages. The sample should be between 2 and 2.5 volts for full
scale readings of up to 1999, positive or negative. If the proposed sampl~ is too

Page 2-8
INSTALLATION INSTRUCTIONS, CONTINUED
INSTALLATION OF RY 15 RELAY INTERFACE UNIT, Continued
large, use a serles dropping resistor of about a thousand ohms per volt with a
shunt resistance across the data inputs of about two thousand ohms to divide the
sample down to the required voltage. Sample voltages greater than about a couple
volts will be difficult to set. If the voltage sample is too low for a good
reading, less than 1 volt for a reading of 1000, a DC amplifier may be required.
Attempt to increase the sample by other means if practical. The data circuit is
floating, therefore the sample need not be referenced to ground, but may be several
hundred volts above or below ground potential. Sample lines should be bypassed to
ground at their source with 0.001 mfd capacitors and conveyed to the remote control
1n shielded cables. Ground both ends of the shielded cable directly to the frame
of the source and the ground terminal of the RY 15.
For each channel the input voltage to the transmitter unit from the RY 15 is
adjusted with a ten-turn pot found adjacent to each channel. The disptay on the
transmitter unit will blank if overrange; the studio unit will show the numb e rs
111999/1 under" the overrange condition.
GATES TRANSMITTERS
Some Gates (Harris) Broadcast Transmitters are not equipped with all relays
necessary for remote control by modern systems. Order relay assembly from ~arti
Electronic's Remote Control Equipment List that specifies use with Gates "H" and
"H3" series transmitters.
POTOMAC AM-l9 ANTENNA HONITOR
The Relay Interface Units of "the RMC 15 System are full compatible with thc
popular AM-19 Antenna Monitor. Each group of three channels can be isolated in the
programming mode for specific use with the Am-19.
Before attempting the interfacing of the remote control to any antenna monitor,
refer to the appropriate literature of that instrument specifically sectio: ls deal ing
with "remote control" and "auxiliary connections".