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.