RS-19 HISTORY OF DEVELOPMENT

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A000800020036-4
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: February 16, 2012
• Sequence Number: 36
• Content Type: MISC

Declassified in Part - Sanitized Copy Approved for Release 2012/02/16: CIA-RDP78-03424A000800020036-4
RS-19 HISTORY OF DEVELOPMENT
J-i
1. Contract initiated 20 June 1957 and to run for 18 months, cost $97,401.61
Program layed out into two phases
2. Phase A. Delivery of RS-19 prototype system effected on 17 July 1958 to
demonstrate feasibility of the basic design concepts.
NOTE:
a. System consists of FM Transmitter, FM Receiver,) 25X1
AM Retransmitter, Battery Charger. 25X1
b. Investigations were conducted for optimum frequency and Antenna selection.
Through 3.5 a to 7 me provided greater range of communication than 14 mc,
35 me and 156 mc.
c. Modulation Selection - Single sideband - FM and AM techniques
Considering all problems - battery drain and life, range, size of equip-
ment, simple circuitry, ease of operating and reliability, FM was selected.
d. Audio Transducer Development - Air approach - air core audio transformer
2 watts required in primary to develop 1 mw in the mouth receiver, - efficiency
of this system was very poor.
Second approach - re-transmit audio to mouth 330 kc AM transmitter -
efficiency was good.
FM Receiver - 2 RF stages, mixer, crystal controlled OSC. L-C-455 kc
bandpass, filter, six IF amp. one limiter, discrimination, two audio amp.
SQUELCH circuit. 6 volt battery pack.
Size - 2" x4.6" x .8"
Weight - 6.25 ozs.
Sensitivity - 35 my or less for 20 db quieting
Operating Time - 24 hours squelched
12 hours unsquelched
330 kc retransmitter draws power from receiver
Battery pack - 25 ma
Size - .75 x .8 x 4.6 inches
Weight - 1-3/4 ozs.
Operating Time - 24 hours squelched
2 hours unsquelched
De ctor diode
Transistor Aduio Amp.
Transducer e~` 4,vo
Loop Antenna
@6G ~Ea~ 904 9~~c3~7[--~~
9166 GL -%3-- PhUnS 9 M 8LA 3F t
JUST a L amw acv y Auwa Igca j?.,25X1
Battery Life - 16 hours under signal conditions
Declassified in Part - Sanitized Copy Approved for Release 2012/02/16: CIA-RDP78-03424A000800020036-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/16: CIA-RDP78-03424A000800020036-4
FM Transmitter 6.980 MC ?4 KC deviation
Size: 7.5 x 4.5 x 1.375 inches
Volume: 47 cubic inches
Weight: 2u lbs.
Power out: 24 watts
Battery Life: 30 minutes
Voice modulated
Audio tone modulated (last two audio stages connected into oscillator by
feed back line 1000 cycle tons.)
3B4 final amplifier includes 2 watts RF
DC-to-DC converter: 12 volt battery pack
1. Complete transistorization
2. Improve design (reduce size)
3. Battery packs separation from electronics but still contained in
individual equipment case.
4. 2 watts RF output using two Fairchild 2N696 transistors in parallel.
5. Battery voltage for transmitter is 30 volts. This is necessary to
obtain 2 watts RF output and also eliminate DC-to-DC converter.
6. Telex contrast for mouthpiece development $9,800 10 units plus 2
prototypes.
Transmitter size approximately 5-5/8" x 2-7/8" x 1-1/8"
Receiver same size as Phase A
Delivery date: 1 April - 2 transmitters - 1 receiver, 1 remote control,
1 mouth receiver.
,We are to send) One of the Phase A FM receivers for k returning
and possible repair - This will then give us a complete set in which to
operationally test the prototype of Phase B. Battery transmitter one-half
hour. Receiver 24 hours. Charge: 19 hours.
Battery Charger - Magnetic amplifier regulated power supply
Operates from -70 to 270 VAC 40-60 cycle.
Two position switch (70-135 VAC) 135-240 VAC)
This equipment will regulate up to 300 VAC as noted by tests at contractor.
consists of a saturable reactor, power transformer, bridge rectifier and
control circuit.
Charging rate: constant current
Transmitter 12V at 36 ma - 22 hrs.
Receiver 6 V at 9 ma - 18 hrs.
rechargeable nickel-cadmium batteries can be charged in excess of 90 days without
harmful effect.
? tl l , ! w 7
Declassified in Part - Sanitized Copy Approved for Release 2012/02/16: CIA-RDP78-03424A000800020036-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/16: CIA-RDP78-03424A000800020036-4
Test Equipment
used to tune loading coils of the transmitter and receiver
switch in transmit position acts as an absorption meter for tuning transmitter
loading coil.
Swithc in receiver position, generates as signal 6.980 me for loading coil
of receiver 18" antenna
Cost and Availability of RS-19:
Tube: 1108 each
Transistor 1318 each
delivery 6-9 months.
IGO
Declassified in Part - Sanitized Copy Approved for Release 2012/02/16: CIA-RDP78-03424A000800020036-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/16: CIA-RDP78-03424A000800020036-4
R5 -19
BASE RADIO STATION
This equipment consists of a transmitter and receiver with two seperate power
suppl4es. 1. DC-to-DC Converter and 2. AC Pwoer Supply.
Emission designation is F-2 (tone CB) and F-3 (Voice*
Transmitter characteristics Keying - Hand speed and upto 300 wpm w/external equip.
Size - 22 8 x 6 x 22 inches approx.
Weight- Nix approx 10 lbs.
Power output, 25 watts RF
Frequency range - same as RS-19 field unit
necessary for
Controls - Minimum amount
simplicity of
operation.
Antenna. - Whip with base mount.
Operation - mobile and fixed loaction.
Crystal controled with six crystal positions provided.
Receiver Characteristice
Size - 8 x 6 x 22 inches approx.
Weight - Approx. 10 lbs
Sensitivity - better than the FM receiver of the field unit (RS-19)
Crystal control - Six crystal positions are available
Tuning - One tuning control will be provided for tuning the RF states of the
receiver.
Internal speaker provided
controls - volume control, squelch control, ON/OFF power control.
connected
Output jacks - Audio output in which a actuating d&vtce may be gVM%f /
for controlling the ON/OFF function of a tape recorder.
Power supply
AC Power sypply - operating ac voltages are 110/220 volts ac, 50/56 cycles
will deliver dc operating voltages to transmitter and receiver.
DC-to-DC converter - Operating from 12Avoltss.DCsupplying dc operating voltages
Declassified in Part - Sanitized Copy Approved for Release 2012/02/16: CIA-RDP78-03424A000800020036-4