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RT695A - PRC-41
Manpack UHF transceiver
Power Supply
PP-3700
Either the battery or the ac power supply can be attached to the RT695.
Both have the same size (28 x 10.5 x 19 cm) and weight ( 7.5 kg)
The battery must be charged with a special charger, not this PP-3700
1963
Receiver-Transmitter
RT-695 / PRC-41
size 28 x 10.5 x 35 cm
weight 10,5 kg
Battery
BB-451/ U
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Related Manuals for Racal Instruments RT695A
Summary of Contents for Racal Instruments RT695A
- Page 1 RT695A - PRC-41 Manpack UHF transceiver 1963 Receiver-Transmitter RT-695 / PRC-41 size 28 x 10.5 x 35 cm weight 10,5 kg Battery BB-451/ U Power Supply PP-3700 Either the battery or the ac power supply can be attached to the RT695.
- Page 2 PRC-41 REFERENCE DATA a. POWER REQUIREMENTS. - 26.5 volts dc+10 percent (equipment will operate with an input voltage as low as 22 volts dc)or 115 or 230 volts ±10 percent, 50-to-400-cps single phase. Equipment is normally connected for 115 volts; cable re-fabrication is required for operation from a 230-volt source.
- Page 3 Transceiver Like the ARC51, The RT695 is a triple superhet with fully crystal controlled channels. Differences to the ARC51 are: Manual control, no crystal oven, simplified squelch circuits and only 2W RF output. Versions: The RT695A has a slightly modified audio circuit to allow voice encryption using the external crypto unit KY-38 Battery The battery has 16 silver/ zinc oxide cells, filled with potassium hydroxide (KOH).
- Page 4 Interconnections between modules and power supply POWER SUPPLY Q1 . MODULE 2N1486 +180V 800 Hz 1H /57 MODULATOR 470k 2µF 3µF 1N649 AUDIO -6.8V Q2 . 15µF 26 V 1N159 2N1486 1mH/ 1 Push 140mA relays to talk 33uF BB-451/U TR/G squelch LIGHT...
- Page 5 Module circuit diagrams +24.5V on Xmit +26.5V on Xmit 52 mA bias 2x 5 +180V Q1 . 2N1486 mike bias 2x 180 10nF Z=3k To RF carbon 5.6u AMPL mike 10nF Q1,Q3 input 1Vpp in for 2N1486 150k 300Vpp out Class B side 320Vpp clip...
- Page 6 +190V modulator +125V (Rx) / 190V (Tx) RF AMPLIFIER ( A8 ) 225-400 MHz J9-J10 +133V 45mA spare +190V 6442 7554 7077 7554 7077 +26V on Tx 2N1481 +24V 470 p 470 p 20 p 0.22 500 p 500 p 1.0 V 1.7V -AVC...
- Page 7 +25V / 30mA + AVC 100k 2N915 3N35 3N35 2nd IF filter 2.9 – 3.9 MHz 500kHz output 22pF Signal to third IF 3N35 2N338 1 pF 2.7uH 5 pF 100p 150p 220p 180p 47pF 20pF Coils 26V /40mA 100p 100k 100p 100k...
- Page 8 2N697 +27V / 50mA +19V input 22uF 1N3027 3N35 3N35 3N35 3N35 3N35 2N917 2N918 squelch 243 MHz 0.5p 2N918 20.56 MHz 180p 222.44 MHz Tuneable from 239 – 248 MHz +19V +19V 0.33 2N329 4.7u 150k 1N231 +6.2V 1N457 2N329 2.2u doubler...
- Page 9 2N2219 2N161 3N35 3N35 +15V 24.5Vdc 0.5mH 10uH 2.2uF 220p Aux audio 220p 1N483 Audio 4.7uF auto relay NOISE 2.2uF LIMITER 0.1uF CONTROL 2N2905 2N2219 2N2905 2N1613 +24.5V on Rx - AVC DELAY °C 2N2905 reserved for squelch disable 500kHz 100k 10uF - AVC...
- Page 10 PP3700 mains power supply for PRC-41 60V peak Q3 . 48V average 2N2113 26.5V / 4A 100u 100u 100u 80mH/ 5A 2x 4.2 1.6AT 2x 33uF Q4 . Q2 . 115V 2N697 2N1896 Q1 . 660uF 2N1893 RT695 PRC-41 115V 1.6AT 1N249 33uF...
- Page 11 The basic PRC-41 has two of these 10-way connectors, all pins are connected in parallel. The PRC-41A only has one 10-way connector. The other one is a 19-way connector which connects to a Nestor KY38 speech scrambler. Added are two Collins "opamps" in the RT695A/PRC-41A 10nF to H 10uF tel.
- Page 12 Antenna filter in the PRC-41 BAND PASS FILTER 225 - 400 MC PN 241 - 0467 - 00 model 5364 BIRD ELECTRONIC CORP. CLEVELAND, OHIO 600 MHz Rx / Tx antenna mini...
- Page 13 Watt- Hour/Pound .... Watt-Hour/Cubic Inches.. 4. 4 Voltage Regulation ..Good Discharge Rate (Maximum, Amperes) 25 A Cycle Life (Cycles) ..10-30 The input current of the RT695A / PRC41 is 1.9A in receive mode, or 3.1A in transmit mode.
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Page 14: Functional Description
b. FUNCTIONAL DESCRIPTION. The battery when charged, has positive electrodes of silver oxide and negative electrodes of metallic zinc. During discharge the positive plates are reduced to silver while the negative plates are Oxidized to zinc-oxide. Charging the battery reverses this process (returns It to the charged state). The electrolyte acts as a medium for the exchange of Oxygen, and is also the current carrier within the cell.