[ARC5] Photograph th the complete 1932 SCR-AA-183...First of 21 Sets In This Series

[k1uhy at comcast.net]

The 1929 RCA auto radios had a similar shape format as did Zeniths under the front seat 32 Ford version; both ran dynamotors. The Ford version goes for a lot more than the T-16 

----- Original Message -----

From: "Mike Morrow" <kk5f at earthlink.net> 
To: arc5 at mailman.qth.net, milsurplus at mailman.qth.net 
Sent: Wednesday, August 17, 2016 11:04:53 PM 
Subject: [ARC5] Photograph th the complete 1932 SCR-AA-183...First of 21 Sets In This Series 

Photograph of the complete 1932 SCR-AA-183 (first of 21 different such sets) is attached. 

SCR-AA-183 14 VDC [Items with * are also part of SCR-AA-192, SCR-202] 

Made by Aircraft Radio Corporation, Contract SC-132311, 06-25-1932 

BC-AA-179* Receiver 
BC-AA-180 Transmitter 
BC-AA-181* Receiver Control Box 
BC-AA-182 Transmitter Control Box 
BD-AA-69* Dynamotor Unit: 14 vdc IN, 235 vdc OUT 
TM-AA-153* Junction Box 

Receiver Coil Sets: 
C-97 224- 448 kHz 
C-101 2500-4700 kHz 
C-102 4150-7850 kHz 

Transmitter Coil Sets: 
C-115 6200-7700 kHz 
C-119 3050-3800 kHz 

RECEIVER: Tuned Radio Frequency 
Modes: KEY (A2)/MIC (A3) (no mode switch) 
Receiver Stages: RF AMP1, RF AMP2, RF AMP3, RF AMP4 4x(VT-36 –> 36) 
DETECTOR/AGC (diode connected) (VT-37 –> 37) 
AF AMPLIFIER (VT-38 –> 38) 
Loop Connection: None 
AUTO/MANUAL Gain: AGC is applied to first two RF amplifier stages. 
MGC is applied to first three RF amplifier stages. 
In AUTO, INCREASE OUTPUT changes receiver audio output 
and transmitter side-tone level in headphones. 
Screen Volt Divider: In dynamotor unit 
AF Output Impedance: HIGH or LOW selected by internal wiring 
AF Low Pass Filter: In AF transformer primary 

TRANSMITTER: Master Oscillator-Power Amplifier 
Modes: REC(eive), (transmit) KEY (A2), (transmit) MIC (A3). 
Power Output: 1.5 watts 
Transmitter Stages: MASTER OSCILLATOR (VT-25 –> 10) 
POWER AMPLIFIER (VT-25 –> 10) 
PA PLATE MODULATOR (VT-52 –> 45Spl) 
TONE OSCILLATOR (VT-25 –> 10) 

- The transmitter coil set consists of two physically separate coil assemblies: 
Master Oscillator – Plug-in, but requires removal of transmitter case 
to change. 
Antenna - Plug-in. May be removed from the left side of the 
assembled transmitter to adjust antenna load coil. 
- Coils C-101 and C-119 are not normally supplied. 
- The SCR-AA-183 is the earliest production military Model D set. 
- This is the only receiver in the series that uses tube VT-36 in the RF 
amplifier stages. 
- This is the only transmitter in the series that does not provide CW (A1) 
transmission. 
- This is the only transmitter in the series that does not provide push-to-talk 
transfer from receive to transmit. The REC-KEY-MIC switch on transmitter 
control box BC-AA-182 is used to switch between REC(eive) to (transmit) KEY to 
(transmit) MIC functions. The key is part of control box BC-AA-182. 
- There are no receive-transmit circuit or antenna switch relays in this system. 
- Separate receive and transmit antennas are required. 
- This set was intended to use keyed A2 MCW (KEY) rather than A3 voice (MIC) as 
the principal operating mode. Thus, the transmitter mode/transmit-receive 
switch first selects KEY from the REC(eive) position, and then MIC. 
- Dynamotor BD-AB-69 may be used in place of BD-AA-69. 

Mike / KK5F 
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