C47 communications

Communications

The C-47 I am building will have the same radio’s and comms equipment as in the war. There were 4 different kind of comms equipment.

First the Inter-phone. It was like an intercom. Housed at all 4 workstations, i.e.. Pilot, Co-pilot, Radio-operator and Navigator, the crew could communicate with each other, listen to the radio’s and broadcast as well. The inter-phone used was the RC-36. It had the following parts:

BC-347 Inter-phone Amplifier

BC-366 Jack Box, 1 at each crew station so 4 in total

SW 109 “lollypop” microphone at each station

a headset at each station. Those could vary in type

PE-86 Dynamotor to supply the power for the whole set

The Inter-phone set is complete. I only lack a couple of headphones.

BC-347 Amplifier with 2 BC-366 Jack Boxes PE-86 Dynamotor

SW-109 Microphone

Headset

Second was short range radio-traffic. The sets used were called Command Sets or SCR-274-N

These were made up of:

2 Transmitters. 25 Watts output on CW
3 Receivers

Type: One BC-458-A Transmitter 5.3 - 7.0 Mc
One BC-459-A Transmitter 7.0 - 9.1 Mc

Type: One BC-453-A receiver 190 - 550 kc
One BC-454-A receiver 3000 - 6000 kc
One BC-455-A receiver 6000 - 9000 kc

Accessories:

DM-33-A Dynamotor for transmitter
DM-32-A Dynamotor for receiver
FT-226-A and FT-227-A mounting rack for transmitters
FT-220-A and FT-221-A mounting rack for receivers
BC-456-A Modulator Unit
FT-225-A Mounting for Modulator
BC-451-A Transmitter Control Box
FT-228-A Mounting for Control Box
BC-450-A Receiver Control Unit
BC-442-A Antenna Relay Unit
I-71-B Antenna RF Ammeter

Still not complete but getting there:

BC-457 and BC-458 on the FT-226A rack, unmodified, good condition, missing two plugs

BC-454 and BC-455 on the FT-220 rack, unmodified, fair to good condition, no dynamotors, all plugs present.

BC-456 Modulator Unit. Came with the radio station, fair condition, all plugs present

BC-451, Receiver Control Box, good condition all plugs present

BC-442-A Antenna Relay Unit. Complete, good condition

Third is a system for long range communication. Used for aircraft-to-ground or aircraft-to-base communications. Called the Liaison set, SCR-287.

It had the following parts:

1 Transmitter on radio operator's table, type: BC-375-D Transmitter - 200 kc 12,500 kc with seven tuning units. 40 to 75 watts output depending on which tuning unit is used.

1 Receiver on radio operator's table, type: BC-348-H receiver - 1,500 kc to 18,000 kc

Accessories:

TU-26 Tuning Unit 200 to 500 kc
TU-5B Tuning Unit 1,500 to 3,000 kc
TU-6B Tuning Unit 3,000 to 4,500 kc
TU-7B Tuning Unit 4,500 to 6,200 kc
TU-8B Tuning Unit 6,200 to 7,700 kc
TU-9B Tuning Unit 7,700 to 10,000 kc
TU-10B Tuning Unit 10,000 to 12,500 kc

CS-48 Storage Boxes for Tuning Units
PE-73-C Dynamotor Unit
J-47 Morse Key Unit
RL-42 Antenna Reel
MC-163 and F10 Antenna Fairlead and Trailing Antenna
BC-306 Antenna Tuning Unit
SCR-211-D Frequency Meter
BC-461 Antenna Reel Control Box
X41-B10A16 Antenna Switch

BC-357. Cabinet only. Outside complete, inside completely empty. Awaiting replacement

Tuning Units. Missing TU-26

BC-348-Q. Modified to 110 Volt, missing dynamotor. Slight modification to the front. Will be rectified.

J-47 Morse Key

SCR-211, Frequency Meter. Good condition, missing canvas-bag.

Fourth are the electronic navigational aids. On this C-47 that consists of 2 systems:

Radio Compass Receiver SCR-269-C System, used for direction finding and cross-country navigation.

Type: One BC-433C receiver (200 to 1750 Kc)

Accessories:

Two BC-434-A Remote Control Boxes
Three MC124 Flexible Shafts
One MC-203 Flexible Shaft T connector.
I-81-A Pilots Indicator
I-82-A Navigators Indicator
BK-22-A Relay Terminal Panel
LP-21-A Rotatable Loop Antenna
CD-365 Antenna Cord