BC-348-P

Radio, telefonia , telegrafia y equipos de transmision y recepcion, utilizados en los vehiculos militares

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BC-348-P

Notapor Diego » 27 Feb 2013, 18:04

Que prolijidad..esos cables!,y despues de tanto tiempo !como nueva!!

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[IMG]http://imageshack.us/a/img823/7582/ndhstx016.jpg[/IMG
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Tiene unas modificaciones,le falta el dinamotor,tiene un trafo.
Saludos
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Diego
 
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Notapor m606paz » 27 Feb 2013, 19:02

Ese GPW merece una radio para Jeep, no un receptor para Avion!! :lol: :wink:
Mariano Paz
Socio n°27
1944 Ariel WNG
1945 Ford FAT
LU4ALM
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Notapor Diego » 27 Feb 2013, 19:22

Of course Mariano,pero para comunicarse con los P51,la usaron tambien!! :D
http://usaaf.co.uk/forum/viewtopic.php?f=9&t=98
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Notapor m606paz » 27 Feb 2013, 20:35

Mariano Paz
Socio n°27
1944 Ariel WNG
1945 Ford FAT
LU4ALM
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m606paz
 
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Notapor Diego » 28 Feb 2013, 16:53

Follow jeep?..bueno ..pero tambien AACVM compraria 2 P51 no? (jaja)
Tengo algo mas,no se si corresponde a la BC 348,pero aparentemente son de WW2. :roll:


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Las tres primeras son de mis Headphones,me faltaria el cable original,el plug lo tengo..valen en Ebay US 34 +- y son bastantes raritos de encontrar. No estan en venta eehhh :D
Saludos.
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Notapor Diego » 28 Feb 2013, 16:59

The BC-348 Aircraft Receiver was designed by RCA in the late thirties. It was an updated version of the earlier BC-224 12 volt version that RCA designed in 1935. As aircraft power systems developed, the change-over to 28vdc systems was taking place by the late-thirties. At the time the BC-348 was introduced, the BC-224 was also upgraded to have the same external appearance. The BC-348 operates on 24-28vdc with the high voltage (~+220vdc) provided by an internal dynamotor. Many tens of thousands were built during WWII by many different contractors building many different versions within that time period. The "Early" circuit used eight tubes with the heaters originally wired in series-parallel for 24vdc operation (two parallel strings of four 6 volt tube heaters in series would operate on 24vdc.) The "early" circuit provided two RF amplifiers, a Mixer, a Local Oscillator, an IF amplifier stage, a combination 2nd IF amp and BFO, a combination 3rd IF amp and Detector/AVC followed by a type 41 audio output stage (this was changed to a 6K6 in some later versions.) Early versions also will have a 991 neon lamp acting as a regulator on the local oscillator and will provide an antenna trim control. A selectable crystal filter was also included in the circuit. The dual dial lamps were adjustable for brightness and were wired in series through a potentiometer and fixed resistor. Frequency coverage was from 200-500kc (not on the B or C version) and 1.5-18mc. The audio output impedance was internally selectable at "low Z" which was around 300 Z ohms or "high Z" which was around 4000 Z ohms. Some BC-348s will have a decal on the front panel indicating if the "low Z" was optioned.

During the middle of WWII, the BC-348-J, N and Q "Later Version" of the receiver was introduced. This new version had to be interchangeable with the earlier BC-348 so physically both versions appear almost identical. Inside, however, several changes were made to reduce the cost of building the BC-348 but still maintaining its high level of performance. The "later" version reduced production costs by simplifying the construction and component mounting which additionally made depot repairs of these "later" receivers much easier. The "later" circuit used two RF amplifiers, a converter stage, three IF amplifiers, a duplex diode/triode provided Detector, AVC and BFO functions and a 6K6 provided the audio output.

When the receiver was installed on its FT-154 shock mount and installed in the aircraft, an eight pin Jones plug mated with a receptacle and cable that exited from the rear of the mount containing the 28vdc input, the remote stand-by relay function and an audio output line. The BC-348 was generally interconnected with the transmitter to control boxes allowing the transmitter's control relay to provide antenna switching, receiver stand-by and providing side tone monitoring which allowed for full "break-in" keying.

Since there are so many variations, military radio collectors have generally divided the BC-348 into two groups, "early" types (B, C, E, H, K, L, O, P & R) referred to as the "Grid Cap Tubes" version and the "later" versions (J, N & Q) referred to as the "Single-Ended Tubes" version. Many different contractors built BC-348s but Wells-Gardner Co. probably built the greatest quantity of receivers and is the most commonly seen contractor-manufacturer. Estimated production of the entire BC-348 line exceeds 100,000 receivers making it one of the most commonly found WWII aircraft receivers today
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