[MRCA] Australian WSA-38

[Al Klase]

Well, it reminds me of the BC-611 handi-talkie (Motorola).  Five tubes 
and a big slide switch that runs the length of the set to turn 
everything around.


Apologies for the fuzzy schematic.
Al

On 5/4/2018 10:37 AM, Ray Fantini wrote:
>
> A friend just picked up an Australian WS-38 transceiver. Just for fun 
> I went out and pulled the schematic on the set being I never saw one 
> before and have to say that it may be the most complex and difficult 
> design that I have ever come across for a small field radio. It has 
> just five tubes and uses a couple tubes for different functions such 
> as V1A as the mixer for the receiver and also as the modulator for the 
> transmitter, V1B is the oscillator in both receive and transmit has 
> its plate tied to V1A, V1C is the first IF amplifier and that along 
> with the RF power amplifier V2A are the only two tubes not doing 
> double duty.  My favorite has to be V1D that’s not only the second IF 
> amplifier it’s also the receiver audio amplifier and just for good 
> measure serves as the microphone preamplifier in transmit.  These are 
> not multipole tubes in one envelope but just regular pentodes that in 
> the case of V1D are being an IF amplifier and audio amplifier at the 
> same time.
>
> The layout of the set is compact and it looks like it would be an bear 
> to work on it along with the fact that unlike just about everything 
> else in the world where each tube would be labeled V1 for the first 
> tube, V2 for the second and so on they just use V1 A, B, C and D to 
> reference the tubes with the only tube getting the honor of a new 
> number being the PA tube referred to as V2.
>
> Anyone who may have personal experience please let me know about 
> working with and using this strange little radio.
>
> A web page that has good pictures and a schematic of the set can be 
> seen at:
>
> https://www.pa3esy.nl/military/gb/army/ws38/html/ws38_set.html
>
> Ray F/KA3EKH
>
>
>
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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