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Considering a kenwood final on a washington, again.

brandon7861

Loose Wire
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Nov 28, 2018
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My daily driver is a uniden washington. I have an extra TS-130s final unit and I have been wanting to attach it to the washington for years now but abandoned it due to a lack of knowledge. I think I have the connections figured out now.
1787264607065.png

It would seem the first pair or wires on the bottom is for SWR foldback as it goes to a transistor very near to the directional coupler on the filter unit. I havent analyzed the circuit there, but I would assume bypassing the emitter would increase gain, so I am thinking swapping diodes D4 and D5 with caps and leave these two leads disconnected (or use it as a variable power mod). The thermal protection stuff that drives relays can go too because I don't normally sit on the mic very long. That should leave just the bias control thats TX only and the other three that I figure can connect right to 13v. Of course, the relays and a filter will have to be macgyvered onto a custom board and tucked inside the radio somehow (and shielded, maybe an external box, idk), a PS upgrade and maybe even some hot switching prevention.

I'm not an amp builder so I must ask if this would be ok to run on AM too or if I would need change bias for AM (the TS-130s had no AM). Anyone know if this will play nice with AM?
 

Hey Brandon,

I seen this interesting post repurposing a 757 GX Final (PA) unit to use with a QRP rig with 3-4watts that inputs into a 36db attenuator to reduce the drive to milli watts that the pa board needs.



In the photos he has more descriptions of how he achieved it. Thought you might like to read it for some ideas. Ironically when you posted I had been thinking of doing the same thing repurposing a spare ts430s PA stage I just got hold of.
 
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