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RCI 2950DX no tx AM

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griz
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RCI 2950DX no tx AM

Post by griz » Tuesday, 07 March 2017, 19:00 PM

Hello I have a 2950dx that has no audio on am it does key up with no out put and no audio on am, it does key up and modulate on ssb and it works on pa , I checked the voltage o q66 the center connection has 0 volts on am switched to ssb voltage good so i changed q66 and q51 still nothing , i am waiting on parts for q67,q65 i think that is the wright numbers , anybody have any other ideas thank you


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Re: RCI 2950DX no tx AM

Post by MDYoungblood » Wednesday, 08 March 2017, 12:05 PM

It has transmit but no modulation on AM, how is SSB or FM? Start looking for a cold solder joint.

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griz
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Re: RCI 2950DX no tx AM

Post by griz » Wednesday, 08 March 2017, 12:31 PM

on am you can tell it is keying up on a test radio but no modulation . on ssb it tx good with audio on fm works

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Re: RCI 2950DX no tx AM

Post by pabxone » Tuesday, 14 March 2017, 23:10 PM

It's most likely going to be a faulty transistor Q51 which should be a 2SA473 or a 2SB754.

It could also be Zener diode D68 or diode D66


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