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Author Topic: Does anyone have voltage levels for the Rockmite PSK-40 Transceiver?  (Read 812 times)
KE7FD
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« on: June 18, 2014, 04:31:40 PM »

It took me a few years to get this rig put together in between other demanding duties, but I finally put my PSK-40 Transceiver together. To be precise, it's the "November 2009-present" version.  I've triple checked the component placements, polarities, solder joints, you name it; been there done that. Still though, the receiver is deaf.  In fact, last night I found that when the software says to transmit it goes to receive and when told to receive, it transmits.  There's a TR voltage not working right.  I even noticed that Pin 8 on U1, was below the 7.5 volts it should be with the zener in place.  I isolated that joint, placed a new zener in its place with its own bias resistor and now it at least is above 7 volts (I lifted Pin 8 from the socket to do this).

The problem is that there was never a voltage level diagram published for this and Dave has since retired.  My bad for taking so long to get this built!  Anyway, if someone out there in QRP land has this radio and could take some Transmit/Receive voltage level measurements, I and possibly others would be very grateful.

Thanks,
Glen
KE7FD
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WB8YYY
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« Reply #1 on: June 24, 2014, 08:11:12 PM »

Try posting to qrp-l mailing list and someone familiar with this rig should answer, possibly even Dave himself.  Yes something is loading that zener.  Its even possible the TR circuit may not be at fault.  Analog transistors can be checked for 0.6 volt base emitter voltage, with collector to ground much higher.  Logic transistors have two states.  Try manual control in debugging to get pc and software out of the act.  If all else fails use google to locate another ham knowlegible on this rig.  I sense it is nearly working.   

Curt
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