It is unfortunately very difficult to make conclusions; Evan is doing his best to help.? ?I'm still thinking the actual measurements are needing careful repeat and clarification; for example the sources of the final MOSFETS are solidly SOLDERED TO THE GROUND PLANE, so yes, they should always show a zero ohms to ground.? ? The DRAINS go to capacitors and the power supply so will show a transient response.??
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If a power mosfet smoke during RECEIVE, something is still very badly wrong with (a) the power switching mosfet system or (b) the receiver TX/RX switch or both.? ? My money is on the power switching system being bad in some way allowing the amplifiers to oscillate.? ? But very careful measurements that are utterly unassailable will help you out the most in logically figuring this out.
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It may be simpler to buy a new board or a completed unit.? ? I know I have smoked some things while poking around in these radios and I did a LOT LESS poking around than you are having to do.? ?The chances of causing problems while trying to fix problems are very high with such a densely packaged radio and such elegant circuitry.? ??
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Good luck!
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Gordon KX4Z
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