Arv Evans

There seem to be multiple causes of an initial RF pulse on PTT activation.
1) AF caused by PTT switch operation
2) Voltage changes as circuits are powered up...or down
3) momentary reflections toward balanced modulator, caused by
bi-directional IF amplifiers changing direction.

In past messages several persons have indicated they have partial fixes
for some of these problems. Those individuals may point you toward
their posts, or you could search the older messages for this subject.


Earl wrote:

Anyone in the group notice a quick BUMP of RF when the PTT is pushed,
then the power meter quickly returns to zero before modulation takes
Wondering if perhaps I have bad switch ?? Why the delay ??

Regards.....Earl (VA6RF)


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