Sounds like power spiking to me. This was a problem that ICOM had for some
time now. No matter where you have the RF drive level set to, there is an
instantaneous output of FULL POWER for a split second, then after that split
second the power drops to the "set" level. You have pretty much proved this
by
stating that when you use PTT and hesitate speaking for a second and using
PTT on CW instead of vox. When you use vox or QSK there is drive power present
as soon as the transmitter is energized and therefore you have full power
for a split second. You can only see this on an O scope since the time factor
is milliseconds. The trip circuit in the amp will pick this up. Just for
fun, try using a different radio like a Yeasu (borrow a friends) Set it up the
same way and see if you have the same problem. I was told by several
contesters that run ICOM products and ALPHA amps that they had exactly the
same
problem as you say. They spoke with ICOM and they generally deny that their
products have this problem. The best test is to try another brand of radio
and
see what happens. This is the only explanation I can think of. The test is
simple. Good Luck
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