Hello John and other VHF Contesters.....I may be completely lost here,
but I thought that the "ICOM spike" occurred when PTT was pushed just at
the first of a transmission......The overshoot was in the first few
milliseconds of TX, not at key-up. The causes are poor design and have
been around for years. There have been several different "work
arounds", but that is what they are. They are not fixes.
I use the transverter port on my Pro2s and Pro3s to run my
transverters. Those ports are supposed to be -20dbm.....1/100th of a
milliwatt. You cant hurt anything with that, so even if there is a
spike, it is so low that no harm is done.
I am also not an instrumentation guy, so it would be nice to see how
this spike is measured. You would have to have a very fast scope to see
the spike, but certainly there are such instruments running around.
If I am completely lost on this, here is the chance for the real experts
to beat me up......HI.
73 Marshall K5QE
On 10/4/2018 12:19 PM, John Ackermann N8UR wrote:
This may be old news, but I wanted to see if my IC-7300 had the key-up
power spike that's been reported on other Icom rigs when the power
output is turned down. The short answer is that I don't see any sign
of overshoot, so this rig should be safe to use with amplifiers or
transverters that want the wick turned down. (Of course, you can
still blow things up by forgetting to turn the power down...)
Details and pretty screenshots at https://blog.febo.com/?p=321
73,
John
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