[VHFcontesting] Testing IC-7300 for TX power overshoot

[Marshall-K5QE]

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