[AMPS] Output Pulse from ICOM 706

[Doug Hall]

All this talk prompted me to take my storage scope home tonight and
have a look at the rigs I use. Here's what I saw at 3.5 MHz as
measured with a 2Gs/sec digital scope:

On my Icom IC-706Mk2G, approx 1 year old:

pwr	spike	overshoot
===	=====	=========
100w	100w	    0%
 75w	 91w	   21%
 50w	 73w	   46%
 25w	 52w	  108%
 10w	 26w	  160%

On my 9 year old Kenwood TS-850SAT:

pwr	spike	overshoot
===	=====	=========
100w	109w	    9%
 50w	 58w	   16%
 25w	 30w	   20%

I didn't check my Johnson Ranger :-) Anyway, the 850 looks pretty
good, about 20% is the worst case. The output power on the 706 returns
to nominal after about 2.5 mS. I took some pictures, and if there's
any interest I can put them on a web page for others to see.

It would seem to me that the IC-706 (and rigs like it) would mainly be
problematic with amps that require substantially less than 100w to
drive and that switch quickly. Is this correct?
73,
Doug, K4DSP


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