I just did an interesting experiment comparing my Paragon
585 (aka "Paragon 1") to an Omni 6+ that I just picked up
on Ebay. When I connect my Inrad Key Pulser
( http://www.qth.com/inrad/) to the Paragon, the forward power
reading on my Diawa CN-620B wattmeter reads in rough
proportion to the duty cycle setting of the Key Pulser (e.g.
if the wattmeter reads 100 watts at a Key Pulser duty cycle
setting of 100%, it read ~50 watts when the key pulser duty
cycle is set to 50%). Thus, using the Key Pulser with the
Diawa wattmeter, I can tune my amplifier at a 50% duty
cycle and just double the wattmeter reading to get the PEP
output level, thus minimizing the wear and tear on the amplifier.
When I try doing the proceeding with the Omni 6+, the
meter reading at anything less than 100% duty cycle
on the Key Pulser is about 10% of the full-scale (e.g.
key-down) wattmeter reading. I haven't put the Omni 6+
on my O'scope yet, but it sure seems like it is truncating
the pulses from the Key Pulser significantly compared to
the Paragon. The keying speed of the pulser is 48 WPM
with a variably duty cycle (50 msec pulse repetition rate,
0 to 100% duty cycle).
Anybody have any experience with this?
Thanks,
Mike, W4EF..........................................
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