----- Original Message -----
From: "Tommy" <aldermant@alltel.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, August 12, 2005 8:17 PM
Subject: Re: [TenTec] Omni VI+ Keying
I don't have experience with a 'pulser' as I've always found it much
easier to tune by holding the key down or using the TUNE button.
The TUNE button is easier on the operator, but can be harder on the
PA if it isn't designed for RTTY service. It also keeps my cantenna
dummy load from overheating when testing amplifiers as was the
case this evening when I was trying to check out a Centurion 422 for
a friend of mine :))
But
yes, when Ten Tec changed to Logic chip v1.03, supposedly to get rid
of the mysterious 'micro-chirp', they forgot to inform CW operators
that with v1.03, the Omni 6 Plus would no longer key much over about
40 wpm. So if you bring your 'pulser' down below about 40 wpm, it
should work. If you want to see your 'pulser' work at 48 wpm, you
have to change the Logic chip back to v1.02.
Yeah, that would make sense. It's clearly not following the pulses
at 48 WPM.
Thanks, Tommy!
73 de Mike, W4EF....................................
Tommy - W4BQF
At Friday 10:52 PM 8/12/2005, you wrote:
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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