[CQ-Contest] Contest Keyers

[k7qq at juno.com]

Just try using the keyer that is included with all the contest logging
programs. It sends at the speed that you have the   software set for and
is adjustable for weight etc in NA  and I assume the others.  Also allows
for type of keyer,  The only thing required is a female stero jack and 3
short pieces of wire to the db9/db25 connector.  
With most newer radios the keyer is built in the rig,  I have used that
keyer also with no problem.

Quack       aka.  Rex


On Fri, 28 Sep 2001 11:08:18 EDT TOMK5RC at aol.com writes:
> 
> 
> Alas, I fear it is time to retire my Curtis CK1 and CK2 keyers.
> Any consensus on what bulletproof keyer to use for contests?
> Logikey? W9XT? Others?
> With most functions coming from the computer, the demands
> on the keyer are far less than in the past, but I don't need 
> anything
> that is unreliable.
> Any collectors interested in CK1 and CK2 keyers? I have
> two of each.
> 
> Tom, K5RC
> aka NV7A
> 
> 
> --
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> Administrative requests: cq-contest-REQUEST at contesting.com
> 
> 
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>From Mike" <W4EF at dellroy.com  Sat Sep 29 04:18:29 2001
From: Mike" <W4EF at dellroy.com (Mike)
Date: Fri, 28 Sep 2001 20:18:29 -0700
Subject: [CQ-Contest] Output pad for running QRP?
References: <3BB48A22.25198.730EFC7 at localhost>
Message-ID: <02b501c14895$69b54960$6401a8c0 at neptune>


Hey Tom, 

What about adding a loop thru at the output of a low-level stage and adding a pad at that point? 
This would limit power without introducing bias changes and while avoiding the need for 50 to 100 
watt rated pads.

Mike, W4EF..........
  
----- Original Message ----- 
From: "Tom Rauch" <w8ji at akorn.net>
To: "[Contest Reflector]" <cq-contest at contesting.com>; "KEN SILVERMAN" <k2kw at prodigy.net>
Sent: Friday, September 28, 2001 11:33 AM
Subject: Re: [CQ-Contest] Output pad for running QRP?


> 
> > What is the best way to attenuate the output of a 100w transceiver to
> > achieve 5w output?  My current radio puts out around 10 watts when the
> > level is at the minimum.
> 
> Since I use radios to measure IMD of amplifiers on a regular basis, 
> I can offer an opinion based on measured data.
> 
> I'd ALWAYS use an attenuator pad, and never rely on anything 
> else, unless I cared less about IMD performance. The only 
> exception would be if I checked the system and knew it was OK.
> 
> Many radios have notoriously slow ALC systems, and virtually all 
> solid state radios go through a minimum in net transmitter IMD 
> when operated at the rated power. Even if that isn't a factor, every 
> radio I know of biases a stage closer towards cutoff to reduce drive. 
> That works OK if the gain reduction is slight, but it is a big time 
> problem if you are reducing gain more than the factory planned on 
> for normal operation. What you are doing is moving a very early 
> class A amplifier towards class C (cut-off) to reduce gain! 
> 
> For example, my stock IC751A's have the best IMD performance at 
> about 50 watts PEP output with two steady equal tones. I want to 
> keep the peak power mostly around that point, which means when 
> I get frequent peaks at 100 watts a lot of the TIME of the envelope 
> is spent around the optimum power value. If I run less power, down 
> around 5 watts, IMD is actually about 5 dB worse. At about 2 
> watts,obtained through ALC reduction, IMD skyrockets.
> 
> I've seen some systems change even more than that, when stages 
> are not biased properly. If standing current is too low, IMD 
> performance improves with more drive! So it is more than an ALC 
> problem.  
> 
> IMD power almost always gets worse at low power levels in solid 
> state radios, and virtually always much worse at higher than rated 
> power levels, when compared to the main signal power at that level. 
> 
> I've noticed some radios even have internal adjustments moved to 
> allow more power than the factory uses. That's bad news just like 
> excessive power reduction is (or worse).
> 
> 
> 73, Tom W8JI
> W8JI at contesting.com 
> 
> 
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> Administrative requests: cq-contest-REQUEST at contesting.com
> 


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