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Date: Sun, 24 Jun 2001 22:54:25 -0600
From: Larry East <w1hue at ida.net>
Subject: Re: [Elecraft] K2 and CMOS Super III Keyer Question?

At 06:04 PM 6/24/01 -0700, Glenn Maclean wrote:
>Is anyone using a CMOS Super Keyer III with their K2? I received a kit as a
>Father's Day gift. I was able to get it put together in time for field day.
>I like the silky smooth operation it has. I do notice interference from the
>keyer when the memories are queued up. I have a loop back message with a
>five second pause stored in the #1 memory. When the memory is active I can
>hear a interfering tone on 20 meters. Has anyone else had this symptom with
>the CMOS Super III keyer?

I have a CMOS Super III keyer and use it with every rig that I have -- 
including the K2. I have never experienced any interference problems.


>I am using shielded cables. It makes no difference if I use a 9 volt battery
>or external power supply. I did use a plastic project enclosure from Radio
>Shack. Would this cause the problem?

Could well be -- I built mine in a metal box. I also put 0.01uF bypass caps 
directly at the external power, paddle and output connectors. I have made 
no before/after comparisons so I don't know if they have any effect -- it 
just seemed like a good idea.

72,
Larry W1HUE/7
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Date: Mon, 25 Jun 2001 19:01:31 -0700
From: "Glenn Maclean" <wa7spy at home.com>
Subject: [Elecraft] CMOS Super Keyer RFI problem resolved

Thanks to all for the suggestions. I ended up installing .01uf bypass caps
to the power receptacle, dot and dash lines, key out line, and voltage
regulator in and out lines to ground. I also wound the power cord 4 turns
around a T50-2 toroid at the plug end. No more RFI.

I also kept the Radio Shack plastic enclosure and all is well with it.

Interestingly enough the RFI was right at 14.060 Mhz

Thanks again,
Glenn WA7SPY
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