I see in a UK electronic component catalogue that serial 9,15,25,37 way D
adaptors are available which have 1000pf ceramic bypass caps on each pin.
They must be available in the US? check out www.rapidelectronics.co.uk
73 Clive GM3POI
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: <cq-contest@contesting.com>
Sent: Tuesday, February 19, 2002 10:10 PM
Subject: RE: [CQ-Contest] Nagging problem
>
> At 03:50 PM 2/19/02 -0500, Mike Wetzel wrote:
> >
> >Scott,
> >
> >I recently experienced some very similar problems, rf wise. I've been
> >fighting my problems for the last 2 months and haven't exactly figured
out
> >what is wrong. What I did to fix the problem on CW was to install a
bypass
> >cap (.001) on the lead from the computer to the keying transistor in the
> >keying interface. Now last weekend in the contest that worked for the
first
> >24 hours then I had to install a second bypass cap from the base of the
> >keying transistor (in between the resistor and the transistor) that got
me
> >through to the end of the contest.
>
>
> At various times I've also found that grounding the computer case
carefully
> to the station bus solved the problem. It also seems to me that a few
> turns on a toroid, even with good shielded cable, will help to handle any
> common-mode currents that might be flowing between computer and radio.
>
> 73, Pete N4ZR
>
> Sometimes a tower is
> just a tower
>
>
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