I think he had the interface ground hooked to the "hot" (tip) of the
key jack and the output "hot" hooked to ground(shield).
Am I correct Frank ?
Robert E. Naumann
N5NJ / V26O
N5NJ@arrl.net
www.qsl.net/n5nj
Plano, TX USA
ex KR2J, V26RN, W6V, WA2OVE
----- Original Message -----
From: "PETER BARRON" <ve3pn@igs.net>
To: "'Frank Grossman'" <71042.1303@compuserve.com>;
<CT-USER@contesting.com>
Sent: Wednesday, August 02, 2000 07:04
Subject: RE: [ct-user] LPT Keying Cable? Problem
>
> By positive do you mean it need a HIGHER voltage is key down?
>
> If so it sounds like the keying circuit transistor has a wide range
of gain under the wrong "wrong" biasing conditions.
>
> Peter
>
> -----Original Message-----
> From: Frank Grossman [SMTP:71042.1303@compuserve.com]
> Sent: Wednesday, August 02, 2000 12:20 AM
> To: Bob Naumann - N5NJ; CT-USER@contesting.com; Grossmanzz@aol.com
> Subject: [ct-user] LPT Keying Cable? Problem
>
>
> Hi Bob...
>
> >>What is the solution ?
> What was positive - what was negative ??<<
>
> My Dad, Harry, W2LOZ <grossmanzz@aol.com>, actually gets the credit
for the
> heavy lifting in terms doing the wiring and measurements following
the
> suggestions I got from the list. The shack is in his apartment, and
I'm not
> there much of the time.
>
> Anyway, here's how he explained it to me when he finally got the
W1WEF keyer
> to work: The IC-765, and probably many other radios, are wired for
positive
> keying. All the keyers and interfaces in the shack work fine this
way, even
> though some are actually hooked up to key negative, and
theoretically
> shouldn't work. Only W1WEF's transistor is fussy and must have the
correct
> polarity to work properly. A jury rigged cord worked, so, my Dad is
wiring up
> a reversing cord so for a permanent fix.
>
> Hopefully, I've explained it better now...
>
> 73,
> Frank
>
> --
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>
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