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Message-ID: <001001c6a8c7$53154920$56217ad5@w4o8m9>
From: "James Moritz" <james.moritz@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
References: <006c01c6a89d$40ec7d10$6501a8c0@eagles>
Date: Sun, 16 Jul 2006 12:02:27 +0100
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Subject: LF: Re: DFCW on TS450
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Dear J, LF Group,

It occurs to me you need to be a little careful generating DFCW in this
way - if , during a transmitting session, the number of up and down shifts
are not the same, you will end up on a different frequency than when you
started. So it would be as well to check the frequency at the start of each
over.

Cheers, Jim Moritz
73 de M0BMU

----- Original Message -----
From: J. Allen <vy1ja@northwestel.net>
To: LF (RSGB) <rsgb_lf_group@blacksheep.org>; <lowfer@lwca.org>
Sent: Sunday, July 16, 2006 7:01 AM
Subject: LF: DFCW on TS450


> All,
>
> Tests here show the UP an DN pins on the TS450 front Microphone connector
do
> move the frequency up and down when in transmit on CW.
>
> The QRS software shift signal from the computer is intended to key a
single
> line to ground to switch mark frequency from shift.
>
> Does anyone have a circuit for 74XX series ICs to switch the signals from
> that line to close the circuit momentarily on either the UP or DN pins?
>
> I am working on it with a breadboard and am tired right now and it is not
> happening for me.
>
> J
> VY1JA
>
>
>
>