Nice one Jim and simple too. I think any technique using the up down buttons
could be prone to frequency shift due to spurious pulses
appearing....crosstalk from the PTT or even during the receive
period.....because there is no fixed carrier position. But it should be
possible to have time to check it out at Dot 60 !! Maybe a couple of
de-bounced buttons in parallel to correct any problems ??
Cheers de Alan G3NYK
----- Original Message -----
From: James Moritz <[email protected]>
To: <[email protected]>
Sent: 16 July 2006 11:53
Subject: LF: Re: DFCW on TS450
> Dear J, LF Group,
>
> See the attached circuit. The up/down output pulse widths are roughly
100ms,
> which I guess should be OK - if you want to change that, scale the values
of
> the two 10uF time constant capacitors. The supply voltage isn't critical;
> 5 - 15V certainly is OK. The RS232 voltage levels can vary over a similar
> range.
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
> ----- Original Message -----
> From: J. Allen <[email protected]>
> To: LF (RSGB) <[email protected]>; <[email protected]>
> 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
> >
> >
> >
> >
>
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