[ct-user] Serial interface & keying

[Steve Dove]

Greetings,

Some interfaces derive their supply from pins 4 and 7, precluding their use for
keying.

73,        Steve        W3EEE  /  G3YDV


Ron Stordahl wrote:

> Waldek et al
>
> Yes you can use a single serial port simultaneously for rig control and for
> CW keying, I have done so.  I use an ICOM781 and its interface only uses 3
> wires (RX, TX and Ground).  The DTR line is free and you can use it for CW
> keying using the appropriate transistor circuit shown in the CT manual.  I
> have done this only with CT using DOS, I have not tried this with WinCT.
>
> It works, but there is a serious drawback, which could easily be fixed by
> Ken (if  could get his attention):
>
> I start CT using a batch file, which first loads and starts the COMTRS's,
> COM1 for rig control & CW keying, COM2 for PacketCluster TNC.  Immediately
> after COMTSR for COM1 starts the radio goes into key down mode.  And it
> stays in key down mode until CT loads, starts, gets to the final
> screen--then you must hit one of the CW function keys to send something.
> Only then does the key down condition clear. COMTSR is asserting DTR true
> when it could be easily changed to do just the opposite at initialization.
>
> Of course you can switch your rig to SSB temporarily to get through this
> frustrating problem, or you can switch to LPT keying which completely avoids
> this problem.  I switched to LPT keying, purchasing a separate LPT card.
>
> COMTSR needs to be modified to correct this problem.
>
> 73 Ron N5IN
>
> From: "Waldemar Krzok" <Waldemar@zedat.fu-berlin.de>
> >
> > Hi Folks,
> >
> > a few months ago I read on this reflector that someone managed to
> > get rig control and keying on same (serial) port. Both handbook
> > and my experiense sez that this combination does not work.
> > I'm using Kenwood TS690 with ct 9.46.
> >
> > Waldek, DL7ANQ & SO6ANQ
> >
> >
>
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