GM,
Maybe it's not exact, but it achieves the same purpose: no external power
needed. It does borrow some power from the PC's parallel port.
It is easy to "steal" -V (from -5 to -12V typically, depending upon whether
you are running a desktop or laptop), but the +V supply is more tenuous. You
CAN do it, if the program supports the handshaking functions. Probably don't
want to, though, if you want to use the serial port as both freq. control
and keying. I tried to do this with TR, and it worked to a certain
extent--as long as a data path was established. This is a "chicken-and-egg"
situation, however, since you have to have a +V to initially establish
communications...
Since TR supports a paddle, I used the parallel port. However, when
grounding is a problem (such as a DXpedition), the serial port is MUCH less
RFI sensitive. Consider using the parallel port as a paddle input only, and
drive the keying transistor from the serial port.
Another idea for this situation is to grab +V from the IC706's 13-pin DIN
connector.
73 de Bob, K6XX
k6xx@arrl.net
www.k6xx.com
> -----Original Message-----
> From: trlog-bounces@contesting.com
> [mailto:trlog-bounces@contesting.com]On Behalf Of Kenneth E. Harker
> Sent: Monday, March 03, 2003 9:23 AM
> To: TR Log Reflector
> Subject: Re: [Trlog] Icom 706MKIIG interface for TR
>
>
> > ----- Original Message -----
> > From: John Unger <w4au@contesting.com>
> > To: <trlog@contesting.com>
> > Sent: Monday, March 03, 2003 5:28 PM
> > Subject: [Trlog] Icom 706MKIIG interface for TR
> >
> >
> > > I am trying to put together an interface for a IC706 to use with TR. I
> > > would like to be able to use one serial port for both the
> frequency read
> > > out and keying. I am trying to use the serial port voltages
> to power the
> > > transistors in the frequency read out part of the interface.
>
> It's not exactly the same thing you're trying to do, but K6XX has a neat
> interface description online:
> http://www.k6xx.com/radio/tr706cbl.html
>
> --
> ------------------------------------------------------------------
> ----------
> Kenneth E. Harker "Vox Clamantis in Deserto"
> kharker@cs.utexas.edu
> University of Texas at Austin Amateur Radio
> Callsign: WM5R
> Department of the Computer Sciences Central Texas DX &
> Contest Club
> Taylor Hall TAY 2.124 Maintainer of Linux
> on Laptops
> Austin, TX 78712-1188 USA
> http://www.cs.utexas.edu/users/kharker/
> ------------------------------------------------------------------
> ----------
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