[TenTec] Omni-V sick from pc

[John - G3JAG]

OK Scott. Yes the three wire cable has to be wired the way T*T
recommend, but there is no other connection at all - there is no
provision for any of the normal handshaking lines to be connected
between the Omni-V interface and the PC. So the most the null modem
connection needs to do is swap TXD and RXD; anything else is
superfluous. I use just the three wire connection; nothing more.

Thats what makes me think you may have another problem. In particular, I
still wonder about RF feedback into the Omni-V RS232 port and/or into
the PC. Something is causing the problems you describe and stray RF has
to be a possibility. I have clip-on ferrite gizmos on many of my PC
leads here - just in case. I still get some RFI symptoms on the
monitor, usually only on 10 mHz. Not sure why, but other bands are
clear even at 500w output. Note that I can also hear the PC on 10 mHz,
unless I minimise the software that is running. If I put everything
into the background, most of the noises disappear. Sometimes thats the
only way to copy a weak signal underneath a birdy from the PC.

Turning the (full metal jacket) monitor off also works, but is a
nuisance.

Computers are a mixed blessing in a ham shack.

73 John


On 05-Nov-99 Scott Howell wrote:
> 
> well John that's exactly what the logging software does. Only polls
> the rig
> when info is needed. otherwise sits back and leaves things alone. I
> have
> wondered though that the three wire cable didn't work well by itself
> and now
> I can't recall exactly what the reason was, but in any event a null
> modem
> adapter on there fixed that, but perhaps it introduced a new problem.
> I have an UPS so no worries on the system going down when pwr goes
> out.
> I've got a few other tests I want to try and its also possible the
> reset
> switch for the processor is faulty thus taking a number of times to
> reset
> the rig. I will be testing that soon as well.
> tnx for the thoughts and its an intresting problem<G>.
> 
> 
> 
> 73 de Scott/n3byy
> Laurel MD
> Fists #5030 . Qrp- #1689 . Zombie #333
> for immediate response, send mail to n3byy@amsat.org
> home page http://www.qsl.net/n3byy
> 
> 
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E-Mail: John - G3JAG <patents@dx0man.prestel.co.uk>
Date: 05-Nov-99
Time: 23:34:48

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