I didn't suggest anti-Pactor missiles, Demetre, I humorously suggested that
anti-PMBO missiles were on the Christmas lists of many hams this season. You
claimed that this constituted an admission on my part that I have QRM'd
PMBOs -- which is complete nonsense, but unfortunately typical of your role
in this thread.
The fact that you must resort to this chicanery makes clear the weakness in
your position.
The bottom line is that Winlink could easily incorporate a modern,
effective, inexpensive busy frequency detector in its PMBOs. It has chosen
to not do so and instead to continue to QRM others.
73,
Dave, AA6YQ
-----Original Message-----
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Behalf Of Demetre SV1UY
Sent: Saturday, December 29, 2007 4:27 AM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: QRM on PACTOR PMBOS now from DAVE, Congrats!!!
--- In digitalradio@yahoogroups.com, "jgorman01" <[EMAIL PROTECTED]> wrote:
>
> I'm not sure what HF Packet BBS's you're talking about but all my
> packet tnc's had a carrier detect feature and would not transmit if
> one was detected. Was it perfect, heck no! But it was available AND
> it was turned on.
>
> Jim
> WA0LYK
Well Jim,
The DCD mechanism of an HF TNC does not transmit when there is another
PACKET signal on the frequency. When there is a voice or other signal
it does not understand it and continues transmitting on top of them.
Some times it might stop because it confuses the voice or other noise
with DATA, but this is not how it was designed to work.
Really the DCD only works with the same waveform as the TNC transmits.
So in the PACKET RADIO case it should only stop at the presence of
another PACKET RADIO signal, but not at the presence of a voice or CW
signal.
What you are referring to can only work either with the squelch turned
on if your HF Radio supports it, and if anyone does it on HF they will
get no chance of transmitting at all due to the constant noise. That
was common on VHF before the DCD software state machine of the TNCs
became more sophisticated, so people had to rely on the squelch and
many LIDS started whistling on the frequency, so the PACKET station
never got a chance to transmit.
Now the carrier detect that you are referring to is an option in the
old TNCs and nobody ever user since all the LIDS could stop their DATA
transmissionwhenevr they pleased, just like some people proposed in
this list using Anti-PACTOR missiles. Hi Hi Hi!!!
73 de Demetre SV1UY
