Return-Path: Received: (qmail 9958 invoked from network); 18 Feb 2002 17:36:15 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 18 Feb 2002 17:36:15 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 23547 invoked from network); 18 Feb 2002 17:36:15 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 18 Feb 2002 17:36:15 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16ct9k-0005jU-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 18 Feb 2002 19:08:56 +0000 Received: from imo-d08.mx.aol.com ([205.188.157.40]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16ct9g-0005jP-00 for rsgb_lf_group@blacksheep.org; Mon, 18 Feb 2002 19:08:53 +0000 Received: from DL4YHF@aol.com by imo-d08.mx.aol.com (mail_out_v32.5.) id l.112.cc2a2d6 (3703) for ; Mon, 18 Feb 2002 12:30:15 -0500 (EST) From: DL4YHF@aol.com Message-ID: <112.cc2a2d6.29a29426@aol.com> Date: Mon, 18 Feb 2002 12:30:14 EST Subject: Re: LF: M0BMU test transmission on sunday evening. To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="------------060309060008040307010405" X-Mailer: AOL 6.0 for Windows XP DE sub 50 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: This is a multi-part message in MIME format. --------------060309060008040307010405 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Hello Jim, Markus and group.

> didn't know there was such a thing as a "squelch killing postamble tone",
> so my hardware may be ignoring it - what form does it take?


Your TX hardware does not ignore it, Jim...
my receiver ignored it in the QRM, and it was not visible on the spectrum here. But it can be seen in a screenshot of your transmission which Markus sent me (see attached image).

It is just an unmodulated carrier at the center frequency, visible on the right side.
If the PSK31/PSK08 decoder detects it, the accumulated 'squelch' value is cleared.
In PSK08 mode, the postamble tone is transmitted for about 4 seconds. The "LED" is yellow during this time (steady, flashing yellow/red indicates "TX buffer empty").

>
> So congratulations are due to DL4YHF...

Thanks for the flowers, I'll have to pass them on G3PLX who had the idea for PSK31 and did the hard work to implement it for the first time.


As I see it, PSK08 is a 'quite weak signal mode' useful for communications with a fair amount of information exchange but cannot be compared to 'real weak signal modes' like WOLF, JASON and Bill's very slow BPSK modes.

If there is a significant performance gain for PSK08 compared to PSK31 on a noise LF band, remains to be tested. For static crashes which block the RX for a few hundred milliseconds, PSK31 may be just as good as PSK08...



Regards,
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