From: DL4YHF@aol.com
Message-ID: <1e0.2fe88d57.2ed8ca8a@aol.com>
Date: Fri, 26 Nov 2004 13:06:02 EST
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Sunday activity report (PSK)
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<HTML><FONT FACE=arial,helvetica><HTML><FONT  SIZE=2 PTSIZE=10 FAMILY="SANSSERIF" FACE="Arial" LANG="2">Hello Brian and group,<BR>
<BR>
I will try PSK31 , PSK08 and PSK02 on Sunday morning (1000-1200 UT, maybe earlier), frequency 137500 Hz.<BR>
For comparisons, I will transmit "normal" PSK31 with the usual amplitude shaping, but also for a few minutes using slow phase transitions and constant amplitude (resulting in a somehow broader spectrum). <BR>
<BR>
To transmit, I use SpecLab's digimode terminal, and varying "pulse shaping" percentage from 10 to 30 percent. The PSK-de(!)modulator in SL is not optimized for the phase transitions yet, so the pulse shaping time must be less than 30 percent of the symbol time. The PSK31 transmissions can be decoded with any of the widespread PSK31 programs, to receive PSK08 and PSK02 you can use Spectrum Lab which has some "presets" in the digimode terminal's menu for PSK31, PSK08, 02, and 01 now. It can be downloaded from <A HREF="http://www.qsl.net/dl4yhf/spectra1.html">http://www.qsl.net/dl4yhf/spectra1.html</A>.<BR>
<BR>
Besides this, try some more CW activity during the weekend, though WX conditions don't look promising here.<BR>
<BR>
Best regards,<BR>
Wolf DL4YHF.<BR>
<BR>
<BR>
<BR>
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