Message-ID: <424A6F06.4090002@freenet.de>
Date: Wed, 30 Mar 2005 11:19:02 +0200
From: Wolf DL4YHF <dl4yhf@freenet.de>
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To: rsgb_lf_group@blacksheep.org
References: <004601c534a1$c6a83aa0$3c01a8c0@JKA> <1625530840.20050330103630@t-online.de>
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Subject: Re: LF: XES PSK01
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Greetings everyone,
Despite the poor copy in PSK01, it shows what "would have been possible" 
with a transmission using heavy FEC (forward error correction) and block 
codes - sort of what moonbouncers use on 144 MHz, though JT65 is 
definitely not a good choice for LF since we don't suffer from doppler 
effect, faraday fading etc here.

Keep in mind that PSK31 (from which PSK01 is just a slower variant) was 
intended as a keyboard-to-keyboard mode. There is are decent FEC 
capabilities in G3PLX's PSK implementation, but it uses QPSK in that 
mode to maintain the same throughput, and IMO QPSK in very slow modes 
demands too much frequency stability (for RX, TX, and analog/digital 
converter clock).

Well. just a few thoughs .. I may add FEC coding to (B)PSK01 but I think 
WOLF- or JT65- like block codes are way more efficient, so it may be 
more rewarding to add a simple ("Jason-like") user interface to 
Stewart's programs. Any volunteers ? ;-)

73, Wolf DL4YHF .


Hartmut Wolff schrieb:

>John,
>
>  
>
>>WD2XES will be running in Spectrum Laboratory's PSK01 mode tonight on
>>137.442 kHz, starting by 2300 UTC. If conditions are really good, there is
>>some chance that Hartmut may have a little copy overnight.
>>    
>>
>
>Only very little copy. 2 full "WD2XES". Warren, WD2XGJ was very strong
>the whole night Captures are on my website.
>This is what I captured from the PSK 01 transmission during the night:
>
>---
>u e bf1€Ç yti t o{18}f %el rv {10} e yelnen MA.. W?XEb eo52y4S tonl`n
>e Žo X WDo se o{24}HoldeIMn {27}Ø{10}toI t yPo Xoeewae ten,eg MA.g
>  
>