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LF: Re: 3 Mode Beacon

To: <[email protected]>
Subject: LF: Re: 3 Mode Beacon
From: "James Moritz" <[email protected]>
Date: Sun, 10 May 2009 23:27:27 +0100
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Dear Graham, LF Group,

Have been watching your test for an hour or so. At the peaks of the fades, all 3 modes decode quite well:-

MSK4:
CQ CQ CQ de g0nbd g0nbd g0nbd
CQ CQ CQ de g0nbd g0nbd g0nbd
qsl [email protected]  [email protected]

ThrobX 2:
CQ CQ CQ DE G0NBD G0NBD G0NBD
CQ CQ CQ DE G0NBD G0NBD G0NBD
QSL [email protected] [email protected]

PSK31:
e C
 CQ 1Q d0nbd g0nbd g0nbd
CQ CQ CQ de g0nbd g0nbd g0nbd
qsl [email protected]  [email protected]


When the signal levels are down, MSK4 seems most robust, with Throb somewhere in the middle:-

t¹8n° ND
CQ CQ CQ de g0nbd g0nbd g0nbd
CQ CQ CQ de g0nbd g0nbd g0nbd
qsl [email protected]  [email protected]

3-LNBD G0NBD G0NBD
CQ CQ CQ DE G0NBD G0NBD G0NBD
QSL [email protected] [email protected]

CQ CQ d
g0nId g0e
d g0nbd
iQ CQ CQ de g0p
p .0Êwg
eet
g  tloTail.°

Watching the decodes, I am seeing that PSK31 is vulnerable to static crashes - each loud burst of QRN corrupts a few characters, while the other modes seem to tolerate this better. This is similar to previous experience. When the QRN is not present, the PSK31 is nearly as good as the other modes.

Cheers, Jim Moritz
73 de M0BMU


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