Jim, Graham,
MFSK4 seems to be good once you have it synchronized, as John (W1TAG) states.
But the threshold to synchronize seems to be rather high.
Despite the fact that you signal was audible and
the both Throbx2 and psk31 were printing well I
couldn't decode anything in MFSK4.
MFSK4 is probably a good mode to scope with
QSB/QRN for a signal the that peaks strong enough
but when the signal is really weak Throbx2 seems the winner.
A pity that there is little info about Throb(x) on the web.
73, Rik ON7YD - OR7T
PS:
Jim, if you plan another WSPR session please let
me know. I will try to join (transmitting).
At 01:32 11/05/2009, you wrote:
Thanks for that Jim,
Seems its close between the mfsk and throb
systems , I found the throb mode worked best last night
may be its down to the noise format , but psk31
appears to of produced the highest error rates at
all locations , Rik reporting the throb system printing quite well
Tnx- Graham .
--------------------------------------------------
From: "James Moritz" <[email protected]>
Sent: Sunday, May 10, 2009 11:27 PM
To: <[email protected]>
Subject: LF: Re: 3 Mode Beacon
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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