Date: Mon, 11 May 2009 12:17:59 +0200
To: rsgb_lf_group@blacksheep.org
From: Rik Strobbe <rik.strobbe@fys.kuleuven.be>
In-Reply-To: <6CAB0066191C4E76B92C8821061A1CB9@AGB>
References: <1B3950C0CC6641F29CD92B0269A04581@JimPC>
 <6CAB0066191C4E76B92C8821061A1CB9@AGB>
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Message-Id: <20090511101759.CBFC3F3863@smtps02.kuleuven.be>
Subject: Re: LF: Re: 3 Mode Beacon
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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=20
the both Throbx2 and psk31 were printing well I=20
couldn't decode anything in MFSK4.
MFSK4 is probably a good mode to scope with=20
QSB/QRN for a signal the that peaks strong enough=20
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=20
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=20
>systems , I found the throb mode worked best last night
>may be its down to the noise format , but  psk31=20
>appears to of produced the highest error rates at
>all  locations , Rik reporting the throb system printing quite  well
>
>Tnx- Graham .
>
>
>
>
>--------------------------------------------------
>From: "James Moritz" <james.moritz@btopenworld.com>
>Sent: Sunday, May 10, 2009 11:27 PM
>To: <rsgb_lf_group@blacksheep.org>
>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 g0nbd@hotmail.com  g0nbd@hotmail.com
>>
>>ThrobX 2:
>>CQ CQ CQ DE G0NBD G0NBD G0NBD
>>CQ CQ CQ DE G0NBD G0NBD G0NBD
>>QSL G0NBD@HOTMAIL.COM G0NBD@HOTMAIL.CO
>>
>>PSK31:
>>e C
>>  CQ 1Q d0nbd g0nbd g0nbd
>>CQ CQ CQ de g0nbd g0nbd g0nbd
>>qsl nbd@hotmail.aom  g0nbd@hotmail.com
>>
>>
>>When the signal levels are down, MSK4 seems most robust, with Throb
>>somewhere in the middle:-
>>
>>t=B98n=B0 ND
>>CQ CQ CQ de g0nbd g0nbd g0nbd
>>CQ CQ CQ de g0nbd g0nbd g0nbd
>>qsl g0nbd@hotmail.com  g0nbd@hotmail.com
>>
>>3-LNBD G0NBD G0NBD
>>CQ CQ CQ DE G0NBD G0NBD G0NBD
>>QSL G0NBD@HOTMAIL.COM G0NBD@HOTMAIL.COM
>>
>>CQ CQ d
>>g0nId g0e
>>d g0nbd
>>iQ CQ CQ de g0p
>>p .0=CAwg
>>eet
>>g  tloTail.=B0
>>
>>Watching the decodes, I am seeing that PSK31 is vulnerable to static
>>crashes - each loud burst of QRN corrupts a few characters, while the othe=
r
>>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 mode=
s.
>>
>>Cheers, Jim Moritz
>>73 de M0BMU
>>
>>
>
>
>
>>
>>No virus found in this incoming message.
>>Checked by AVG - www.avg.com
>>Version: 8.5.287 / Virus Database:=20
>>270.12.24/2107 - Release Date: 05/10/09 07:02:00
>