Message-ID: <D4169831EAF34E0F94D012ED6FD97A3D@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <01eb01c9832c$74945e50$a402a8c0@Inspiron><20090131111012.i80joik1ztc0wggk@webmail4.kuleuven.be><AD8469FDDC2A4CE1A2AD0DA3753E415C@JimPC><000f01c983b5$cfe04330$8d01a8c0@JAYDELL><20090131200626.39efb3dc@lurcher><071798B2D2F8408E9570FC11F569524C@AGB><27CD4CCC51DF4FEBB3972EA48A91D068@AGB><20090204223221.yd4hyv5n06ko8c44@webmail4.kuleuven.be><CF8E217110774A38BA0E6B3C169CA6AD@AGB><20090204232519.zgxyis76wx0kk8ck@webmail4.kuleuven.be><8D12605601E74486B002F1EF1D6B263C@AGB><20090205212652.29796780@lurcher> <20090205213158.32fbd1da@lurcher> <6B3A5CCB0A524F06A0739EC58BDE29A0@AGB> <E2A6ECE9D59543C5A01A6DAB0AF18E0B@JimPC>
In-Reply-To: <E2A6ECE9D59543C5A01A6DAB0AF18E0B@JimPC>
Date: Thu, 5 Feb 2009 23:33:54 -0000
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Subject: Re: LF: Fldig Flarq  mfsk16  
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Jim,

Yes , copy was good even during deep fades, I did expect the olivia system 
to provide the better link, but as reported last night, the older mfsk 
system appeared to  give a quite reliable link, Gary and I did try out the 
250psk mode , which did  work but after loosing the connection, we found it 
was not possible to re link whilst using it ... however it appears you can 
change modes whilst linked ... I'm not sure the effect the pc speed has on 
the system, I was using a p3 1.1 ghz pc and the repeat response did seem to 
be a little slow from my station compared with your qso  with Gary .. that 
should be sorted soon ...

rgds

Graham ..

NB

This is a reply over the use of fldigi with the olivia mode, via the yahoo 
digital group  may be of interest ,

Olivia cannot be used as the transport mode for flarq unless the
timeout values in flarq are set to their maximums. Even then it is
highly likely that the digital effect of doubling will occur. Please
try to limit your use of flarq to those modes that appear on the
"Mode/NBEMS" menu item. These have been tested and are known to work
very well with the flarg implementation of ARQ.

73, Dave, W1HKJ






--------------------------------------------------
From: "James Moritz" <james.moritz@btopenworld.com>
Sent: Thursday, February 05, 2009 10:57 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Fldig Flarq  mfsk16

>
> Dear Graham, Gary, LF Group,
>
> Thanks for the QSOs this evening...
>
> It seems MFSK16 works quite well in the presence of QRN, which is quite
> strong here tonight. There is always MFSK8 and MFSK4 to try as well.
>
> The Flarq ARQ mode was quite interesting, although probably not what you
> want for a "traditional" QSO. I imagine it could work quite well when you
> actually want to transmit quite a large amount of text over a period of
> time, rather than "ur 599 wx not vy gud" etc. I set the packet length to 
> 16,
> the smallest possible, with the idea of maximising the chances of 
> receiving
> un-corrupted packets under weak signal conditions, at the expense of
> increased ARQ overheads. Timing out seems to be a problem; there are 
> options
> to configure number of retries and timeout period, which it would probably
> be sensible to set to more than the default 5 retries / 60s timeout due to
> the nature of the QSB on 500kHz. Also, there does not seem to be a way of
> forcing a disconnection if you lose contact with the other station - I 
> think
> this was causing trouble when I  was trying to "connect" G4WGT after G0NBD
> had timed out.
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
>
>



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