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| To: | <[email protected]> |
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| Subject: | Re: LF: Fldig Flarq mfsk16 |
| From: | "James Moritz" <[email protected]> |
| Date: | Thu, 5 Feb 2009 22:57:49 -0000 |
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| Sender: | [email protected] |
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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