[600MRG] MFSK

[John Langridge]

I'm guessing sync was the issue given the static crashes. Eric's signal was quite prominent in the waterfall and seemed unimpeded here.  One thing I found interesting was that part of the signal seemed to reside very near or almost outside the bandpass specified in the waterfall.  At one point during Eric's transmission I switched to MFSK8 because I was questioning whether I made an error reading his email...MFSK8 was too wide... so we will try again sometime.

I plan on playing with GMSK again soon.  I had pretty good results last time I ran beacon text with that mode.

thanks for the input and experience!

73,

John XIQ




________________________________
 From: John Andrews <w1tag at charter.net>
To: 600mrg at w7ekb.com 
Sent: Wednesday, October 30, 2013 6:24 AM
Subject: Re: [600MRG] MFSK
 

Eric,

Jay and I have used it many times. It works pretty well, either in fldigi or MultiPSK. There's enough error correction to make it fairly useful at LF/MF.

It does have a sort of "hysteresis" effect, where it will follow copy down into a fade, but takes a stronger signal to re-sync after a loss. I don't remember it as being fussy about tuning. It is a bit wide in BW, at least as compared to some of the PSK modes.

Jay and I both used SSB exciters that are USB only, and I believe our receivers were simply in CW mode tuned to the anticipated frequency, with the program just looking for the usual BFO pitch.

These are useful modes...I'd give 8 the edge over 4, due to the slowness of resync in 4 after a fade.

John, W1TAG

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