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Author Topic: Who Works MFSK?  (Read 904 times)
W2JLB
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Posts: 27




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« on: July 28, 2008, 08:48:11 AM »

Over the weekend I saw someone calling CQ on 20 meters (around 14.075) using MFSK. It was a targeted CQ for some states needed for WAS. So, I didn't call him or connect to him. Of course it takes a little bit more bandwidth than PSK31 but he was solid the entire time I monitored him.

Are there many folks using MFSK? Where do they work on the various bands?

I'd like to give it a try.

Joe - W2JLB
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G4AON
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Posts: 543




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« Reply #1 on: July 28, 2008, 09:25:27 AM »

Joe I often find/work stations on MFSK-16 as it is one of the modes included in several of the soundcard data programs. I use Ham Radio Deluxe and DM780 which includes MFSK and Olivia too. These are similar modes with Olivia being a bit slower and perhaps slightly more robust. You will find a list of Olivia frequencies at: http://hflink.com/olivia/

73 Dave
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W2JLB
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« Reply #2 on: July 29, 2008, 10:18:35 AM »

Dave, thanks for the reply and the link. It is very helpful.

73 - Joe W2JLB
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N4UM
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Posts: 480




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« Reply #3 on: July 29, 2008, 04:23:09 PM »

Most MFSK-16 operation is a few khz above the psk31 areas on the different bands.  It is far more robust than psk31 although a bit harder to tune.  

Mfsk-16 and Olivia 16/500 (another robust mode) are about the only digital modes you'll find on 80 meters in the summer months when qrn is high.  Most of the mfsk-16 and Olivia 16/500 operation on 80 is between 3580 and 3585.
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N5YPJ
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Posts: 642




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« Reply #4 on: August 02, 2008, 04:26:38 PM »

I do every chance I get!
MFSK is a very nice mode, yes it does take up some more BW than PSK31 but it is robust. Olivia is even more robust, there have been times no matter what I do I can't hear the signal but get perfect print!

As for BW, I hear some guys have some concerns about the extra BW used by these modes but I hear so much BW being unused on 40 and 80 that at least at the present I don't know why there is this concern. Maybe my RX is bad, but in SW Texas I don't hear a lot of digital sigs on 80 & 40 EXCEPT for contests. These modes are great for the point we are at in this solar cycle where the lower bands are the most reliable, if everybody just takes a little care to not invade a freq that is established for another mode IE 7.070 & 7.035 MHZ are used for PSK-31 on 40 mtrs.
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W2JLB
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Posts: 27




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« Reply #5 on: August 03, 2008, 10:48:52 AM »

Rich N5YPJ, thanks for your response. Since I left this message last week I've had QSOs on 20 and 30 meters using MFSK. I like the mode a lot. I've worked N4UM, who posted a reply above, a couple of times and experimented with Olivia with him.

I don't think the additional bandwidth is a problem. Certainly not with MFSK. I hear quite a bit of digital on 40 and 20 meters and some on 30 meters hardly any on 17 or 80 meters. The other bands have limited propagation at this time. The combined bandwidth being used is very small compared to what is available. Maybe if we got an additional 100,000 or so new hams (wink) then we could make adjustments.

73 - Joe W2JLB

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KB2HSH
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« Reply #6 on: August 21, 2008, 07:05:50 AM »

MFSK-16 and Olivia 500/16 are superior during lousy band conditions.  This summer, I have worked TONS of great DX with a low Zepp and 3 watts with both modes.  

Don't rule out 30 meters, either!

John KB2HSH
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W2JLB
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Posts: 27




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« Reply #7 on: August 21, 2008, 07:20:26 AM »

John, KB2HSH, thanks for your response. Since posting this question I have worked a lot of MFSK16 and Olivia. You're right Olivia gets through no matter what. It is pretty slow especially for a fast typist like me, but it gets through when nothing else will. I've kind of adopted MFSK16 as my "default" mode of operation. With the current band conditions especially the QSB I find MFSK16 much more dependable than PSK31.

My preferred band for digital is 30 meters. I've joined the 30 Meter Digital Group I'm # 1057.

73 - Joe W2JLB
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KB9UMT
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« Reply #8 on: August 22, 2008, 06:25:39 PM »

Joe,
For sure don't rule out 30 Meters as 20 Meters is usually very crowded.  You will come across a number of digital ops on 30 Meter that use MFSK and also will reply back to your MFSK CQ's ...a number of them both here in NA and in EU (EU has been stronger on 30m around 1900z to 2300z). Give 30 Meter Digital a try sometime.  Most the MFSK signals on 30 Meters is around 10.140 to 10.143 (BPSK31 most used on 30m at this time around 10.140 USB +/-1000 to +2000 with MFSK usually toward the higher end).

http://www.projectsandparts.com/30m/

Don kb9umt
http://www.30meterdigital.org
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