[WIARC] ARRL FMT

[Black Michael]

For those who may be interested in the ARRL FMT contest coming up Nov 13th....I've been running a Tue/Thu FMT (what we affectionately call ppFMT) that you can practice on this week or next if you want....just let me know and I'll send more info.
I worked with Dave W1HKJ on a new capability in FLDigi called "FMT" which is an extremely accurate frequency measurement capability.
http://www.w1hkj.com/files/fldigi/

The best one can do with this is on the order of 1 millihertz accuracy.  Doing this will likely require you to have a programmable GPSDO like the Bodnar Mini GPS.  Using one allowa you to put a reference frequency right next to the "Unknown" and you can correct for rig drift and frequency inaccuracies using this method.  The CSV file that FLDigi generates has this correction built in.You can see the results from this last Sunday's quick test that Connie K5CM did where the FLDigi users are most all < 0.5Hz.  Doppler can get in the way of course which explains most of the error seen.http://k5cm.com/nov%2001%202020%20fmt.htm

For example...here's my measurement of 2.5MHz WWV during one of it's stable periods.
| Average: | 2500000.0011 |
| Std Dev: | 0.011419748 |






Mike W9MDB