04/29/2020
The results of the spring 2020 ARRL Frequency Measuring Test (FMT), conducted on April 24, have been posted. Coming in at the top of the list for stations entering readings of both the 40-meter and 80-meter frequencies was Steve Cerwin, WA5FRF. His average error rate was 0.004902 parts per million (ppm).The Top 10 looked like this, with average error rates in ppm. Bill De Carle, VE2IQ, has posted a ranked list[1] of participants who submitted readings for both frequencies.
1.
WA5FRF
0.004902
2.
WA2IKL
0.005584
3.
N7WS
0.005636
4.
N9CIF
0.006999
5.
NJ0U
0.007051
6.
N8OBJ
0.007655
7.
AD5MT
0.008415
8.
KB3UMD
0.008415
9.
WB6RJH
0.008492
10
AB4RS
0.009174
Today's FMTs are conducted completely online, with no manual log-checking or intervention. Connie Marshall, K5CM, provides Bruce Horn, WA7BNM, with the precise actual frequencies, participating individuals submit their measurements, and machines handle the rest. Ninety-eight radio amateurs took part on the April 2020 FMT. The next FMT will take place in November.
Taking part in the FMT does not require special laboratory equipment. Modern HF transceivers can measure frequency quite accurately, and SDR-based receivers and available software can enable precise frequency measurements. Today's FMT leaders are able to accurately measure beyond the number of decimal places (out to 5) that a typical transceiver will display, however. One station participating in the 2019 spring FMT used an Elecraft KX3 and Spectrum Lab audio software. Another employed his Elecraft K3 transceiver and tuning forks to get within 1 Hz of the mark on both bands.
Some information[2] on how to measure the frequency of a carrier is available on Marshall's website as well as in past articles in QST. Visit the FMT-Nuts[3] discussion group on groups.io.
[1]
http://k5cm.com/rankings202020.txt
[2]
http://www.k5cm.com/
[3]
https://groups.io/g/fmt-nuts
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