FYI, last night, after I demonstrated the sBitx DE with V2 software to members of the Dayton ARA (DARA) TNG*, ?Tom Holmes (N8ZM) and I used it to participate in the ARRL Frequency Measuring Test.
During the test, after a 3-minute call-up, the source station transmitted a 1 minute carrier near (but not on) the call-up frequency. There were two transmitters: K5CM in Texas and W8RKO in Ohio (about 20 miles from us). Each transmitted ?once on each of 40 an 80.
We used a BNC tee to feed the antenna and the output of a HP 8920 Service Monitor to the input of the sBitx. We adjusted the output of the service monitor to be similar in strength to the transmitting station. During the one-minute carrier period, we adjusted the frequency of the service monitor output to zero beat the carrier (by ear). We reported the frequency of the service monitor.
*TNG - Thursday Night Group: This is a group of tech-oriented hobbyists who meet most Thursday evenings at the DARA clubhouse to work on various projects. The clubhouse has an array of test equipment.
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73,
Mark, N8ME
Mark Erbaugh