I had another go at the rockmite last night on 40 meters. I tuned the LDG tuner to 7.028 with the Kenwood B2000 and then substituted the rockmite for input; antenna was the 43 foot tree-slung vertical wire. The LDG has latching relays, so it stayed tuned even when the drive was removed. I started calling around 18:30 EDT (22:30 Z) and was answered by W2XB, Don in Lakeview, New York (a bit south of Hamburg, along the shore of Lake Erie). Don was using an Elecraft K3 and gave me a 349. His signal was weak but copiable (after I asked him to QRS down to around 15 wpm), so I gave him a 359. The rockmite is not very selective and there were signals up and down probably a khz, so most of the filtering was done between yours truly’s ears. This contact went back and forth three times, and I can’t say that I copied every last letter, but the signal was quite stable. So, that is QSO number 3 for the rockmite, 282 miles (~450 km) on 550 mW.
After listening to the rockmite for a while more, my head was beginning to swim. I craved the narrow filtering… no, make that any filtering whatsoever, so I fired up the Kenwood and sent a QRL on 40m. I was answered immediately by a “?”, so I cq’d, and was surprised when HA3OD, Arpi, came back to me. I believe he said that he was operating at 30W from a location near Pecs, Hungary. So, about 4600 mi (7400 km) on 5W — even better than the rockmite.
I’m pretty happy with QRP performance last night. Propagation conditions were not particularly great (prediction for the band was “fair”), but noise was less of a problem than usual. I am considering building some sort of audio filter to narrow the rockmite experience. I know that there was a rockmite filter, but I don’t believe it is still available. I’ll have to look around a bit.