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Re: First HF Radio?
¿ªÔÆÌåÓýHi, Dave, I would be the first to admit that the 7300 does not have a bulletproof receiver.However, the Alachua County team set up five HF antennas, four of which were in some proximity at the freedom center at our park, based on a 50 foot tower provided for by the county, and one of which was an off-center Fed sloping vertical maybe 100 150 yards south. ? ? It was a ?4F operation with a 6 m station at the alternate site for our EOC? We did manage to operate with only ICOM 7300s, for 22 hours, on eight hours of which we were having two stations on the same band. ? Sometimes as close as CW and FT 8/FT4. ? We did have some difficulties. People had to learn how to turn on the ICOM attenuator, and they also had to learn not to use preamplifiers!!! ?At one point the 40 m CW station was coming in on three receivers, due to less than wonderful choices. After people learned about these tricks and connected up all of the bandpass filters we had built, we proceeded the entire rest of the contest with minimal difficulty. ? Over 1200 contacts, which for our group was phenomenal, because we are still relatively new at this!!!? We did organize our antennas as much as possible to separate them. ?Generally by offsetting them from the tower. See the photograph on page one. ? We just don¡¯t have fantastic equipment, and we decided to go with what we had. ? Preliminary measurements done at our dress rehearsal with a similar antenna set up suggested we had separations between 30 and 60 DB on various bands between various antennas. ?We were not always able to use the optimal separated antennas. ? Our calculation suggested we needed 50 DB or more isolation, and our band pass filters and receiver attenuators helped out a lot I operated several hours at the GOTA ?station, without any bandpass filters, often on the same band as a digital station A few tens of kHz away while I operated CW. By using the attenuator I got away with it. Most of us just don¡¯t have the money for much better than a 7300, and that has been a step up for most of us! ? More power to your group for having better equipment! 73, Gordon Kx4z On Jul 1, 2023, at 15:29, ajparent1/kb1gmx <kb1gmx@...> wrote:
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