On 2018-05-26 2:11 PM, Joseph Reed wrote: > I agree it is a weak signal mode.
...
Unfortunately the advent of FT-8 has introduced a large number of
> individuals not brought up in the tradition of using low power to > communicate on a weak signal mode. *WHEN* will people get it through their heads that WEAK SIGNAL is not the same as low power? The original "weak signal" mode is EME yet almost 100% of EME work is done with high power - 1500 W on CW and often 1000 W (or more) even with JT65 - plus extremely high gain antennas (well in excess of the largest "stacked arrays" on HF). *THERE IS NO "TRADITION" OF LOW POWER FOR WEAK SIGNAL MODES* Conflating weak signal and low power is an artifact of PSK31/63/125 HF operation where lids run a 2 - 3 KHz wide passband or SDR rigs with no RF/IF filters and then complain when strong, adjacent signals overdrive their (cheap) sound cards or drive the IF/mixer/ADC of their cheaply designed transceiver into distortion or overflow. Use the same techniques that have been used for decades with *WEAK* *SIGNAL* modes - narrow IF filters, strong preamplifiers, IF chains with high compression levels, mixers with high IMD thresholds, etc. - and there is no conflict between high transmit power and weak signal modes. 73, ... Joe, W4TV ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
