On 2/21/2019 4:04 PM, Bob McGraw K4TAX wrote:
And in a pileup the RX bandwidth is narrower. At 50 Hz BW any 12 to 15 Hz away aren't heard.
Not really, and for several reasons. First, many skilled CW ops use a fairly wide bandwidth in a pileup so that they hear off-frequency callers. Second, even at the 200 Hz IF setting and 250Hz roofing filter I routinely use, the -6dB bandwidth is on the order of 250 Hz (it's generally well known that the 250 Hz filter is closer to 350 Hz). Given that 6 dB is roughly one S-unit, the practical RX bandwidth is more like 250 Hz for reasonably strong signals, and reasonably strong signals farther off frequency are going to be heard. Third, in a pileup, the WORST place to be is zero-beat, because that's where most stations call, and everyone's TX blends into a big mush.
You DO want to zero-beat the CQer if you're weak and there are no other callers.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
