goldtr8 wrote > > Dear All, > > Since I am contemplating adding the sub-receiver I will need matched > filters for diversity. > > Currently I have the 2.7 Khz 5 pole and since filters need to be matched > I was thinking to go directly to the 2.8 8 pole filters. >
For unmatched 2.7k SSB filters, simply set both offsets to the average of the two (e.g. for -0.79 and -0.85, set both to -0.82). You'll never notice 30 Hz shift in a ~2800 Hz filter (actual BW of 5-pole 2.7k) and you'll save $300. RX IMD is not a real issue on SSB since TX IMD (i.e. splatter from SSB signals being received) is about 60 dB worse. Even if it was, there's little difference in RX IMD performance between 5-pole and 8-pole filters (maybe 1-2 dB for narrow CW filters). 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/IMD-and-2-8-hz-tx-filter-question-tp7143986p7144307.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
