Guenter, You can figure it out, knowing the BDR of the receiver and attenuation of the (two) bandpass filters. I have a 20 meter two element beam inside a 40 meter Moxon beam, and the distance is zero to five feet, depending on how you measure it. SO2R works well at 100 watts, and a KW is just 10 dB more. Avoid direct harmonics. Of course you need to use conservative design in grounding, coax, feed line placement etc.
Chas W1CG At 04:21 PM 4/25/2007, guenter wrote: >Sorry to come again with the bandpass/lowpass question: > >Any idea, what distance is needed to dim the 80m 1kW signal from ANT1 to 1mW >on a (maybe) 20m antenna feeding the second RX? > >Guenter > > >Am Mittwoch, 25. April 2007 20:36 schrieb William Hein: > > Interesting, I'll have to get my head around triplex contesting! > > > > However, having two separate transceive and keying 'channels' within the > > Flex-5000 would accomplish the same thing, I think, a bit more elegantly. > > If Receiver 2 could be routed to ANT1, ANT2 or ANT3 as well as RX1 and RX2 > > this would seem to be possible. In other words, for example, assign 20M to > > RX1-ANT1 and 15M to RX2-ANT2 and bounce the TX and PA keying between ANT1 > > and ANT2 as necessary. This scenario assumes the second RX option > > installed. > > > > I can't imagine SO2R or multiop contesting without quality external BPFs > > between the rig and the PA (and stub filters after the PA). It always > > helps to knock down the TX harmonics, for example, if you're trying to > > listen to a weak station on 28010 while you're simultaneously transmitting > > on say 14004. BPFs can help with broadband transmitted phase noise as > > well, some modern ham rigs have really dirty transmitters (not sure about > > Flex-Radio). > > > > 73, > > Bill NT1Y >. . dropped > >_______________________________________________ >FlexRadio mailing list >[email protected] >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >FlexRadio Knowledge Base: http://kb.flex-radio.com/ >FlexRadio Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
