You bet. The Johnson Matchbox is as good as any expensive band pass filter.
Victor 4X6GP > On 11 Oct 2019, at 2:57, Joe Subich, W4TV <li...@subich.com> wrote: > > > The one "multiband" antenna one can use in a multi-transmitter > configuration is the flat-top with open wire feeders and a > *Link coupled* tuner. The link coupled tuner is a bandpass filter > that significantly reduces harmonic/broadband noise just like the > "Q" of a single band antenna. > > 73, > > ... Joe, W4TV > > >> On 2019-10-10 7:44 PM, Don Wilhelm wrote: >> Bob, >> Bandpass filters at each station will help a lot, but they do not have >> infinite out of band rejection. >> There is still a huge benefit with single band antennas. My club uses both. >> Last Field Day (3F operation) one station got on the air with a multiband >> vertical, and all other operators jumped on that operator to shut him down >> quickly! The multi-band antenna radiated harmonics of the radio. Even >> though the transmitter met the -43 dB harmonic required by the FCC, the >> proximity of the multiband antenna to other antennas caused problems (that >> station was not using a bandpass filter). >> So for Field Day multi-station operation, single band antennas, bandpass >> filters and transmitters with low phase noise are important. We were not >> able to orient the antennas end to end due to space considerations at the >> EOC site, so we had to compromise on that, which makes the other factors >> very important. >> I need to point out that as an experiment, a 2nd station used an antenna on >> 20 meters separated from the main 20 meters, and we were able to operate one >> on CW (K3) at the same time as the other station (Icom) used digital and SSB >> modes. We had some mutual interference, but it was minimal. The K3 did not >> interfere much with the Icom due to the K3's low phase noise, but the Icom >> did raise the background noise level on the K3. >> 73, >> Don W3FPR > > ______________________________________________________________ > 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 > Message delivered to k2vco....@gmail.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 Message delivered to arch...@mail-archive.com
