I think I'm missing something here. I'm not sure I understand putting the ATU after the filter since the ATU is internal. How does one put it after the external BP filter?
On Fri, Jun 23, 2017 at 7:03 PM, Don Wilhelm <[email protected]> wrote: > What Matt said is true. However, if your antennas are close to resonance, > go ahead and use the ATU to "touch up" the tuning. > > If you are trying to use a multiband antenna such as a G5RV and such, you > might as well forget the advantage of the bandpass filter. > > Our local club discovered that multiband antennas were a major problem at > multi-transmitter Field Day sites. We now use single band dipoles, and yes > we use a bandpass filter for each of the FD bands. > > 73, > Don W3FPR > > On 6/23/2017 4:35 AM, Matt Maguire wrote: >> >> The problem is that the filter is designed to work with a 50 ohm >> characteristic impedance (ie. with a 1:1 VSWR). This means you need to put >> ATU *after* the filter, not before, otherwise the filter will not work >> properly. > > ______________________________________________________________ > 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] ______________________________________________________________ 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]
