It is very easy to put a hairpin coil on your top band vertical and bring the resonant SWR to 1:1. This should give you much more usable SWR bandwidth for the KPA1500. Many commercial tube amplifiers will only tolerate 2:1 SWR.
John KK9A >From Wes Stewart n7ws Fri Apr 21 13:11:12 EDT 2017 I'm not necessarily defining a personal situation. But almost any 80 or 160 antenna will suffice as an example. I am currently constructing a vertical for those bands. The model shows 2:1 on 160 at resonance and >3:1 just 60 KHz away and this is with considerable ground loss. Less loss would equal lower BW. With quarter wave resonance on 80 at 3.6 MHz it exceeds 3:1 at 3.8 MHz and is nearly 7:1 at 4.0. Transmission line loss is a non-issue with 7/8" Heliax. ______________________________________________________________ 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]
