I think requiring a different drive level is normal for most amplifiers. The K3S is the only transceiver that I have owned where the output can be set differently for each band, which is wonderful. My KPA-500 is pretty tolerant of SWR 2:1 or less however that may depend on the load type. What is your 20m antenna?
John KK9A From: Joe Hutchens AJ8MH This is a question I've been wanting to ask... I've had a KPA500 for 4 years and I've noticed that 20 meters requires more drive. Most bands require 30 watts or less, but 20 requires 35-37 for 500 watts out. In the phone portion of 20, an SWR of 1.4:1 WILL cause a fault. It's just real sensitive to the load on 20. I have to use a tuner and make sure I'm close to 1.1:1. Works fine into a dummy load, but high drive is still required. I've lived with it, because I don't operate SSB very often on any band, but lately I've been chasing NPOTA stations and find myself using 20 SSB. I assembled the amp, and it's been like this from day one. Anyone else see this on 20. Just interested. Joe (AJ8MH) ______________________________________________________________ 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
