[Elecraft] KPA500 Question
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
Re: [Elecraft] KPA500 Issue
Looks like the Kenwood switches high during transmit and the KPA500 requires a low for transmit. KPA500 specs in my manual say +5V max, open circuit on receive, closed to ground on transmit. My old KPA500 manual doesn't show Kenwood interconnections. Only the K3, Yaesu and Icom. Yup, ya need to supply a low to the amp. Joe ( AJ8MH ) http://webpages.charter.net/aj8mh-radio/ __ 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
Re: [Elecraft] KPA500 clicking
I have clicking, but it doesn't following the keying. (Maybe you meant AFTER keying.) It happens after a long transmission...for the most part. It has to do with flexing of the heatsink or other parts of the chassis when the unit heats and cools. I believe it's been covered here before. Joe ( AJ8MH ) http://webpages.charter.net/aj8mh-radio/ On 12/29/2014 4:58 PM, Wes (N7WS) wrote: I'm a relatively new owner of a KPA500. I'm also, thanks to the new K3 firmware, using QSK for the first time in my ham career. These two facts have led to me hearing a slight clicking noise emanating from the amp that follows the keying. This is unrelated to drive or output power, since it happens in the TX Test mode too. I understand that PIN diodes are used for RF switching but it still sounds like a reed relay to me. Any explanation? (Hint) Having a schematic would probably make this self explanatory. Wes N7WS __ 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 aj8mh-ra...@charter.net __ 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
