"Here is what I've done for the test: - bypass the internal KAT4 ATU - de-tune my Palstar BT1500A external tuner for an SWR of about 1:2 - use the keyer to send in CW. SWR (bargraph in display) shows 1:2. Okay! - use the MH4 to send in USB and say "aaaah". SWR shows 1:2. Okay! - use the MH4 to send in AM (carrier only). SWR shows 1:1. Not okay! (?) - use the MH4 to send in AM and additionally say "aaaah". SWR shows 1:2. Maybe okay. (??) - use the MH4 to send in FM (carrier only). SWR shows 1:2. Okay! - use the TUNE butten in WSJT-X to send in DATA. SWR shows 1:1. Not okay!
In every mode, using the TUNE button of the K4 shows an SWR of 1:2. Okay!" For each of the cases that gives misleading 1:1 indication - What is the reading if you increase the output power? Reason for the question is that KAT500 has an insensitive bridge and always gives misleading 1:1 SWR reading at low power. I wrote code to invalidate and dash my display of the serial data SWR based on forward power level. Perhaps a similar issue in K4. Andy, k3wyc ______________________________________________________________ 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
