Try to use a car battery and check if the humm is still there, if yes than most likely is something inside the K3, if not than concentrate on PS. I've put on mine some big chocke on K3 DC input and I'm using SEC1223 with no hum problems
VE3GNO Daniel ________________________________ From: Hunsdon Cary III <[email protected]> To: [email protected] Cc: Wyatt Henry Wyatt <[email protected]> Sent: Monday, January 23, 2012 10:10:50 AM Subject: [Elecraft] K3 Hum on transmit K3 Experts: My K3-100 has been flawless in its performance until yesterday. I had a schedule with W5ZNN who told me I had a hum on my signal; I put my headphones on and sure enough there it was on transmit. I tried plugging the Astron 35M directly into the AC outlet instead of the outlet strip - no luck, hum was still there. I connected the K3 to my SEC 1223 switching power supply and, you guessed it, the hum is still there. I hate to think there's something amiss with the K3 but it looks that way. Any ideas? 73, Cary, K4TM Lynchburg VAh [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 ______________________________________________________________ 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
