[Elecraft] K3 Hum on transmit

[VE3GNO Daniel]

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 <h3cary at gmail.com>
To: elecraft at mailman.qth.net 
Cc: Wyatt Henry Wyatt <jandhwyatt84 at verizon.net> 
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
h3cary at gmail.com



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