[Elecraft] K3 Hum on transmit

[Hunsdon Cary III]

Don:
	You know it's hard to tell the difference between a buzz and a 60 hertz hum, at least to my 66 year old ears.  HOWEVER, when I disconnected the mic front the front panel connector and used the XMIT button on the front panel, there is no buzz or hum!  I'll start troubleshooting the mic cable now!
	Tnx for your help.
	73,
	Cary, K4TM

On Jan 23, 2012, at 10:23 AM, Don Wilhelm wrote:

> Cary,
> 
> Is it hum or is it actually "buzz"?  Hum is 60 Hz AC, but buzz will be of various frequencies, and it is difficult to tell them apart with just your ears as detectors.
> 
> Does it disappear if the microphone is not connected?  Use XMIT to put the K3 in transmit while you are listening.  If it is only when the microphone is connected, you may have a broken wire in the mic cable.
> 
> 73,
> Don W3FPR
> 
> On 1/23/2012 10:10 AM, Hunsdon Cary III wrote:
>> 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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H. Cary III
h3cary at gmail.com