Re: K3S Audio buzz on transmit, especially AM

Posted by donovanf on Apr 26, 2019; 10:16pm
URL: http://elecraft.85.s1.nabble.com/K3S-Audio-buzz-on-transmit-especially-AM-tp7651148p7651186.html

I had this same problem years ago before purchasing my first K3.
It turned out to magnetic field coupling between my HyGain
T2X control box and an audio transformer in the transceiver.


As Don suggested, be sure all power supplies including computers,
UPSs and lamps are turned off during the test.


If this doesn't work, take to K3S to a friends QTH and repeat the test


73
Frank
W3LPL

----- Original Message -----

From: "Don Wilhelm" <[hidden email]>
To: [hidden email]
Sent: Friday, April 26, 2019 9:51:15 PM
Subject: Re: [Elecraft] K3S Audio buzz on transmit, especially AM

In addition to operating from a battery isolated from the solar system,
I would recommend that you do a quick test - remove all cables from the
K3S except the power cable and a coax to a dummy load. Power down all
power supplies in your station, including any desk lamps.
Go into Transmit by tapping the XMIT button.
Is the hum still present? If not, then start connecting things to your
K3S one at a time, doing the same test after each thing connected.

Of course, if the hum is present with nothing connected, contact
[hidden email] - but I cannot imagine a hum with harmonics of 60
Hz being induced if you take away all the 60 Hz operated sources in the
area.

73,
Don W3FPR

On 4/26/2019 5:36 PM, K8TE wrote:

> The word that struck my attention is "solar" and the possibility of that
> controller causing noise. When you were connected to just the battery and
> dummy load, was the battery disconnected from the solar system? And, at
> what level was the buzz relative to a full power carrier?
>
> Every transmitter has some noise on its signal. Specifications and FCC
> rules in some cases call for a specific ratio. I can't imagine a factory
> reset solving a problem like this. Be certain you have saved your
> configuration first. Solving issues like this is not magic, but sometimes a
> mystery.
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft 
Help: http://mailman.qth.net/mmfaq.htm 
Post: mailto:[hidden email]

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:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html