Re: [Elecraft_K3] K3 - background hiss (noisy K3) - update
Mel Farrer <farrerfolks@...>
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Might I ask if you have tried to isolate the source? In the tube days a gentle hiss was attributed to the electron bombardment of the plate from the cathode and was never "completely" eliminated. While we are now in the days of SS, that issue is mute. However, I suggest as mentioned earlier, that you might have a external source of the "hiss".
I would connect a scope to the audio output through a 1:1 audio isolation transformer and determine the frequency bandwidth and characteristics of the "hiss". Then start isolating the K3 from all connections down to running it on a floating battery.
I do not have your "hiss" and I am totally battery powered from solar. That includes shorting the antenna terminals after reading your thread. Hope you find the source,
From: "mikerodgerske5gbc@... [Elecraft_K3]" <Elecraft_K3@...>
Sent: Thursday, October 1, 2015 8:22 PM
Subject: Re: [Elecraft_K3] K3 - background hiss (noisy K3) - update
I tried this on k3 5047 using some cheap earbuds and I plugged in my dusty cm500's.
I can barely detect anything, even less so with the cm500. Plugged into the external speaker jack.
Is it possible you are picking up something through a ground loop condition?
Find me on "Zello", a walkie talkie or handi talkie type app. I'm listed as KE5GBC. I'm mostly on late at night.