[Elecraft] Fwd: Crackling in Headphones

[Jim Bolit]

For us old timers, it sounds like a crackly vacuum tube (not microphonic) but a crackling mixing tube in the eye of chain

I don't recall the exact mixer in the old Drake r4c series, but it was a common occurrence happening about 1 out of 3 times which caused one to have a box of tubes using them to substitute until you could find one that was quiet

Rob Sherwood designed a solid state mixer circuit that many Drake users purchased to eliminate this problem


Jim
W6AIM





-------- Original message --------
From: Jim Bolit <jbollit at outlook.com>
Date: 11/30/2015 7:32 AM (GMT-08:00)
To: elecraft at mailman.qth.net
Subject: [Elecraft] Fwd: Crackling in Headphones


Nope, not on mine. It also occurs when the antenna is completely disconnected.

I have spent hours troubleshooting this to determine the source of the problem and in my case it is clearly inside the radio.

Jim
W 6 A I M


.


-------- Original message --------
From: "zabarnick ." <zabarnick at gmail.com>
Date: 11/30/2015 7:08 AM (GMT-08:00)
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Crackling in Headphones

Could this be the AF limiter kicking in on loud signals? Check the "AF
LIM" menu setting.

Steve
N9SZ


On 30 Nov 2015 14:02, john at kk9a.com wrote:
> There are times that I have noticed a crackling sound in my headphones
> with my K3S. This is not the normal band noise static that has depth, this
> crackle sound seems very close to my ears.  I first noticed it with my
> Heil headset and I tried wiggling the connection, changing the RX EQ
> settings and turning on noise reduction but nothing had any effect. It
> randomly comes and goes and I think I have also heard it on TX. I thought
> perhaps it was related to the Heil brand headphones. Last night I plugged
> in a new Sony professional headphone and the crackling sound was very
> strong for a few minutes and then eventually went away. I have never
> experience this with any other radio and I have no idea what is causing it
> or how to make it go away.
>
> John KK9A
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