[Elecraft] K3 Popping noise in headphones??

[jim]

Jim, 

Thanks.

Changing the Bose to "lo" position eliminates the background hiss (as it did
before), but the popping is there, even with my Yamaha CM-500's when the DSP
switches from 200 Hz to 150 Hz to 100 Hz, to 50 Hz.  The popping was not
there before the SYN (and software) upgrades.

I also need to "normally" run the audio knob at 12:00 noon with the Bose set
in "lo" sensitivity position and if I kick in the NR, the audio knob runs
fully clockwise (max gain) to hear the V73 on 40 meters, as an example.

Jim

W6AIM


.

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim
Brown
Sent: Saturday, October 17, 2015 10:47 PM
To: Reflector Elecraft
Subject: Re: [Elecraft] K3 Popping noise in headphones??

On Sat,10/17/2015 11:58 AM, jim wrote:
> I sent the rig in to Elecraft for upgrades AND to see if they could 
> sort out the constant hiss (with the AF gain fully counter clockwise) 
> that I heard in the Bose headphones with them set at "hi" sensitivity.

Putting on my audio engineer's hat, THAT'S the likely cause -- that is, the
"gain staging" is all wrong. The K3 has reasonably high output from the
headphone amp, and you should be setting the audio gain in the K3 in it's
normal range. Turning down the K3 AF gain and setting the Bose phones for
high is a RECIPE for hiss, and may be the cause of the clicks too.

73, Jim K9YC
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