[Elecraft] K3 Popping noise in headphones??

jim jbollit at outlook.com
Sat Oct 17 14:58:55 EDT 2015


Jim,

Thanks.

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.

I had them put the SYN's in, gold pins, 12 volt mod, etc. in addition to the
hiss problem.  I also included the Bose headphones (QC-15's) when sending
the rig to Elecraft.

They also upgraded firmware to latest factory revision, and I am
disappointed that the audio is now worse  (due to the popping noise) than
when it was sent in.

Others have complained about the hiss, others don't hear it, and I don't
hear it on a friend's K3 (using the same Bose headphones).  

Now I have the hiss and the popping noise when switching the DSP from 200 Hz
and down.  Interesting to note there is no popping when switching the DSP
from 200Hz and going higher in bandwidth, using the BW knob..

I have played with the AGC to see if that was causing the popping problem,
but to no avail.

Jim

W6AIM


.

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim
Brown
Sent: Saturday, October 17, 2015 9:59 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 Popping noise in headphones??

On Fri,10/16/2015 11:15 PM, Jim Bolit wrote:
> The popping is present as I rotate the BW control back to wider bandwidths
also, but the popping stops once above 200 Hz bandwidth.

Hi Jim,

I also do a lot of digging for weak signals, but I rarely go narrower than
200 Hz because I find the filter ringing on noise takes over. Yes, I'm using
the optimal setting to minimize ringing.

If you're hearing the popping and others are not, perhaps you're using more
AF gain and less RF gain than they are. If so, I suggest adjusting that
ratio in the direction of less AF gain and see if you can reach a happy
compromise. As an OT CW op, I do recognize the virtue of not using excessive
RF gain.

And maybe Wayne can do something about the switching transient in a future
firmware firmware release.

73, Jim K9YC
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