K2 audio pops

[w4vpi]

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[Terry Schieler]

W4VPI wrote:

<I have a new k2 that is all but useless as a CW rig because of audio pops
when transition from tx to rx.  Pop is also present when power on or pwr
off, vol setting no difference in level of pop. Worse with NR off.>

I sent my K2 back to Elecraft a little more than a year ago because of
annoying audio pops in the speaker during power up and power down.  After a
thorough check, it was returned to me with an explanation that it was a
"normal" occurrence.

Having my K3 for several months now, I am learning to live with the same
type of annoying audio pops on power up.  I was hoping there would be some
way to fix this in the software (perhaps a slight delay in the audio line
during power up like other ham rigs and stereo gear).  They are the only two
rigs I own that display this quirk.

Terry, W0FM

K2 #3416
K3  #474

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[Bill Coleman-2]

On Jul 8, 2008, at 5:41 PM, "" <[hidden email]> <[hidden email]>  
wrote:
>
> I have a new k2 that is all but useless as a CW rig because of audio  
> pops when transition from tx to rx.  Pop is also present when power  
> on or pwr off, vol setting no difference in level of pop. Worse with  
> NR off.
>
> There is mention of this problem in years past, but nothing recent,  
> and no good info that I can find. Has anyone seen this in a recent  
> production rig? any ideas?

When I first built my K2/100 #2548, I found that the QSK pops to be  
objectionable. At the time, I was using headphones through a breakout  
box connected to the speaker jack.

When I plugged the headphones into the front panel headphone jack, the  
pops were gone. At least, they were no longer objectionable.

Looking at the schematic, the headphone jack has capacitors across the  
output that aren't present on the speaker. I haven't had a complaint  
since.

You can also reduce the magnitude of the QSK pops by increasing the T-
R delay time. Elecraft recommends 0.04 to 0.05.

As for the power on / off pops -- I just power up the rig before I  
slip on the headphones.

Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

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[w4vpi]

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[AC7AC]

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[Mike Harris-9]

G'day,

K2 #1400 doesn't pop.  I've removed the KDSP2 audio filter and
re-installed the KAF2 so that I have an analogue receiver to compare with
the K3.  The DSP didn't really do anything for me.

Regards,

Mike VP8NO

----- Original Message -----
From: <[hidden email]>
To: <[hidden email]>
Cc: <[hidden email]>
Sent: Friday, July 11, 2008 12:33 PM
Subject: Re: [Elecraft] K2 audio pops


|
| OK FB Bill, thanks for the info. The main reason I got the k2 is because
of the excellent reputation as a CW rig.  I can't understand why a cw rig
such as this has to be operated in a special way to limit pops.  I am sure
the Ten-Tec guys are laughing at the fact that some k2 ops can't enjoy QSK
!
|
| The pops are present on the headphone as well as the speaker, and when
in the Test mode or not in test mode.
| The Noise reduction helps, but does not remove the offenders. Some
previous posts have wondered if the audio pops are becasue of a "mute
delay" that is not operating properly. The elecraft site has a reference
to this problem, but the link to a mod is broken. It is a old link.
| I was hoping to get more info on the Mod and other possible fixes
without having to change my ops style (no QSK).  thanks.
|
|
|
|
| --- On Thu 07/10, Bill Coleman < [hidden email] > wrote:
| From: Bill Coleman [mailto: [hidden email]]
| To: [hidden email]
|     Cc: [hidden email]
| Date: Thu, 10 Jul 2008 08:32:21 -0400
| Subject: Re: [Elecraft] K2 audio pops
|
| <br>On Jul 8, 2008, at 5:41 PM, "" <[hidden email]> <[hidden email]>
<br>wrote:<br>><br>> I have a new k2 that is all but useless as a CW rig
because of audio pops...

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[Darwin, Keith]

-----Original Message-----
The main reason I got the k2 is because
of the excellent reputation as a CW rig.  I can't understand why a cw
rig
such as this has to be operated in a special way to limit pops.  I am
sure
the Ten-Tec guys are laughing at the fact that some k2 ops can't enjoy
QSK
-------------------------

I've had several TenTec rigs.  Their QSK is thumpy & clicky.  My K2
(since sold) was very smooth and artifact free in comparison.  That's
the good news.  The bad news is the switch over time was a bit longer in
the K2 so listening between dits at 25 wpm didn't work so well on the
K2.

If you set the K2's T/R delay time to 0 you'll get more switching
artifacts.  If you run the rig's output through an audio filter that
isn't well filtered, you may get RFI induced thumps in your audio.

After using the K2, there is no way I'd go back to a TenTec.  I love 'em
but the K2's QSK is so much smoother to use, provided you (like me)
don't have to have true QSK switch over times.  Na, I don't think TenTec
is laughing at all.

- Keith N1AS -
- K3 711 -
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