Elecraft

K2 audio pops

7 Messages

K2 audio pops

Reply Threaded

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?

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Terry Schieler

RE: K2 audio pops

Reply Threaded

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

Re: K2 audio pops

Reply Threaded

On Jul 8, 2008, at 5:41 PM, "" <w4vpi@...> <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.
>
> 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: aa4lr@...
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901

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Norcross

Re: K2 audio pops

Reply Threaded

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 < aa4lr@... > wrote:
From: Bill Coleman [mailto: aa4lr@...]
To: w4vpi@...
Cc: elecraft@...
Date: Thu, 10 Jul 2008 08:32:21 -0400
Subject: Re: [Elecraft] K2 audio pops

 On Jul 8, 2008, at 5:41 PM, "" <w4vpi@...> <w4vpi@...> wrote: > > I have a new k2 that is all but useless as a CW rig because of audio pops...

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Ron D'Eau Claire

RE: K2 audio pops

Reply Threaded

"Pops" when keying are not normal behavior for a K2.

It is possible to cause some audio artifacts during keying because Elecraft
allows you to do something many other manufacturers do not: you can set the
T/R switching time arbitrarily short - right down to zero! The result of a
zero switching time are artifacts of some sort in the audio, since audio is
enabled while the T/R switching is actually taking place. That allows the
operator full control over the QSK behavior you want from obviously too fast
to absurdly too slow.

I don't know if that's what you are hearing. It does not sound like it.

Suggest a e-mail to support@... for some factory-level support.

Terry reported a different sort of audio "pop" that is normal for a K2. It
happens *only* when cycling the power. That is caused by electrolytic caps
charging/discharging in the audio output stage. It does not have anything to
do with keying, nor does it occur at any time except when turning power on
or off.

Ron AC7AC

-----Original Message-----

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 < aa4lr@... > wrote:
From: Bill Coleman [mailto: aa4lr@...]
To: w4vpi@...
Cc: elecraft@...
Date: Thu, 10 Jul 2008 08:32:21 -0400
Subject: Re: [Elecraft] K2 audio pops

 On Jul 8, 2008, at 5:41 PM, "" <w4vpi@...> <w4vpi@...>
 wrote: > > I have a new k2 that is all but useless as a CW rig
because of audio pops...

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Mike Harris-9

Re: K2 audio pops

Reply Threaded

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: <w4vpi@...>
To: <aa4lr@...>
Cc: <elecraft@...>
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 < aa4lr@... > wrote:
| From: Bill Coleman [mailto: aa4lr@...]
| To: w4vpi@...
| Cc: elecraft@...
| Date: Thu, 10 Jul 2008 08:32:21 -0400
| Subject: Re: [Elecraft] K2 audio pops
|
| On Jul 8, 2008, at 5:41 PM, "" <w4vpi@...> <w4vpi@...>
 wrote: > > I have a new k2 that is all but useless as a CW rig
because of audio pops...

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Darwin, Keith

RE: K2 audio pops

Reply Threaded

-----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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