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K3 Popping noise in headphones??

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Jim Bolit

K3 Popping noise in headphones??

I just got my K3 back from Elecraft. They did the once over and installed
the new SYN boards.

I have noticed a "popping" noise in the headphones as I change the bandwidth
control, but ONLY as I transition from 200 Hz, 150 Hz, 100 Hz and 50 Hz. I
have only checked this in the CW mode.

This popping noise was not there before sending the rig in.

I have the 500 Hz and 200 Hz crystal roofing filters installed, which is the
same configuration as I had before sending it to Elecraft.

Any thoughts?

Tnx

Jim

W6AIM

.

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Vic Rosenthal

Re: K3 Popping noise in headphones??

Yes, I have it too, and I didn't notice it before installing the new synths. Doesn't bother me.

Vic
Sent from my phone

> On Oct 17, 2015, at 4:01 AM, jim <[hidden email]> wrote:
>
> I just got my K3 back from Elecraft. They did the once over and installed
> the new SYN boards.
>
>
>
> I have noticed a "popping" noise in the headphones as I change the bandwidth
> control, but ONLY as I transition from 200 Hz, 150 Hz, 100 Hz and 50 Hz. I
> have only checked this in the CW mode.
>
>
>
> This popping noise was not there before sending the rig in.
>
>
>
> I have the 500 Hz and 200 Hz crystal roofing filters installed, which is the
> same configuration as I had before sending it to Elecraft.
>
>
>
> Any thoughts?
>
>
>
> Tnx
>
>
>
> Jim
>
> W6AIM
>
>
>
>
>
> .
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Jim Bolit

Re: K3 Popping noise in headphones??

In reply to this post by Jim Bolit

I use the BW control a lot as most of my work is weak signal CW.
There was no popping before, and my ears are "on max gain" with weak signals, that are at or near the noise floor. The popping is VERY annoying and at times it "hurts" the ears when digging for signals and changing the BW control from 200 Hz to 150 Hz, to 100 Hz and finally to 50 Hz. The popping is present as I rotate the BW control back to wider bandwidths also, but the popping stops once above 200 Hz bandwidth.
JimW6AIM

.

-------- Original message --------
From: Vic Rosenthal <[hidden email]>
Date: 10/16/2015 10:42 PM (GMT-08:00)
To: jim <[hidden email]>
Cc: "<[hidden email]>" <[hidden email]>
Subject: Re: [Elecraft] K3 Popping noise in headphones??

Yes, I have it too, and I didn't notice it before installing the new synths. Doesn't bother me.

Vic
Sent from my phone

N2TK

Re: K3 Popping noise in headphones??

I can't duplicate it here on either K3.
73,
N2TK, Tony

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Jim
Bolit
Sent: Saturday, October 17, 2015 2:15 AM
To: Vic Rosenthal <[hidden email]>
Cc: <[hidden email]> <[hidden email]>
Subject: Re: [Elecraft] K3 Popping noise in headphones??

I use the BW control a lot as most of my work is weak signal CW.
There was no popping before, and my ears are "on max gain" with weak
signals, that are at or near the noise floor. The popping is VERY annoying
and at times it "hurts" the ears when digging for signals and changing the
BW control from 200 Hz to 150 Hz, to 100 Hz and finally to 50 Hz. The
popping is present as I rotate the BW control back to wider bandwidths also,
but the popping stops once above 200 Hz bandwidth.
JimW6AIM

.

-------- Original message --------
From: Vic Rosenthal <[hidden email]>
Date: 10/16/2015 10:42 PM (GMT-08:00)
To: jim <[hidden email]>
Cc: "<[hidden email]>" <[hidden email]>
Subject: Re: [Elecraft] K3 Popping noise in headphones??

Yes, I have it too, and I didn't notice it before installing the new synths.
Doesn't bother me.

Vic
Sent from my phone

> On Oct 17, 2015, at 4:01 AM, jim <[hidden email]> wrote:
>
> I just got my K3 back from Elecraft. They did the once over and
> installed the new SYN boards.
>
>
>
> I have noticed a "popping" noise in the headphones as I change the
> bandwidth control, but ONLY as I transition from 200 Hz, 150 Hz, 100
> Hz and 50 Hz. I have only checked this in the CW mode.
>
>
>
> This popping noise was not there before sending the rig in.
>
>
>
> I have the 500 Hz and 200 Hz crystal roofing filters installed, which
> is the same configuration as I had before sending it to Elecraft.
>
>
>
> Any thoughts?
>
>
>
> Tnx
>
>
>
> Jim
>
> W6AIM
>
>
>
>
>
> .
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]

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Tony Scandurra K4QE

Re: K3 Popping noise in headphones??

I note the popping here as well.

K3 #6478 with new synths and FW REVS uC-5.38, d1-2.86, d2-2.86, FL 1.25, dr
1.03.

Also have 700Hz and 250 Hz filters installed.

73, Tony K4QE

On Sat, Oct 17, 2015 at 8:34 AM, N2TK, Tony <[hidden email]> wrote:

> I can't duplicate it here on either K3.
> 73,
> N2TK, Tony
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of Jim
> Bolit
> Sent: Saturday, October 17, 2015 2:15 AM
> To: Vic Rosenthal <[hidden email]>
> Cc: <[hidden email]> <[hidden email]>
> Subject: Re: [Elecraft] K3 Popping noise in headphones??
>
> I use the BW control a lot as most of my work is weak signal CW.
> There was no popping before, and my ears are "on max gain" with weak
> signals, that are at or near the noise floor. The popping is VERY annoying
> and at times it "hurts" the ears when digging for signals and changing the
> BW control from 200 Hz to 150 Hz, to 100 Hz and finally to 50 Hz. The
> popping is present as I rotate the BW control back to wider bandwidths
> also,
> but the popping stops once above 200 Hz bandwidth.
> JimW6AIM
>
>
> .
>
> -------- Original message --------
> From: Vic Rosenthal <[hidden email]>
> Date: 10/16/2015 10:42 PM (GMT-08:00)
> To: jim <[hidden email]>
> Cc: "<[hidden email]>" <[hidden email]>
> Subject: Re: [Elecraft] K3 Popping noise in headphones??
>
> Yes, I have it too, and I didn't notice it before installing the new
> synths.
> Doesn't bother me.
>
> Vic
> Sent from my phone
>
> > On Oct 17, 2015, at 4:01 AM, jim <[hidden email]> wrote:
> >
> > I just got my K3 back from Elecraft. They did the once over and
> > installed the new SYN boards.
> >
> >
> >
> > I have noticed a "popping" noise in the headphones as I change the
> > bandwidth control, but ONLY as I transition from 200 Hz, 150 Hz, 100
> > Hz and 50 Hz. I have only checked this in the CW mode.
> >
> >
> >
> > This popping noise was not there before sending the rig in.
> >
> >
> >
> > I have the 500 Hz and 200 Hz crystal roofing filters installed, which
> > is the same configuration as I had before sending it to Elecraft.
> >
> >
> >
> > Any thoughts?
> >
> >
> >
> > Tnx
> >
> >
> >
> > Jim
> >
> > W6AIM
> >
> >
> >
> >
> >
> > .
> >
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net Please help support this email
> > list: http://www.qsl.net/donate.html Message delivered to
> > [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message
> delivered to [hidden email]
>
> ______________________________________________________________
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> Post: mailto:[hidden email]
>
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> Message delivered to [hidden email]
>

Mike K2MK

Re: K3 Popping noise in headphones??

In reply to this post by Jim Bolit

Hi Jim,

I have an older K3 with new SYN boards. I also have the 500Hz and 200Hz filter. I just tested it on CW and I can hear a very faint pop when turning the bandwidth knob. As you noted, it seems to be present only at the narrow settings. I start to hear it when changing from 350 to 300 and below. It's loudest when changing from 150 to 100.

Having said that, it's faint to the point that I can't be sure if it was there before the SYN changeover or not. It certainly doesn't bother me even with high audio levels.

73,
Mike K2MK

Jim Bolit wrote

I just got my K3 back from Elecraft. They did the once over and installed
the new SYN boards.

I have noticed a "popping" noise in the headphones as I change the bandwidth
control, but ONLY as I transition from 200 Hz, 150 Hz, 100 Hz and 50 Hz. I
have only checked this in the CW mode.

This popping noise was not there before sending the rig in.

I have the 500 Hz and 200 Hz crystal roofing filters installed, which is the
same configuration as I had before sending it to Elecraft.

Any thoughts?

Tnx
Jim
W6AIM

Jim Brown-10

Re: K3 Popping noise in headphones??

In reply to this post by Jim Bolit

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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Jim Bolit

Re: K3 Popping noise in headphones??

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:[hidden email]] On Behalf Of Jim
Brown
Sent: Saturday, October 17, 2015 9:59 AM
To: [hidden email]
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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riese-k3djc

Re: K3 Popping noise in headphones??

In reply to this post by Jim Bolit

the only time I notice that issue is if I have the auto notch set
and tune around the band,, I just turn off auto notch and
it clears up ??

Bob K3DJC

On Sat, 17 Oct 2015 09:59:21 -0700 Jim Brown <[hidden email]>
writes:
> 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.

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Jim Bolit

Re: K3 Popping noise in headphones??

No notch filter (auto or otherwise) is engaged.

Jim
W6AIM

.

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of
[hidden email]
Sent: Saturday, October 17, 2015 12:33 PM
To: [hidden email]
Subject: Re: [Elecraft] K3 Popping noise in headphones??

the only time I notice that issue is if I have the auto notch set and tune
around the band,, I just turn off auto notch and
it clears up ??

Bob K3DJC

On Sat, 17 Oct 2015 09:59:21 -0700 Jim Brown <[hidden email]>
writes:
> 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.

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Elecraft mailing list

Re: K3 Popping noise in headphones??

In reply to this post by Jim Bolit

I can verify that I get the popping (more like a click) and it's loudest
between 150 and 100 Hz transition. It doesn't bother me. My K3 is S/N 1326
and I have the new synth installed.

Bert, N4CW
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Jim Brown-10

Re: K3 Popping noise in headphones??

In reply to this post by Jim Bolit

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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Tony Scandurra K4QE

Re: K3 Popping noise in headphones??

The clicks are there regardless of the level of the AF gain setting. The
loudness of the clicks is affected by the AF gain setting, but they are
still there.

I'm using a Yamaha CM500 headset.

It is the strongest when moving between the 0.10 and 0.15 bandwidth
setting, but also occurs going between 0.15 and 0.20.

73, Tony K4QE

On Sun, Oct 18, 2015 at 1:47 AM, Jim Brown <[hidden email]>
wrote:

> 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
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

N2TK

Re: K3 Popping noise in headphones??

In reply to this post by Elecraft mailing list

Took a closer listen for this. I need to set the audio level above 12
o'clock to hear the pop at narrow bandwidths. But I never operate with the
audio control that high. So, it has not been an issue for me. Typically I
have the RF Gain about 3:30 and the AF Gain at about 9:30.

73,
N2TK, Tony
#311, #1435

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Bert
via Elecraft
Sent: Saturday, October 17, 2015 10:18 PM
To: [hidden email]
Subject: Re: [Elecraft] K3 Popping noise in headphones??

I can verify that I get the popping (more like a click) and it's loudest
between 150 and 100 Hz transition. It doesn't bother me. My K3 is S/N 1326
and I have the new synth installed.

Bert, N4CW
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Jim Bolit

Re: K3 Popping noise in headphones??

In reply to this post by Jim Brown-10

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:[hidden email]] 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
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
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Jim Bolit

Re: K3 Popping noise in headphones??

In reply to this post by Tony Scandurra K4QE

Tony,

Thanks.

I also noticed there are no clicks or pops when I change the DSP with the
XFIL button. The roofing filters change, the DSP moves to the corresponding
BW when using the XFIL button, no clicks!

Jim

W6AIM

.

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of
Anthony Scandurra
Sent: Sunday, October 18, 2015 6:47 AM
To: [hidden email]
Cc: Reflector Elecraft
Subject: Re: [Elecraft] K3 Popping noise in headphones??

The clicks are there regardless of the level of the AF gain setting. The
loudness of the clicks is affected by the AF gain setting, but they are
still there.

I'm using a Yamaha CM500 headset.

It is the strongest when moving between the 0.10 and 0.15 bandwidth setting,
but also occurs going between 0.15 and 0.20.

73, Tony K4QE

On Sun, Oct 18, 2015 at 1:47 AM, Jim Brown <[hidden email]>
wrote:

> 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
>
> ______________________________________________________________
> Elecraft mailing list
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Wes (N7WS)

Re: K3 Popping noise in headphones??

In reply to this post by Jim Bolit

As a point of reference, my old K3 with the original synthesizer board pops when
changing BW. It's most noticeable going from 150 Hz to 100 Hz and vice versa.
This is with normal AF gain and CM500 in rear headphone jack.

On 10/16/2015 6:01 PM, jim wrote:

> I just got my K3 back from Elecraft. They did the once over and installed
> the new SYN boards.
>
>
>
> I have noticed a "popping" noise in the headphones as I change the bandwidth
> control, but ONLY as I transition from 200 Hz, 150 Hz, 100 Hz and 50 Hz. I
> have only checked this in the CW mode.
>
>
>
> This popping noise was not there before sending the rig in.
>
>
>
> I have the 500 Hz and 200 Hz crystal roofing filters installed, which is the
> same configuration as I had before sending it to Elecraft.
>
>
>
> Any thoughts?
>
>
>
> Tnx
>
>
>
> Jim
>
> W6AIM
>
>

Joe Subich, W4TV-4

Re: K3 Popping noise in headphones??

On 10/18/2015 11:46 AM, Wes (N7WS) wrote:
> As a point of reference, my old K3 with the original synthesizer
> board pops when changing BW. It's most noticeable going from 150 Hz
> to 100 Hz and vice versa.

There will be a slight pop when changing bandwidth between 150 and 100
Hz as the K3/K3S disables the RXEQ at bandwidths less than 150 Hz. The
level of the "pop" will be related to the amount of EQ in use *around*
*the center of the passband* (e.g., "pitch"). If for example, pitch is
500 Hz and bands 4 (400 Hz) and 5 (800 Hz) are 0, there will be little
or no "pop". However, if one has 400/800 Hz set for significant boost
there will be a fairly loud "pop" as the level changes.

73,

... Joe, W4TV

On 10/18/2015 11:46 AM, Wes (N7WS) wrote:

> As a point of reference, my old K3 with the original synthesizer board
> pops when changing BW. It's most noticeable going from 150 Hz to 100 Hz
> and vice versa.
> This is with normal AF gain and CM500 in rear headphone jack.
>
> On 10/16/2015 6:01 PM, jim wrote:
>> I just got my K3 back from Elecraft. They did the once over and
>> installed
>> the new SYN boards.
>>
>>
>> I have noticed a "popping" noise in the headphones as I change the
>> bandwidth
>> control, but ONLY as I transition from 200 Hz, 150 Hz, 100 Hz and 50
>> Hz. I
>> have only checked this in the CW mode.
>>
>>
>> This popping noise was not there before sending the rig in.
>>
>>
>> I have the 500 Hz and 200 Hz crystal roofing filters installed, which
>> is the
>> same configuration as I had before sending it to Elecraft.
>>
>>
>> Any thoughts?
>>
>>
>> Tnx
>>
>>
>> Jim
>>
>> W6AIM
>>
>>
>
> ______________________________________________________________
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> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Vic Rosenthal

Re: K3 Popping noise in headphones??

Well, I have an old K3 plus new synths, I have the RX EQ set to zero dB
all across its range, and I hear the noises. I would call them short
tone bursts rather than pops, though.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 18 Oct 2015 21:16, Joe Subich, W4TV wrote:

>
> On 10/18/2015 11:46 AM, Wes (N7WS) wrote:
>> As a point of reference, my old K3 with the original synthesizer
>> board pops when changing BW. It's most noticeable going from 150 Hz
>> to 100 Hz and vice versa.
>
> There will be a slight pop when changing bandwidth between 150 and 100
> Hz as the K3/K3S disables the RXEQ at bandwidths less than 150 Hz. The
> level of the "pop" will be related to the amount of EQ in use *around*
> *the center of the passband* (e.g., "pitch"). If for example, pitch is
> 500 Hz and bands 4 (400 Hz) and 5 (800 Hz) are 0, there will be little
> or no "pop". However, if one has 400/800 Hz set for significant boost
> there will be a fairly loud "pop" as the level changes.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 10/18/2015 11:46 AM, Wes (N7WS) wrote:
>> As a point of reference, my old K3 with the original synthesizer board
>> pops when changing BW. It's most noticeable going from 150 Hz to 100 Hz
>> and vice versa.
>> This is with normal AF gain and CM500 in rear headphone jack.
>>
>> On 10/16/2015 6:01 PM, jim wrote:
>>> I just got my K3 back from Elecraft. They did the once over and
>>> installed
>>> the new SYN boards.
>>>
>>>
>>> I have noticed a "popping" noise in the headphones as I change the
>>> bandwidth
>>> control, but ONLY as I transition from 200 Hz, 150 Hz, 100 Hz and 50
>>> Hz. I
>>> have only checked this in the CW mode.
>>>
>>>
>>> This popping noise was not there before sending the rig in.
>>>
>>>
>>> I have the 500 Hz and 200 Hz crystal roofing filters installed, which
>>> is the
>>> same configuration as I had before sending it to Elecraft.
>>>
>>>
>>> Any thoughts?
>>>
>>>
>>> Tnx
>>>
>>>
>>> Jim
>>>
>>> W6AIM

Jim Bolit

Re: K3 Popping noise in headphones??

In reply to this post by Joe Subich, W4TV-4

Joe,

Thanks for the input, I will play with those settings and reply back to the
reflector.

Jim

W6AIM

.

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Joe
Subich, W4TV
Sent: Sunday, October 18, 2015 11:17 AM
To: [hidden email]
Subject: Re: [Elecraft] K3 Popping noise in headphones??

On 10/18/2015 11:46 AM, Wes (N7WS) wrote:
> As a point of reference, my old K3 with the original synthesizer board
> pops when changing BW. It's most noticeable going from 150 Hz to 100
> Hz and vice versa.

There will be a slight pop when changing bandwidth between 150 and 100 Hz as
the K3/K3S disables the RXEQ at bandwidths less than 150 Hz. The level of
the "pop" will be related to the amount of EQ in use *around* *the center of
the passband* (e.g., "pitch"). If for example, pitch is
500 Hz and bands 4 (400 Hz) and 5 (800 Hz) are 0, there will be little or no
"pop". However, if one has 400/800 Hz set for significant boost there will
be a fairly loud "pop" as the level changes.

73,

... Joe, W4TV

On 10/18/2015 11:46 AM, Wes (N7WS) wrote:

> As a point of reference, my old K3 with the original synthesizer board
> pops when changing BW. It's most noticeable going from 150 Hz to 100
> Hz and vice versa.
> This is with normal AF gain and CM500 in rear headphone jack.
>
> On 10/16/2015 6:01 PM, jim wrote:
>> I just got my K3 back from Elecraft. They did the once over and
>> installed the new SYN boards.
>>
>>
>> I have noticed a "popping" noise in the headphones as I change the
>> bandwidth control, but ONLY as I transition from 200 Hz, 150 Hz, 100
>> Hz and 50 Hz. I have only checked this in the CW mode.
>>
>>
>> This popping noise was not there before sending the rig in.
>>
>>
>> I have the 500 Hz and 200 Hz crystal roofing filters installed, which
>> is the same configuration as I had before sending it to Elecraft.
>>
>>
>> Any thoughts?
>>
>>
>> Tnx
>>
>>
>> Jim
>>
>> W6AIM
>>
>>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]
>