Elecraft

K2 - NOISY POLLING

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G4BUE

K2 - NOISY POLLING

Does anyone else have a problem with noisy polling with their K2 when
used with a computer logging program, and is there a cure for it?

I have two K2/100s which both have the 160m, NB and DSP options and
one has the SSB option. I am using N1MM Logger with an old desk-top
(about 300MHz) computer under Windows 98 and when I listen to the SSB
K2 on any band with the AF gain at minimum, I can hear a soft pulse
every second or so. This does not increase as the AF Gain is
advanced and normally the sound of signals, etc masks it, but it is
slightly annoying when tuning on a very quiet band.

I can just about hear it on my other K2 if I really listen hard for
it but I don't think I would have noticed it on this K2 had I not
first heard it on the SSB K2. The problem must therefore be
something to do with the SSB K2.

Gary Surrency suggested moving the ribbon cable between the K2 and
K2/100 further away from the KSB2 unit and also try switching off the
RTC (in the secondary menu). I have tried both and neither make any
difference and Gary suggested I now ask on here.

Thanks for any help.

73 de Chris, W4/G4BUE

arse just installed the repaired K2 and my own K2 in a SO2R set-up
> with N1MM Logger for contesting and have noticed that the polling
(at
> least I think that's what it is) is very noisy on the repaired K2
> compared with my own K2.
>
> I hear a continual soft pulse about every second which does not
> increase as the AF gain is increased. When I disconnect the radio
> from N1MM Logger, it goes away.
>
> Is there anything I can do to reduce the volume of the polling,
> please?

--
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Don Wilhelm-3

RE: K2 - NOISY POLLING

Chris,

Just a wild guess, but you may want to check the cable between the K2 and
the computer - make certain the cable shield is connected at the K2 end and
is NOT connected at the computer end - if the shield is connected at both
ends, you can get some induced currents on the cable, but I don't know how
it might be coupled into the K2 audio.

73,
Don W3FPR

> -----Original Message-----
>
>
> Does anyone else have a problem with noisy polling with their K2 when
> used with a computer logging program, and is there a cure for it?
>
> I have two K2/100s which both have the 160m, NB and DSP options and
> one has the SSB option. I am using N1MM Logger with an old desk-top
> (about 300MHz) computer under Windows 98 and when I listen to the SSB
> K2 on any band with the AF gain at minimum, I can hear a soft pulse
> every second or so. This does not increase as the AF Gain is
> advanced and normally the sound of signals, etc masks it, but it is
> slightly annoying when tuning on a very quiet band.
>
>

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Don Nesbitt

Re: K2 - NOISY POLLING

In reply to this post by G4BUE

Hello Chris - I am using my K2/100 with N1MM and do not notice the noise
that you are referring to. I use the K2/100 with two laptops - one an old
P1 266mhz with only 80 meg ram (yes, it works fine with N1MM as long as you
don't have anything else running!). This old computer has a "real" RS-232
port. The reason I mention that is that my other laptop is a 2.6 gig with
512 meg ram, etc but NO serial port. I have to use a USB to serial
converter cable with it. When I use that computer, I can hear the converter
creating a slow pulsing broad rf spectrum that is receivable on all the rest
of the rigs in the shack. This is true whether the K2/100 is connected to
that computer or not. Now the interesting part is that when the K2/100 is
connected to the converter, I cannot hear the noise in the K2 - only in the
other rigs. BTW - the usb to serial converter works very nicely with N1MM.
You might want to check to see if you have any ground loop between the K2
and the computer. I think the cable should be grounded at only one end to
kill the ground loop. 73 es gud dx --don n4hh K2/100 #2028 KAT100, etc.
etc.
----- Original Message -----
From: "Chris Page" <[hidden email]>
To: <[hidden email]>
Sent: Thursday, February 17, 2005 8:36 AM
Subject: [Elecraft] K2 - NOISY POLLING

> Does anyone else have a problem with noisy polling with their K2 when
> used with a computer logging program, and is there a cure for it?
>
> I have two K2/100s which both have the 160m, NB and DSP options and
> one has the SSB option. I am using N1MM Logger with an old desk-top
> (about 300MHz) computer under Windows 98 and when I listen to the SSB
> K2 on any band with the AF gain at minimum, I can hear a soft pulse
> every second or so. This does not increase as the AF Gain is
> advanced and normally the sound of signals, etc masks it, but it is
> slightly annoying when tuning on a very quiet band.
>
> I can just about hear it on my other K2 if I really listen hard for
> it but I don't think I would have noticed it on this K2 had I not
> first heard it on the SSB K2. The problem must therefore be
> something to do with the SSB K2.
>
> Gary Surrency suggested moving the ribbon cable between the K2 and
> K2/100 further away from the KSB2 unit and also try switching off the
> RTC (in the secondary menu). I have tried both and neither make any

difference and Gary suggested I now ask on here.

>
> Thanks for any help.
>
> 73 de Chris, W4/G4BUE
>
>
> arse just installed the repaired K2 and my own K2 in a SO2R set-up
> > with N1MM Logger for contesting and have noticed that the polling
> (at
> > least I think that's what it is) is very noisy on the repaired K2
> > compared with my own K2.
> >
> > I hear a continual soft pulse about every second which does not
> > increase as the AF gain is increased. When I disconnect the radio
> > from N1MM Logger, it goes away.
> >
> > Is there anything I can do to reduce the volume of the polling,
> > please?
>
>
>
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 14/02/2005
>
> _______________________________________________
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>
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>
>
> --
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> Checked by AVG Anti-Virus.
> Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/05
>
>

--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/05

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Stewart Baker

RE: K2 - NOISY POLLING

In reply to this post by Don Wilhelm-3

I guess that my setup is just plain awkward. I had a lot of computer noise until
I connected the shield end at the computer as well as the K2 end.
Can't explain why it worked, but it did...not a peep now. Worth a try.

73
Stewart G3RXQ

On Thu, 17 Feb 2005 09:03:22 -0500, W3FPR - Don Wilhelm wrote:

> Chris,
>
> Just a wild guess, but you may want to check the cable between the K2 and
> the computer - make certain the cable shield is connected at the K2 end and
> is NOT connected at the computer end - if the shield is connected at both
> ends, you can get some induced currents on the cable, but I don't know how
> it might be coupled into the K2 audio.
>
> 73,
> Don W3FPR
>
>> -----Original Message-----
>>
>>
>> Does anyone else have a problem with noisy polling with their K2 when
>> used with a computer logging program, and is there a cure for it?
>>
>> I have two K2/100s which both have the 160m, NB and DSP options and
>> one has the SSB option. I am using N1MM Logger with an old desk-top
>> (about 300MHz) computer under Windows 98 and when I listen to the SSB
>> K2 on any band with the AF gain at minimum, I can hear a soft pulse
>> every second or so. This does not increase as the AF Gain is
>> advanced and normally the sound of signals, etc masks it, but it is
>> slightly annoying when tuning on a very quiet band.
>>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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> Elecraft web page: http://www.elecraft.com

Rich Lentz

RE: K2 - NOISY POLLING

In reply to this post by G4BUE

My radio was unusable until I added an isolation transformer between the
mike input and audio output (1 each). Just used junk box transformers with
no idea of the input/output impedance. The PC Sound card is very high
impedance so no need to assume you need to have a 1:1 or 20K to 4 ohm,
picked for their size (SMALL ) Signal level was such that I had to add a
100K/1K divider feeding the Sound card. Got rid of all noise except the
noise from the oscillators in the PC and monitor. Since you end up adding
the CAT-IO interface it is kind of hard to eliminate any ground return (and
associated ground-loop) unless you also add an optical isolator.

Rich,
KE0X

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hank k8dd-2

Re: K2 - NOISY POLLING

In reply to this post by Stewart Baker

I got rid of the computer polling noise on both of my K2/100's by
removing the right side panel and tucking the ribbon cable up as
high as possible - away from the main board.

Not that I would recommend doing it the way that I did it (with
the power on and CTWin up and running), but I could hear the
polling noise go away on each radio as I tucked the ribbon cable
up as close to the top cover as I could get it.

Again I would not recommend that you do it with power on unless
you like living on the dangerous edge of life .... in the K2 lane!!

73 Hank K8DD

Stewart Baker wrote:

>I guess that my setup is just plain awkward. I had a lot of computer noise until
>I connected the shield end at the computer as well as the K2 end.
>Can't explain why it worked, but it did...not a peep now. Worth a try.
>
>73
>Stewart G3RXQ
>
>On Thu, 17 Feb 2005 09:03:22 -0500, W3FPR - Don Wilhelm wrote:
>
>
>>Chris,
>>
>>Just a wild guess, but you may want to check the cable between the K2 and
>>the computer - make certain the cable shield is connected at the K2 end and
>>is NOT connected at the computer end - if the shield is connected at both
>>ends, you can get some induced currents on the cable, but I don't know how
>>it might be coupled into the K2 audio.
>>
>>73,
>>Don W3FPR
>>
>>
>>
>>>-----Original Message-----
>>>
>>>
>>>Does anyone else have a problem with noisy polling with their K2 when
>>>used with a computer logging program, and is there a cure for it?
>>>
>>>I have two K2/100s which both have the 160m, NB and DSP options and
>>>one has the SSB option. I am using N1MM Logger with an old desk-top
>>>(about 300MHz) computer under Windows 98 and when I listen to the SSB
>>>K2 on any band with the AF gain at minimum, I can hear a soft pulse
>>>every second or so. This does not increase as the AF Gain is
>>>advanced and normally the sound of signals, etc masks it, but it is
>>>slightly annoying when tuning on a very quiet band.
>>>
>>>
>>>

--

'Never argue with an idiot. They drag you down to their
level then beat you with experience.' -anon

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Lou Roux-2

Re: K2 - NOISY POLLING

Hank and all,

I've had the same polling noise and the S meter would flicker with each
poll when using any logging program, not loud but still there. Now, you
suggestion worked like a champ, just tucked the ribbon up out of the way
and no more nothing! I wonder if there's a more elegant fix like
sheilding of some sort.

Thanks a bunch,

Lou - W6UR

Hank Kohl K8DD wrote:

> I got rid of the computer polling noise on both of my K2/100's by
> removing the right side panel and tucking the ribbon cable up as
> high as possible - away from the main board.
>
> Not that I would recommend doing it the way that I did it (with
> the power on and CTWin up and running), but I could hear the
> polling noise go away on each radio as I tucked the ribbon cable
> up as close to the top cover as I could get it.
> Again I would not recommend that you do it with power on unless
> you like living on the dangerous edge of life .... in the K2 lane!!
>
> 73 Hank K8DD
>

--
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Checked by AVG Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/2005

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Don Wilhelm-3

RE: K2 - NOISY POLLING

What could be more elegant than a neatly folded cable? <G>

This discussion does re-inforce my opinion that anytime the KPA100 is
installed, the right side panel be removed so the cables can be dressed
properly and not interfere with the shield plate or the clips. It is also
easier to remove/replace the KPA100 option if the left side panel is
loosened to remove some of the pressure on the shield clip - failure to do
that can bend the clips.

73,
Don W3FPR

> -----Original Message-----
>
> I've had the same polling noise and the S meter would flicker with each
> poll when using any logging program, not loud but still there. Now, you
> suggestion worked like a champ, just tucked the ribbon up out of the way
> and no more nothing! I wonder if there's a more elegant fix like
> sheilding of some sort.
>
> Thanks a bunch,
>
> Lou - W6UR
>
>
>
> Hank Kohl K8DD wrote:
>
> > I got rid of the computer polling noise on both of my K2/100's by
> > removing the right side panel and tucking the ribbon cable up as
> > high as possible - away from the main board.
> >
> > Not that I would recommend doing it the way that I did it (with
> > the power on and CTWin up and running), but I could hear the
> > polling noise go away on each radio as I tucked the ribbon cable
> > up as close to the top cover as I could get it.
> > Again I would not recommend that you do it with power on unless
> > you like living on the dangerous edge of life .... in the K2 lane!!
> >
> > 73 Hank K8DD
> >
>
>
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/2005
>
>

hank k8dd-2

Re: K2 - NOISY POLLING - neat vs. elegant

In reply to this post by Lou Roux-2

Lou Roux wrote:

> Hank and all,
>
> I've had the same polling noise and the S meter would flicker with
> each poll when using any logging program, not loud but still there.
> Now, you suggestion worked like a champ, just tucked the ribbon up out
> of the way and no more nothing! I wonder if there's a more elegant fix
> like sheilding of some sort.

Tucked up ------------------------------ neat fix
Neatly folded and tucked up ----- elegant fix

I looked at it for a day, but short of using a shielded cable, which
seemed like a lot of work when the fold & tuck solved the problem ....
so I got on 20M and worked some DX!

72 73 Hank K8DD

--

'Never argue with an idiot. They drag you down to their
level then beat you with experience.' -anon

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