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K3: Strong Signals in passband

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NK7Z

K3: Strong Signals in passband

Hello,
I have a few friends who live close by. When they operate, digital, and
while the K3 is in DIGITAL A mode, I see what looks like random white
noise across the audio passband of the K3 audio waterfall, (not on the
P3 at all), when viewing with any digital program. I have been
attempting to characterize this a bit more prior to asking questions so
here is what I see:

1. Any strong digital audio signal, causes this issue.
2. Looking at the P3, I see no ill affects.
3. The K3 is feeding my computer's sound card.
4. The same setup only using an Icom 756 PRO III did not do this.
5. I am feeding the sound card from the rear audio jack.
6. I have watched loud signals drift louder, and had the problem start,
while I was looking at it. There is an avalanche effect.
7. Turning down the RF gain control, which reduces audio, reduces the
issue.

Any suggestions to help this go away, or at least behave as the PRO III
did? I am pretty sure this is an audio issue, not an RF issue...
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
for MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info

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Don Wilhelm-4

Re: K3: Strong Signals in passband

David,

Try reducing the Line Out level on the K3 to see if that makes a
difference. At one time there was a recommendation that the Line Out
level should not exceed 10 to minimize distortion.
You may have to increase the LINE IN setting on your computer to compensate.

73,
Don W3FPR

On 8/6/2014 8:55 AM, David Cole wrote:

> Hello,
> I have a few friends who live close by. When they operate, digital, and
> while the K3 is in DIGITAL A mode, I see what looks like random white
> noise across the audio passband of the K3 audio waterfall, (not on the
> P3 at all), when viewing with any digital program. I have been
> attempting to characterize this a bit more prior to asking questions so
> here is what I see:
>
> 1. Any strong digital audio signal, causes this issue.
> 2. Looking at the P3, I see no ill affects.
> 3. The K3 is feeding my computer's sound card.
> 4. The same setup only using an Icom 756 PRO III did not do this.
> 5. I am feeding the sound card from the rear audio jack.
> 6. I have watched loud signals drift louder, and had the problem start,
> while I was looking at it. There is an avalanche effect.
> 7. Turning down the RF gain control, which reduces audio, reduces the
> issue.
>
>

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NK7Z

Re: K3: Strong Signals in passband

Don,
Thanks, not sure why I did not think of that, I am just not fully aware
of all the options this radio has... Done! I will let you know!

--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
for MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info

On Wed, 2014-08-06 at 09:06 -0400, Don Wilhelm wrote:

> David,
>
> Try reducing the Line Out level on the K3 to see if that makes a
> difference. At one time there was a recommendation that the Line Out
> level should not exceed 10 to minimize distortion.
> You may have to increase the LINE IN setting on your computer to compensate.
>
> 73,
> Don W3FPR
>
> On 8/6/2014 8:55 AM, David Cole wrote:
> > Hello,
> > I have a few friends who live close by. When they operate, digital, and
> > while the K3 is in DIGITAL A mode, I see what looks like random white
> > noise across the audio passband of the K3 audio waterfall, (not on the
> > P3 at all), when viewing with any digital program. I have been
> > attempting to characterize this a bit more prior to asking questions so
> > here is what I see:
> >
> > 1. Any strong digital audio signal, causes this issue.
> > 2. Looking at the P3, I see no ill affects.
> > 3. The K3 is feeding my computer's sound card.
> > 4. The same setup only using an Icom 756 PRO III did not do this.
> > 5. I am feeding the sound card from the rear audio jack.
> > 6. I have watched loud signals drift louder, and had the problem start,
> > while I was looking at it. There is an avalanche effect.
> > 7. Turning down the RF gain control, which reduces audio, reduces the
> > issue.
> >
> >
>