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K3 MON feedback question

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K5WA

K3 MON feedback question

I thought I knew my K3s pretty well but I've got a simple issue that I can't
seem to figure out so I thought I would toss it out to the crowd to see if
you can clear my fog. There must be a simple setting that I've set
incorrectly. I don't get on SSB very often but I'm trying to get ready for
CQWW SSB soon and needed to go through this process of setting up the PC
sound card for sending recorded messages.

Problem: I can't use the MON on SSB because I get feedback (not the
squealing type but the RF garbled sounding type) into my transmitted signal.
When MON is set to zero, everything transmits perfectly, but, of course, I
can't monitor my audio.

Setup: Pair of K3s in SO2R with homebrew SO2R switching box. (The problem
occurs with or without the SO2R box installed.) I use LINE IN for my
recorded messages and my MIC is attached to the rear MIC input. My
headphones are connected to the rear PHONES jack via the SO2R box. Sound
card is the internal PC sound card of a DELL XP machine. MIC+LIN = ON. FW
4.06. KDVR3 installed but not used for contests. KRX3 installed but not
involved in this problem (I don't think).

It seems as if my headset microphone is picking up audio from the MON and
dumping it into the MIC line, however, the speakers are OFF and I'm only
using headphones. Since it can't be the speakers, I'm thinking I've got an
open path between the MON and the MIC input but I'm not sure where that
could be...inside the K3, on the PC sound card, etc.?

I'm hoping to hear a simple "Did you set your so-and-so to OFF?" suggestion
that will trigger an Ah-ha moment for me. I know it isn't a "pin 1" problem
because that went away when my microHAM MK2R box got hit by lightning last
month. ;-) Maybe my sound card is hearing the MON and dumping it back
into the MIC inside the PC? I'm not sure whether the sound card is full
duplex or not. Any suggestions would be appreciated because I'm stumped and
would appreciate a new set of eyes on this issue.

Thanks,

Bob K5WA

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Iain MacDonnell - N6ML-2

Re: K3 MON feedback question

Bob,

Assuming Windows XP (adjust as necessary for others) ...

Control Panel -> Sounds and Audio Devices -> Audio

Under "Sound playback", click on "Volume..."

Options -> Properties

Check that the appropriate "Mixer device" is selected, and that the
"Line In" or "Line Volume" control is enabled. Click "OK".

Find the "Line In" or "Line Volume" control and check the "Mute" box below it.

That should prevent the monitor audio from looping back out to the rig.

~Iain / N6ML

On Mon, Oct 18, 2010 at 4:20 PM, K5WA <[hidden email]> wrote:

> I thought I knew my K3s pretty well but I've got a simple issue that I can't
> seem to figure out so I thought I would toss it out to the crowd to see if
> you can clear my fog. There must be a simple setting that I've set
> incorrectly. I don't get on SSB very often but I'm trying to get ready for
> CQWW SSB soon and needed to go through this process of setting up the PC
> sound card for sending recorded messages.
>
>
>
> Problem: I can't use the MON on SSB because I get feedback (not the
> squealing type but the RF garbled sounding type) into my transmitted signal.
> When MON is set to zero, everything transmits perfectly, but, of course, I
> can't monitor my audio.
>
>
>
> Setup: Pair of K3s in SO2R with homebrew SO2R switching box. (The problem
> occurs with or without the SO2R box installed.) I use LINE IN for my
> recorded messages and my MIC is attached to the rear MIC input. My
> headphones are connected to the rear PHONES jack via the SO2R box. Sound
> card is the internal PC sound card of a DELL XP machine. MIC+LIN = ON. FW
> 4.06. KDVR3 installed but not used for contests. KRX3 installed but not
> involved in this problem (I don't think).
>
>
>
> It seems as if my headset microphone is picking up audio from the MON and
> dumping it into the MIC line, however, the speakers are OFF and I'm only
> using headphones. Since it can't be the speakers, I'm thinking I've got an
> open path between the MON and the MIC input but I'm not sure where that
> could be...inside the K3, on the PC sound card, etc.?
>
>
>
> I'm hoping to hear a simple "Did you set your so-and-so to OFF?" suggestion
> that will trigger an Ah-ha moment for me. I know it isn't a "pin 1" problem
> because that went away when my microHAM MK2R box got hit by lightning last
> month. ;-) Maybe my sound card is hearing the MON and dumping it back
> into the MIC inside the PC? I'm not sure whether the sound card is full
> duplex or not. Any suggestions would be appreciated because I'm stumped and
> would appreciate a new set of eyes on this issue.
>
>
>
> Thanks,
>
> Bob K5WA
>
> ______________________________________________________________
> 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
>

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K5WA

Re: K3 MON feedback question

Iain,

I think you win the prize because that would explain everything I'm seeing.
When I run out to the station this weekend, I'll give it a try. I
appreciate you setting off my Ah-ha alarm and clearing my fog. ;-)

Thanks,

Bob K5WA

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Iain
MacDonnell - N6ML
Sent: Monday, October 18, 2010 1:20 PM
To: K5WA
Cc: Elecraft reflector
Subject: Re: [Elecraft] K3 MON feedback question

Bob,

Assuming Windows XP (adjust as necessary for others) ...

Control Panel -> Sounds and Audio Devices -> Audio

Under "Sound playback", click on "Volume..."

Options -> Properties

Check that the appropriate "Mixer device" is selected, and that the
"Line In" or "Line Volume" control is enabled. Click "OK".

Find the "Line In" or "Line Volume" control and check the "Mute" box below
it.

That should prevent the monitor audio from looping back out to the rig.

~Iain / N6ML

On Mon, Oct 18, 2010 at 4:20 PM, K5WA <[hidden email]> wrote:
> I thought I knew my K3s pretty well but I've got a simple issue that I
can't
> seem to figure out so I thought I would toss it out to the crowd to see if
> you can clear my fog. There must be a simple setting that I've set
> incorrectly. I don't get on SSB very often but I'm trying to get ready
for
> CQWW SSB soon and needed to go through this process of setting up the PC
> sound card for sending recorded messages.
>
>
>
> Problem: I can't use the MON on SSB because I get feedback (not the
> squealing type but the RF garbled sounding type) into my transmitted
signal.

> When MON is set to zero, everything transmits perfectly, but, of course, I
> can't monitor my audio.
>
>
>
> Setup: Pair of K3s in SO2R with homebrew SO2R switching box. (The problem
> occurs with or without the SO2R box installed.) I use LINE IN for my
> recorded messages and my MIC is attached to the rear MIC input. My
> headphones are connected to the rear PHONES jack via the SO2R box. Sound
> card is the internal PC sound card of a DELL XP machine. MIC+LIN = ON. FW
> 4.06. KDVR3 installed but not used for contests. KRX3 installed but not
> involved in this problem (I don't think).
>
>
>
> It seems as if my headset microphone is picking up audio from the MON and
> dumping it into the MIC line, however, the speakers are OFF and I'm only
> using headphones. Since it can't be the speakers, I'm thinking I've got

an
> open path between the MON and the MIC input but I'm not sure where that
> could be...inside the K3, on the PC sound card, etc.?
>
>
>
> I'm hoping to hear a simple "Did you set your so-and-so to OFF?"
suggestion
> that will trigger an Ah-ha moment for me. I know it isn't a "pin 1"
problem
> because that went away when my microHAM MK2R box got hit by lightning last
> month. ;-) Maybe my sound card is hearing the MON and dumping it back
> into the MIC inside the PC? I'm not sure whether the sound card is full
> duplex or not. Any suggestions would be appreciated because I'm stumped
and

> would appreciate a new set of eyes on this issue.
>
>
>
> Thanks,
>
> Bob K5WA
>
> ______________________________________________________________
> 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
>

Irwin KD3TB

K3 MON feedback question

In reply to this post by K5WA

I found a similar problem and would like to add my "2 cents" for a future
firmware update.

Currently the Mic+Lin (Menu) setting is either on or off. I would like to
see an additional option that mutes the Lin In audio, when audio is picked
up on the Mic Input. This would prevent audio feedback from getting into the
TX signal (and Monitor audio)from the Lin-In when using the Mic to transmit.
To date, no one has said that this "noise audio" is being transmitted on my
signal. I do find that when recording a message in the K3 DVK, the audio
from Lin In will bleed over into the recorded message.

Thanks, Irwin KD3TB

______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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