[K3} Mic gain/noise on xmit

[Mike Reublin]

  This afternoon, chatting with a couple of locals on 6M, they mentioned I had some
noise on my signal. One said it sounded like a radio in the background, the other
characterized it as a loud hiss, with some intermittent high pitched blurbs.

I disconnected the computer(RS232 & audio IO) and external speakers, and the noise
was still there. I turned on the monitor and could hear it.

I'm using a Yamaha CM500 connected to the back panel. One of the guys was using a K3,
and he commented that he was using the Elecraft hand mic, and his mic gain was set at
30. Mine was set at 9, which gave me 8/9 bars on the ALC meter(ooooops). A gain
setting of 1 gives me the desired 5 bars. Now the monitor sounds like mild
atmospheric noise, with a slight static burst every now and then.

Is the CM500 that hot? Where else could the noise be coming from? Does the monitor
pick up from received signals, or just the mic?

73, Mike NF4L
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[KK7P]

> Is the CM500 that hot? Where else could the noise be coming from? Does the monitor
> pick up from received signals, or just the mic?

MON is just Tx.  For my CM500 I have RP.L BIAS for mic setting, gain is
10.  FOr my voice, CMP14 is about right.

73,

Lyle KK7P
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[Don Wilhelm-4]

Mike,

That sounds like you have your MIC SEL menu set for "H" - try tapping
the "1" button to change it to "L" so you can set your mic gain higher
(and gives you more range).  I don't know if it will help your noise,
but it would explain the difference between your setting of 9 and the
other fellow's 30.  BTW, mine is set at 38 for the Elecraft MD2.

73,
Don W3FPR

Mike wrote:

>   This afternoon, chatting with a couple of locals on 6M, they mentioned I had some
> noise on my signal. One said it sounded like a radio in the background, the other
> characterized it as a loud hiss, with some intermittent high pitched blurbs.
>
> I disconnected the computer(RS232 & audio IO) and external speakers, and the noise
> was still there. I turned on the monitor and could hear it.
>
> I'm using a Yamaha CM500 connected to the back panel. One of the guys was using a K3,
> and he commented that he was using the Elecraft hand mic, and his mic gain was set at
> 30. Mine was set at 9, which gave me 8/9 bars on the ALC meter(ooooops). A gain
> setting of 1 gives me the desired 5 bars. Now the monitor sounds like mild
> atmospheric noise, with a slight static burst every now and then.
>
> Is the CM500 that hot? Where else could the noise be coming from? Does the monitor
> pick up from received signals, or just the mic?
>
>
>  

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[Gary Gregory]

Don and all,

I also use the CM-500 and run Bias L

Mic @ 19
Comp @ 15

I do have a soft voice and do speak softly as well as I am in a quiet
operating position. (Under the awning of my Motorhome) until the Cockatoos
start to scream.

Gary

On Thu, Aug 5, 2010 at 8:57 AM, Don Wilhelm <[hidden email]> wrote:

> Mike,
>
> That sounds like you have your MIC SEL menu set for "H" - try tapping
> the "1" button to change it to "L" so you can set your mic gain higher
> (and gives you more range).  I don't know if it will help your noise,
> but it would explain the difference between your setting of 9 and the
> other fellow's 30.  BTW, mine is set at 38 for the Elecraft MD2.
>
> 73,
> Don W3FPR
>
> Mike wrote:
> >   This afternoon, chatting with a couple of locals on 6M, they mentioned
> I had some
> > noise on my signal. One said it sounded like a radio in the background,
> the other
> > characterized it as a loud hiss, with some intermittent high pitched
> blurbs.
> >
> > I disconnected the computer(RS232 & audio IO) and external speakers, and
> the noise
> > was still there. I turned on the monitor and could hear it.
> >
> > I'm using a Yamaha CM500 connected to the back panel. One of the guys was
> using a K3,
> > and he commented that he was using the Elecraft hand mic, and his mic
> gain was set at
> > 30. Mine was set at 9, which gave me 8/9 bars on the ALC meter(ooooops).
> A gain
> > setting of 1 gives me the desired 5 bars. Now the monitor sounds like
> mild
> > atmospheric noise, with a slight static burst every now and then.
> >
> > Is the CM500 that hot? Where else could the noise be coming from? Does
> the monitor
> > pick up from received signals, or just the mic?
> >
> >
> >
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>

--
Gary
VK4FD - Motorhome Mobile
http://www.qsl.net/vk4fd/
K3 #679
For everything else there's Mastercard!!!
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[Mike Reublin]

  Thanks Lyle, Don and Gary.

I did have MIC SEL set to high. I set it to L and with the mic gain at 10, I get the
correct bars. I'll check later when I can get one of the critical locals on to see if
that fixed the XMIT noise, which is what I really want to solve.

Mike

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[Jim Brown-10]

On Wed, 04 Aug 2010 15:54:42 -0700, Lyle Johnson wrote:


>MON is just Tx.  For my CM500 I have RP.L BIAS for mic setting, gain is
>10.  FOr my voice, CMP14 is about right.

The CM500 IS hot. I've never noticed, or had complaints, of any background
noise. I also run it into the rear panel. Make sure to set the mic gain range
to low.

73, Jim K9YC



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[Mike Reublin]

  I wasn't sure the mic was the source of the noise, but after setting it to L, on
air trial indicates that the issue is fully resolved.

Thanks again.

Mike

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