K3 Background noise

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K3 Background noise

JayR
I have a problem with noise in the shack.
On transmit it is picked up by the mic. Other than lowering the RF gain I understand that
there is a setting which could reduce or eliminate this
some where in the config.  Any tgoughts would be appreciated.

Thanks
Jay
Jay Rodaman
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Re: K3 Background noise

Don Wilhelm-4
Jay,

Other than using a noise canceling microphone, I don't know how to
battle local noise in the shack.

73,
Don W3FPR

Jay Rodaman wrote:

> I have a problem with noise in the shack.
> On transmit it is picked up by the mic. Other than lowering the RF gain I understand that
> there is a setting which could reduce or eliminate this
> some where in the config.  Any tgoughts would be appreciated.
>
> Thanks
> Jay
> Jay Rodaman
>  
>
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Re: K3 Background noise

Bruce Beford-2
In reply to this post by JayR
Jay,

I believe you are looking for the Noise Gate function. The latest version of
the Owner's Manual has info under Config:TX Gate. Haven't played with it
myself, as I have a fairly quit shack.

GL,
Bruce N1RX


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Re: K3 Background noise

Bruce Beford-2
In reply to this post by JayR
That is, I have a fairly QUIET shack... Not quit. Fast fingers got me
again..

GL,
Bruce N1RX


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Re: K3 Background noise

Don Nesbitt
In reply to this post by Bruce Beford-2
TX Gate was first added last September 2008 in MCU 2.45 according to my
notes.  Config => TX GATE => Tap "1" (A/B) to turn On or Off => use Vfo B to
set level.  Level can be set in Test mode while listening with headphones to
the Monitor.

I use it all the time with my level set to 12 and it works extremely well at
eliminating a lot of shack noise from going out over the air.  Very useful!
73 -- Don N4HH  K3/100 #83

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Bruce Beford
Sent: Sunday, May 24, 2009 10:50 AM
To: [hidden email]
Subject: Re: [Elecraft] K3 Background noise

Jay,

I believe you are looking for the Noise Gate function. The latest version of
the Owner's Manual has info under Config:TX Gate. Haven't played with it
myself, as I have a fairly quit shack.

GL,
Bruce N1RX


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Re: K3 Background noise

Jim-168
In reply to this post by Bruce Beford-2
I use the noise gate feature because I have a dehumidifier in my basement
close to the operating position and I have asked....no one has noticed the
loud fan when it kicks on.

Config:TX Gate On 15

73 de KE4WY Jim

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Bruce Beford
Sent: Sunday, May 24, 2009 10:50 AM
To: [hidden email]
Subject: Re: [Elecraft] K3 Background noise

Jay,

I believe you are looking for the Noise Gate function. The latest version of
the Owner's Manual has info under Config:TX Gate. Haven't played with it
myself, as I have a fairly quit shack.

GL,
Bruce N1RX


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Re: K3 Background noise

AC7AC
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Re: K3 Background noise

Giulio Pico - IW3HVB
I had the same problem, with a quite noisy shack, the 8877 I use on 144
MHz have a pretty big fan, plus I have other fans on the PC, on the
Network rack and so on.
I solved the problem using a carefully selected microphone.
I chose a SM-57 instrument pickup microphone, from Shure.
The choice followed this criteria:
1) Cardioid (highly directive) pattern, with low sidelobes.
2) Dynamic microphone, with a low sensitivity.
3) Almost flat audio response, with limited bass roll-off.

I keep the TX equalizer completely flat, and I set the mic gain at level 20.
A little bit of compression can give you the right punch, without
affecting readability, let's say 10.
These settings work well for me, but keep in mind to set the Mic Gain
looking at an external wattmeter: remaining on Tx, and not talking, you
shoudn't see any power going out.

Good luck!

73 de Giulio IW3HVB


>
> I have a problem with noise in the shack.
> On transmit it is picked up by the mic. Other than lowering the RF gain I
> understand that
> there is a setting which could reduce or eliminate this
> some where in the config.  Any tgoughts would be appreciated.
>
> Thanks
> Jay
> Jay Rodaman
>
>  
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Re: K3 Background noise

Jim Brown-10
In reply to this post by Don Wilhelm-4
On Sun, 24 May 2009 10:38:12 -0400, Don Wilhelm wrote:

>Other than using a noise canceling microphone, I don't know how to
>battle local noise in the shack.

See

http://audiosystemsgroup.com/HamInterfacing.pdf 

for detailed advice on choosing mics to minimize noise pickup, and
suitable TXEQ settings.  Once you've done that, if you still have
noise, the K3 has a DSP setting that acts as a TX noise gate. Study
the doc files for the later versions of K3 software.

73,

Jim Brown K9YC


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Re: K3 Background noise

Bjorn
In reply to this post by JayR
On 24 maj 2009, at 15.55, Jay Rodaman wrote:

> I have a problem with noise in the shack.
> On transmit it is picked up by the mic. Other than lowering the RF  
> gain I understand that
> there is a setting which could reduce or eliminate this
> some where in the config.  Any tgoughts would be appreciated.

There's a noise gate in the K3 that will mute between words. Its easy  
to configure and fast enough for speech. It's will make sure your  
background noise is not amplified and processed between words. As  
other pointed out, a close talk microphone like the Heil HC4 or HC-5  
will help a lot. I am running the HC-4 + compression + gate and have  
no problem with my rather loud amplifier fans.

 From Wayne's FW release notes:

MCU 2.45 / DSP 1.92, 9-29-2008 * TRANSMIT NOISE GATE ADDED: The TX  
noise gate can be used to suppress transmitted audio below a certain  
level, e.g. a noisy fan (not the one on the K3, of course). To use the  
noise gate, locate CONFIG:TX GATE, tap ‘1’ to turn it ON, then use VFO  
A to set the desired threshold. Since there’s no visual indication  
that transmit audio is below the threshold, you should adjust it using  
the transmit voice monitor (MON), ideally using headphones. Set the  
threshold high enough to cut off transmit audio due to shack noise,  
but not so high that it causes your voice to dropout too frequently.  
The TX GATE threshold can be adjusted in TX TEST mode.

73 de Björn,
SM0MDG
SE0X





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