feedback in K3

[Scott Dunlavey]

Hello agn... I cant figure what I have set wrong...  I have set up the
eq on the K3 in transmit the following way...  1=+12  2=+10  3=-1   4=
-1   5= 0  6= -1  7=0  8 = +2  Rx is the same....  (this is how I had it
set for the w2ihy EQ...)    as I am trying to set the mic gain and
monitor levels  I get a lot of feedback in my headphone.very loud..  My
monitor level is very low... compression has NOT been adjusted because
of the feedback so that is at zero....  I have a heil pro20 running to
the front of the K3... any ideas


scott
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[Vic Rosenthal]

Make sure you do NOT have SP + PH set. If you do, the speaker and phones will both be on.
The speaker must be off to avoid feedback if the monitor is on.

On 8/14/2012 7:54 PM, Scott Dunlavey wrote:

> Hello agn... I cant figure what I have set wrong...  I have set up the
> eq on the K3 in transmit the following way...  1=+12  2=+10  3=-1   4=
> -1   5= 0  6= -1  7=0  8 = +2  Rx is the same....  (this is how I had it
> set for the w2ihy EQ...)    as I am trying to set the mic gain and
> monitor levels  I get a lot of feedback in my headphone.very loud..  My
> monitor level is very low... compression has NOT been adjusted because
> of the feedback so that is at zero....  I have a heil pro20 running to
> the front of the K3... any ideas
>
>
> scott

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[Joe Subich, W4TV-4]

> I have set up the eq on the K3 in transmit the following way... 1=+12
> 2=+10 3=-1 4= -1 5= 0 6= -1 7=0 8 = +2

Boost at the low frequencies is not only wasteful of transmit power, it
will almost certainly guarantee feedback due to the closeness of the
headphones and microphone.  Since there is no audio power in the 50 Hz
range, set band 1 to -6 or less and band 2 to no more than +3.  I would
also move the "articulation peak" (high frequency) down to band 7 where
it will do some good.

Get rid of the absurd amount of low frequency "boost" - your feedback
problems will go away and your audio will sound better.

73,

    ... Joe, W4TV


On 8/14/2012 10:54 PM, Scott Dunlavey wrote:

> Hello agn... I cant figure what I have set wrong...  I have set up the
> eq on the K3 in transmit the following way...  1=+12  2=+10  3=-1   4=
> -1   5= 0  6= -1  7=0  8 = +2  Rx is the same....  (this is how I had it
> set for the w2ihy EQ...)    as I am trying to set the mic gain and
> monitor levels  I get a lot of feedback in my headphone.very loud..  My
> monitor level is very low... compression has NOT been adjusted because
> of the feedback so that is at zero....  I have a heil pro20 running to
> the front of the K3... any ideas
>
>
> scott
> ______________________________________________________________
> 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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[N5GE-2]

Having the 1 setting so low will also make your signal mushy and hard to
understand.  Remember, commercial broadcast quality will widen your signal and
make it difficult to understand in conditions where the atmospheric noise level
is above normal.

Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member

On Tue, 14 Aug 2012 22:54:46 -0400 (EDT), Scott Dunlavey <[hidden email]>
wrote:

>Hello agn... I cant figure what I have set wrong...  I have set up the
>eq on the K3 in transmit the following way...  1=+12  2=+10  3=-1   4=
>-1   5= 0  6= -1  7=0  8 = +2  Rx is the same....  (this is how I had it
>set for the w2ihy EQ...)    as I am trying to set the mic gain and
>monitor levels  I get a lot of feedback in my headphone.very loud..  My
>monitor level is very low... compression has NOT been adjusted because
>of the feedback so that is at zero....  I have a heil pro20 running to
>the front of the K3... any ideas
>
>
>scott
>______________________________________________________________
>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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[Jim Brown-10]

On 8/14/2012 8:28 PM, Joe Subich, W4TV wrote:
> Boost at the low frequencies is not only wasteful of transmit power,

Right on, Joe.  There is NO good reason to transmit ANYTHING below 200
Hz from a ham station, simply because human speech contains no energy
below about 125 Hz, and frequencies below about 350 Hz contribute
nothing at all to speech intelligibility.  The only good contribution
made by speech sounds below 500 Hz is to add some "body" to the voice.  
Since the beginnings of telephony, bandwidth has been intentionally
limited to the range of 500-3,000 Hz, because that's what makes the
greatest contribution to intelligibility.

In general, EVERY ham transmitter should attempt to cut off everything
below about 250 Hz, which is the basis of my recommendation for setting
the bottom two TXEQ bands for maximum cut, doing substantial cutting of
the third band, and running everything else flat (0 dB).

BTW -- another VERY important reason for killing wasted power below
about 250 Hz is that there's a lot of room noise, breathe pops, hum, and
buzz down there.

Nearly all "ham" mics, as well as most boom mic headsets designed for
use with computers, provide a peaky boost around 3 kHz to compensate for
the rolloff of the filters in telephone systems and ham transmitters.  
With these mics, there is no need for any boost EQ at all.  This
includes mics like the CM500 and the Heil mics.

Mics intended for recording, sound reinforcement, and broadcast don't
have that peaky boost built in, so TXEQ needs to supply it. For those
mics ONLY, a good starting point is about +8dB in the highest band and
perhaps +3dB in the next highest band.

73, Jim K9YC
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[Bill W]

You can get the recommend K3 mic or headset settings for all Heil products off the Heil Website.
Bill - W0BBI