Elecraft

Sidetone volume

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Fred Bennett N9TA

Sidetone volume

Hi Gang

My wife often invades my shack to watch TV while my son plays Xbox on the TV
in the living room. I plug in my headphones while she is watching TV so that
the noise won't bother her...(and the noise from the TV won't bother
ME)...But when she's gone I unplug the headphones and use an external
speaker. I have noticed a VAST difference in the sidetone volume between
headphones and speaker. I must turn DOWN the volume a BUNCH when using the
headphones....but then when using the external speaker the sidetone is
almost completely silent. I adjust the volume for comfortable listening
levels with both the headphones and the speaker...but the sidetone volume
seems to change between the two.

Is there a cure for the difference in sidetone levels??

73...de...Fred N9TA

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Don Wilhelm-3

RE: Sidetone volume

Fred,

Since you are reducing the setting of the AF gain control when changing from
headphones to the speaker? If so, that is the reason in a 'nutshell' - the
level of the sidetone is not controlled by the AF gain.

So, if you set the sidetone level to be correct for your speaker volume,
then it will be too loud when you reduce the AF Gain for use with the
headphones.

I would suggest that you try increasing the value of R35 and R36 on the K2
RF Board so you do not have to reduce the AF Gain as much when using the
headphones - or switch to a less sensitive set of headphones.

You can also just change the sidetone level in the menu (assigned by default
to the PF1 button) when switching from speaker to headphones.

73,
Don W3FPR

> -----Original Message-----
>
> My wife often invades my shack to watch TV while my son plays
> Xbox on the TV
> in the living room. I plug in my headphones while she is watching
> TV so that
> the noise won't bother her...(and the noise from the TV won't bother
> ME)...But when she's gone I unplug the headphones and use an external
> speaker. I have noticed a VAST difference in the sidetone volume between
> headphones and speaker. I must turn DOWN the volume a BUNCH when using the
> headphones....but then when using the external speaker the sidetone is
> almost completely silent. I adjust the volume for comfortable listening
> levels with both the headphones and the speaker...but the sidetone volume
> seems to change between the two.
>
> Is there a cure for the difference in sidetone levels??
>
> 73...de...Fred N9TA
>

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Fred Bennett N9TA

RE: Sidetone volume

Tnx Don

I think you may have hit the nail on the head. I DO have to reduce the
volume greatly when using the headphones. From my perusal of the schematic
for the K2, it looks like if I changed R36 it would change the AF level on
both the speaker AND the phones...NOT what I *think* I want. It looks like
R35 (a 82 ohm resister) is in line with the AF feed for the phones. Does
this look right??
On Phones I use a sidetone level of 25...on speaker I use a sidetone level
of 140....is it possible to deduce from this what a good value of resister
would be for R35??

TNX for the help!! 73...de...Fred N9TA
___________________________________________________________________________
Fred,

Since you are reducing the setting of the AF gain control when changing from
headphones to the speaker? If so, that is the reason in a 'nutshell' - the
level of the sidetone is not controlled by the AF gain.

So, if you set the sidetone level to be correct for your speaker volume,
then it will be too loud when you reduce the AF Gain for use with the
headphones.

I would suggest that you try increasing the value of R35 and R36 on the K2
RF Board so you do not have to reduce the AF Gain as much when using the
headphones - or switch to a less sensitive set of headphones.

You can also just change the sidetone level in the menu (assigned by default
to the PF1 button) when switching from speaker to headphones.

73,
Don W3FPR

Don Wilhelm-3

RE: Sidetone volume

Fred,

R35 and R36 are only in series with the headphones, not the speaker (follow
the audio amp output through the switch on the headphone jack to verify).

You will have to experiment with the required value - I do not have voltage
levels corresponding to the numbers of STL, nor do I have the SPL rating for
your headphones.

73,
Don W3FPR

> -----Original Message-----
>
> Tnx Don
>
> I think you may have hit the nail on the head. I DO have to reduce the
> volume greatly when using the headphones. From my perusal of the schematic
> for the K2, it looks like if I changed R36 it would change the AF level on
> both the speaker AND the phones...NOT what I *think* I want. It looks like
> R35 (a 82 ohm resister) is in line with the AF feed for the phones. Does
> this look right??
> On Phones I use a sidetone level of 25...on speaker I use a sidetone level
> of 140....is it possible to deduce from this what a good value of resister
> would be for R35??
>
> TNX for the help!! 73...de...Fred N9TA
>

Sverre Holm-2

RE: Sidetone volume

In reply to this post by Fred Bennett N9TA

> I think you may have hit the nail on the head. I DO have to reduce the
> volume greatly when using the headphones. From my perusal of the schematic
> for the K2, it looks like if I changed R36 ....

There isn't really any need to modify resistor values in the K2 to achieve
what you want, unless you like to play inside it. It can be done much
easier, I think, with an external headphone extension cable with a built-in
volume control. A picure explains what I mean better than words: go to
http://www.clasohlson.no/Product/Product.aspx?id=383540 and click on the
picture (this is the one I got locally in Norway).

It will give you continously variable volume control so you don't have to
experiment with fixed resistors inside the K2.

I am sure RadioShack has something similar and that someone else on the list
can help find it.

73

Sverre
LA3ZA
http://www.qslnet.de/la3za/

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n6wg

Re: Sidetone volume

Hi Sverre
The problem with the in-line volume control is that it will reduce the
desired signal
also. What is really requested here is a way to reduce the sidetone level
when using
headphones, but leaving it relatively loud when on speaker. That would be a
neat
programming feat for Wayne, but I don't know if it is really doable.
Imagine, two
sidetone menu settings, one for speaker audio and one for headphone audio.
That would
be an ultimate solution. The volume control would then control the desired
signal,
just as at present.
73, and Happy New year
Bob N6WG
The Little Station with Attitude

----- Original Message -----
From: "Sverre Holm" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, December 27, 2006 5:30 PM
Subject: RE: [Elecraft] Sidetone volume

> > I think you may have hit the nail on the head. I DO have to reduce the
> > volume greatly when using the headphones. From my perusal of the
schematic
> > for the K2, it looks like if I changed R36 ....
>
> There isn't really any need to modify resistor values in the K2 to achieve
> what you want, unless you like to play inside it. It can be done much
> easier, I think, with an external headphone extension cable with a
built-in
> volume control. A picure explains what I mean better than words: go to
> http://www.clasohlson.no/Product/Product.aspx?id=383540 and click on the
> picture (this is the one I got locally in Norway).
>
> It will give you continously variable volume control so you don't have to
> experiment with fixed resistors inside the K2.
>
> I am sure RadioShack has something similar and that someone else on the
list

> can help find it.
>
> 73
>
> Sverre
> LA3ZA
> http://www.qslnet.de/la3za/
>
>
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> Jeg bruker gratisversjonen av SPAMfighter for privatbrukere.
> Den har fjernet 5696 soppelpostmeldinger til na.
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>
> --
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>
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John Lonigro

Re: Sidetone volume

Bob:
One solution might be to set one of your programmable function keys to
be sidetone level. At least that would eliminate the problem of going
through the menu each time you needed to change it.

73's,
John AA0VE

Bob Tellefsen wrote:
> Hi Sverre
> The problem with the in-line volume control is that it will reduce the
> desired signal
> also. What is really requested here is a way to reduce the sidetone level
> when using
> headphones, but leaving it relatively loud when on speaker.
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Sverre Holm-2

RE: Sidetone volume

In reply to this post by n6wg

> -----Original Message-----
>
> The problem with the in-line volume control is that it will
> reduce the desired signal also.

I believe that is exactly what is needed. The inline volume control will
affect both the sidetone level and the audio output just as the suggested
modification of the series resistors R35/R36 for the headphone output also
will.

The problem that one is trying to deal with is the large difference in
sensitivity between the loudpeaker and the more sensitive headphones and
then both the AF level and the sidetone level are affected equally.

73

Sverre
LA3ZA
http://www.qslnet.de/la3za/

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