K3 Speaker plug

[Bill W]

Just want to be sure that I understand the External Speaker Jack stereo vs mono plug operation. To clarify, as long as you use the stereo plug, you can select CONFIG:SPKRS 2, regardless of whether or not the other end of the plug is stereo or using stereo speakers.
It is just critical for the radio end to have the stereo plug. Do I have the correct? 
Just making sure I understand.
Thanks
W0BBI - Bill
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[Don Wilhelm-4]

Bill,

I do not understand the utility in connecting both the left and right
speaker outputs to a single speaker - but I don't think it will do any
harm.  Connecting the audio amplifiers together is different than
shorting the right channel to ground by inserting a mono plug.  Why not
connect to stereo speakers and enjoy the AFX or if you have the subRX,
the combinations of main and SubRX receive in each ear (speaker).  
Spread the speakers out so the left speaker is in the left ear and the
right speaker is in the right ear.  If you put the speakers close
together, you will not observe the effects.

I do believe corrective actions have been taken for the audio amplifier
shorted problem, but my memory is fuzzy about what and when.

73,
Don W3FPR

On 9/13/2012 3:04 PM, Bill Wiehe wrote:
> Just want to be sure that I understand the External Speaker Jack stereo vs mono plug operation. To clarify, as long as you use the stereo plug, you can select CONFIG:SPKRS 2, regardless of whether or not the other end of the plug is stereo or using stereo speakers.
> It is just critical for the radio end to have the stereo plug. Do I have the correct?
> Just making sure I understand.
> Thanks
>

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[Joe Subich, W4TV-4]

 > I do not understand the utility in connecting both the left and right
 > speaker outputs to a single speaker - but I don't think it will do any
 > harm.

I would not try it unless the series output resistors are installed in
your K3.  Otherwise use a pair of 2.2 Ohm resistors - one from the tip
and one from the ring to the single speaker.

73,

    ... Joe, W4TV


On 9/13/2012 8:23 PM, Don Wilhelm wrote:

> Bill,
>
> I do not understand the utility in connecting both the left and right
> speaker outputs to a single speaker - but I don't think it will do any
> harm.  Connecting the audio amplifiers together is different than
> shorting the right channel to ground by inserting a mono plug.  Why not
> connect to stereo speakers and enjoy the AFX or if you have the subRX,
> the combinations of main and SubRX receive in each ear (speaker).
> Spread the speakers out so the left speaker is in the left ear and the
> right speaker is in the right ear.  If you put the speakers close
> together, you will not observe the effects.
>
> I do believe corrective actions have been taken for the audio amplifier
> shorted problem, but my memory is fuzzy about what and when.
>
> 73,
> Don W3FPR
>
> On 9/13/2012 3:04 PM, Bill Wiehe wrote:
>> Just want to be sure that I understand the External Speaker Jack stereo vs mono plug operation. To clarify, as long as you use the stereo plug, you can select CONFIG:SPKRS 2, regardless of whether or not the other end of the plug is stereo or using stereo speakers.
>> It is just critical for the radio end to have the stereo plug. Do I have the correct?
>> Just making sure I understand.
>> Thanks
>>
>
> ______________________________________________________________
> 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
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[Dave Hachadorian]

-----Original Message-----
From: Joe Subich, W4TV
Sent: Thursday, September 13, 2012 5:36 PM
To: [hidden email]
Subject: Re: [Elecraft] K3 Speaker plug

I would not try it unless the series output resistors are
installed in
your K3.  Otherwise use a pair of 2.2 Ohm resistors - one from
the tip
and one from the ring to the single speaker.
----------------------------------

That reminds me -- I thought Elecraft was going to issue a series
resistor mod to protect the speaker amplifier device.  I still
don't see it in the official list of mods.


Dave Hachadorian, K6LL
Big Bear Lake, California

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[David Pratt]

It's there, Dave....

http://www.elecraft.com/K3/mods/AF_Output_Mod_Rev_C.pdf

73 de David G4DMP

In a recent message, Dave Hachadorian <[hidden email]> writes
>That reminds me -- I thought Elecraft was going to issue a series
>resistor mod to protect the speaker amplifier device.  I still
>don't see it in the official list of mods.

--
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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