Re: [Elecraft] K2 audio output question

2021-01-05 Thread Chuck Chandler 
Thanks for the tip!

73 de Chuck, WS1L

chandler...@gmail.com


On Mon, Jan 4, 2021 at 12:35 PM Geert Jan de Groot  wrote:

> On 04/01/2021 04:13, elecraft-requ...@mailman.qth.net wrote:
> > Is there a way to have both headphones and external speaker active at the
> > same time?  I'm thinking of being able to have audio for visitors while
> > still using headphones to copy.
>
> In addition to Don's response, you may want to look at this:
> https://www.w8fgu.com/pics/k2faob/w3fpr_K2%20audio%20Fix.pdf
> http://www.w3fpr.com/download_files/FP-CB%20mounting%20photos.pdf
>
> I have done this, using a piece of perfboard.
> To avoid shorts, in my case the PCB is in a piece of heat shrink tube.
>
> If you want a kit, check out https://www.w8fgu.com/k2_fixedaudio.html
>
> Instead of perfboarding it, I should have bought a kit from Dave, but
> sending a parcel by mail to PA0 would need me to mortgage my house, not
> to mention a lot of patience (another PCB ordered recently was stuck for
> *nine months* in Chicago).
>
> The advantage is that the 2nd output is fixed audio volume, so you can
> adjust the speaker audio and the headset audio separately.
>
> In my case (connecting multiple headsets on the speaker output) this
> approach has another advantage: I added audio sidetone to my K2 so that
> the people using headphones can hear eachother speak, yet the
> fixed-audio output doesn't have this, so there is no feedback from the
> speaker.
>
> When you use a speaker, make sure you use one that works well for SSB
> audio. For visitors, I would consider making some headsets available
> instead. SSB-via-speaker is more difficult to decode, SSB-via-speaker
> for people without SSB ears will just result in "there was a guy playing
> radio noise" at the exhibition.
>
> 73,
>
> Geert Jan PE1HZG
>
>
>
>
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Re: [Elecraft] K2 audio output question

2021-01-04 Thread Geert Jan de Groot 

On 04/01/2021 04:13, elecraft-requ...@mailman.qth.net wrote:

Is there a way to have both headphones and external speaker active at the
same time?  I'm thinking of being able to have audio for visitors while
still using headphones to copy.


In addition to Don's response, you may want to look at this:
https://www.w8fgu.com/pics/k2faob/w3fpr_K2%20audio%20Fix.pdf
http://www.w3fpr.com/download_files/FP-CB%20mounting%20photos.pdf

I have done this, using a piece of perfboard.
To avoid shorts, in my case the PCB is in a piece of heat shrink tube.

If you want a kit, check out https://www.w8fgu.com/k2_fixedaudio.html

Instead of perfboarding it, I should have bought a kit from Dave, but 
sending a parcel by mail to PA0 would need me to mortgage my house, not 
to mention a lot of patience (another PCB ordered recently was stuck for 
*nine months* in Chicago).


The advantage is that the 2nd output is fixed audio volume, so you can 
adjust the speaker audio and the headset audio separately.


In my case (connecting multiple headsets on the speaker output) this 
approach has another advantage: I added audio sidetone to my K2 so that 
the people using headphones can hear eachother speak, yet the 
fixed-audio output doesn't have this, so there is no feedback from the 
speaker.


When you use a speaker, make sure you use one that works well for SSB 
audio. For visitors, I would consider making some headsets available 
instead. SSB-via-speaker is more difficult to decode, SSB-via-speaker 
for people without SSB ears will just result in "there was a guy playing 
radio noise" at the exhibition.


73,

Geert Jan PE1HZG



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Re: [Elecraft] K2 audio output question

2021-01-03 Thread Walter Underwood 
My KX3 only has a Phones output and that won’t drive speakers well, so I use an 
off-the-shelf headphone splitter and a cheap audio amp that runs off 12 V. The 
details are here.

https://observer.wunderwood.org/2017/03/04/speakers-for-my-elecraft-kx3/ 


It looks like that particular audio amp isn’t available now, but there are 
plenty of similar cheap ones on Amazon.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 3, 2021, at 10:26 AM, Don Wilhelm  wrote:
> 
> Chuck,
> 
> Yes, you can do that by soldering a jumper across the switch at the rear of 
> the headphone jack.
> If you prefer not to add the jumper, plug stereo computer speakers into the 
> headphone jack and plug your headphones into the headphone jack on the 
> speaker.
> Try different computer speakers, some mute the speakers when headphones are 
> plugged in, others do not.
> 
> 73,
> Don W3FPR
> 
> On 1/3/2021 12:58 PM, Chuck Chandler wrote:
>> I've recently begun volunteering aboard the museum ship USS Slater, where
>> they have a K2 in Radio Central.  I've looked through the manual, but might
>> have overlooked this.
>> Is there a way to have both headphones and external speaker active at the
>> same time?  I'm thinking of being able to have audio for visitors while
>> still using headphones to copy.
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Re: [Elecraft] K2 audio output question

2021-01-03 Thread Don Wilhelm 

Chuck,

Yes, you can do that by soldering a jumper across the switch at the rear 
of the headphone jack.
If you prefer not to add the jumper, plug stereo computer speakers into 
the headphone jack and plug your headphones into the headphone jack on 
the speaker.
Try different computer speakers, some mute the speakers when headphones 
are plugged in, others do not.


73,
Don W3FPR

On 1/3/2021 12:58 PM, Chuck Chandler wrote:

I've recently begun volunteering aboard the museum ship USS Slater, where
they have a K2 in Radio Central.  I've looked through the manual, but might
have overlooked this.

Is there a way to have both headphones and external speaker active at the
same time?  I'm thinking of being able to have audio for visitors while
still using headphones to copy.


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[Elecraft] K2 audio output question

2021-01-03 Thread Chuck Chandler 
I've recently begun volunteering aboard the museum ship USS Slater, where
they have a K2 in Radio Central.  I've looked through the manual, but might
have overlooked this.

Is there a way to have both headphones and external speaker active at the
same time?  I'm thinking of being able to have audio for visitors while
still using headphones to copy.

Thanks,

73 de Chuck, WS1L

chandler...@gmail.com
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