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[K3] Feature request: MON in headphones only when SPKR+PH=yes

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Thomas Horsten

[K3] Feature request: MON in headphones only when SPKR+PH=yes

I guess the subject line says it all - I would like to hear my audio
feedback in the headphones but not through the speaker, so as to not create
distortion/feedback, I wonder if it could be done in the firmware, if it's
possible, I'd appreciate an entry on the todo list :)

Any comments/suggestions?

73, Thomas M0TRN
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Joe Subich, W4TV-4

Re: [K3] Feature request: MON in headphones only when SPKR+PH=yes

> I wonder if it could be done in the firmware, if it's possible, I'd
> appreciate an entry on the todo list :)

Headphone and Speaker audio share a common source (the same digital to
analog converter). There is no a separate audio feed for headphone and
speakers (K3 Schematics package, pg 28 and 29).

What Wayne would need to do is mute the speaker (shutdown the speaker
amplifier) during transmit - and only for voice (AM, FM, SSB) modes.
However, if you notice the shutdown behavior of the speaker amplifier
it does not turn off instantly and generates a lot of distortion during
the process. That ramp down and distortion would be very annoying.

73,

... Joe, W4TV

On 3/9/2012 4:59 PM, Thomas Horsten wrote:

> I guess the subject line says it all - I would like to hear my audio
> feedback in the headphones but not through the speaker, so as to not create
> distortion/feedback, I wonder if it could be done in the firmware, if it's
> possible, I'd appreciate an entry on the todo list :)
>
> Any comments/suggestions?
>
> 73, Thomas M0TRN
> ______________________________________________________________
> 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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Thomas Horsten

Re: [K3] Feature request: MON in headphones only when SPKR+PH=yes

Joe,

On 9 March 2012 22:29, Joe Subich, W4TV <[hidden email]> wrote:

]What Wayne would need to do is mute the speaker (shutdown the speaker
> amplifier) during transmit - and only for voice (AM, FM, SSB) modes.
> However, if you notice the shutdown behavior of the speaker amplifier
> it does not turn off instantly and generates a lot of distortion during
> the process. That ramp down and distortion would be very annoying.
>

If that's the case then of course it wouldn't make sense to do.

haven't noticed that effect on my K3 and actually when just tested it now
I don't hear anything other than a very faint click when the speaker
switches off (I have PF2 programmed to toggle SPKR+PH). Maybe it's only on
some K3's?

73, Thomas
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Joe Subich, W4TV-4

Re: [K3] Feature request: MON in headphones only when SPKR+PH=yes

> haven't noticed that effect on my K3 and actually when just tested it
> now I don't hear anything other than a very faint click when the
> speaker switches off (I have PF2 programmed to toggle SPKR+PH). Maybe
> it's only on some K3's?

Toggle SPKR+PH with audio (e.g. WWV) at normal listening level. Both
of my K3s ramp audio down over about 1/3 to 1/2 second and the audio
gets very distorted just before shutting off.

73,

... Joe, W4TV

On 3/9/2012 6:15 PM, Thomas Horsten wrote:

> Joe,
>
> On 9 March 2012 22:29, Joe Subich, W4TV<[hidden email]> wrote:
>
> ]What Wayne would need to do is mute the speaker (shutdown the speaker
>> amplifier) during transmit - and only for voice (AM, FM, SSB) modes.
>> However, if you notice the shutdown behavior of the speaker amplifier
>> it does not turn off instantly and generates a lot of distortion during
>> the process. That ramp down and distortion would be very annoying.
>>
>
> If that's the case then of course it wouldn't make sense to do.
>
> haven't noticed that effect on my K3 and actually when just tested it now
> I don't hear anything other than a very faint click when the speaker
> switches off (I have PF2 programmed to toggle SPKR+PH). Maybe it's only on
> some K3's?
>
> 73, Thomas
>