Simultaneous audio out & digital out for K2 -- safe?

[Cathy James]

With my Alinco DX-70TH, I have become used to using the waterfall
spectrum display to zero-beat CW signals.  Just spin the tuning knob
until the signal is sitting on the beat frequency, and you're tuned.  I
also like to use my ears to get a rough find on PSK and other digital
signals.  Both are these are very easy with that setup because I get
audio out of the speaker *and* audio into the sound card at the same time.

The K2 cuts off the speaker when I insert the cable into the ext speaker
jack, which makes it almost impossible to do what I describe above.  It
is pretty obvious how to jumper the ext speaker jack to prevent this,
but I don't know if I would be running any risks by doing so.  Do I need
additional isolation circuitry?  Is the audio power out sufficient to
drive both speaker and sound card?  Has anyone else done this?

Cathy N5WVR
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[Don Wilhelm-3]

Cathy,

I don't know how much your soundcard would load down the speaker line (I
would tend to believe not much), but you certainly should not hurt anything,
so give it a try.

If you want a separate audio output line for the soundcard, take a look at
the K2 Fixed Audio Output article on my website http://w3fpr.qrprqdio.com
for some ideas.  I do have boards available for $3 each plus 50 cents
shipping, sorry, but I am out of the kits and do not plan to re-order.

73,
Don W3FPR

> -----Original Message-----
>
> With my Alinco DX-70TH, I have become used to using the waterfall
> spectrum display to zero-beat CW signals.  Just spin the tuning knob
> until the signal is sitting on the beat frequency, and you're tuned.  I
> also like to use my ears to get a rough find on PSK and other digital
> signals.  Both are these are very easy with that setup because I get
> audio out of the speaker *and* audio into the sound card at the same time.
>
> The K2 cuts off the speaker when I insert the cable into the ext speaker
> jack, which makes it almost impossible to do what I describe above.  It
> is pretty obvious how to jumper the ext speaker jack to prevent this,
> but I don't know if I would be running any risks by doing so.  Do I need
> additional isolation circuitry?  Is the audio power out sufficient to
> drive both speaker and sound card?  Has anyone else done this?
>
> Cathy N5WVR
>

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[John Huffman-2]

I use a "Y" cable plugged into the headphone jack.  Worth a try.

73 de NA8M
John

> Both are these are very easy with that setup because I get
> audio out of the speaker *and* audio into the sound card at the same time.
>
> The K2 cuts off the speaker when I insert the cable into the ext speaker
> jack, which makes it almost impossible to do what I describe above.  It
> is pretty obvious how to jumper the ext speaker jack to prevent this,
> but I don't know if I would be running any risks by doing so.  Do I need
> additional isolation circuitry?  Is the audio power out sufficient to
> drive both speaker and sound card?  Has anyone else done this?
>

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