[Elecraft] K2 constant-level audio for PSK31 = link to photos

[Robert G Strickland]

Don...

As always! Clear and helpful. Thanks for your effort to present a full 
commentary. Thanks to you also, Alan, for diving and providing the 
learning opportunity. Go Elecraft.

...robert

On 3/30/2014 00:01, Don Wilhelm wrote:
> Robert,
>
> I can answer that.  "It all depends ..."
>
>    If your soundcard can handle the lower levels from the Product
> Detector, all will be fine, but some soundcards do not.  Notice that
> Alan has wired the tip to one side of the Product Detector output and
> the ring to the other side.  The result is a 3 dB drop in audio signal
> level because most applications only use the left channel input (the
> signal on the tip).  If your soundcard can handle that, then no buffer
> amp is required, but if not, take a look at the W3FPR Fixed Audio Output
> on my website www.w3fpr.com.  That will provide about a 1.5 volt signal
> to the soundcard for an S-9 input signal.
> In addition, the takeoff points I have suggested are after the muting
> circuits, so if you want to do recording of the receive signal, you will
> not suffer from the noise during transmit.  The circuit will work fine
> if you change the inputs prior to the muting transistors (the RF board
> J5 connections).
>
> 73,
> Don W3FPR
>
> On 3/29/2014 6:42 PM, Robert G Strickland wrote:
>> Alan...
>> I notice that you have an audio out for the K2 that does not use a
>> buffer board. What's your experience with this approach? And to
>> others, this seems pretty straight forward. If so, why use a buffer
>> board?
>> ...robert
>>
>> On 3/29/2014 18:34, Alan D. Wilcox wrote:
>>> Hello,
>>>
>>> Gradually I'm rebuilding my Elecraft site ... and latest is at
>>> http://wilcoxengineering.com/2014/03/27/digital-radio/
>>> This weekend I put in some photos of the constant-level audio connection
>>> I added to my K2 to run PSK31
>>>
>>> Now I need to show the actual setup and configuration ... next week!
>>>
>>> Any special photos you'd like to see? Reply off list please.
>>>
>>> Enjoy,
>>> Alan
>>>
>>> Alan D. Wilcox, W3DVX (K2-5373, K3-40)
>>> 570-478-0736
>>> Williamsport, PA 17701
>>>
>>>
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to rcrgs at verizon.net
>>>
>>
>
>

-- 
Robert G Strickland, PhD ABPH - KE2WY
rcrgs at verizon.net.usa
Syracuse, New York, USA