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K2 constant-level audio for PSK31 = link to photos

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Alan D. Wilcox, W3DVX

K2 constant-level audio for PSK31 = link to photos

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

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RobertG

Re: K2 constant-level audio for PSK31 = link to photos

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:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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Don Wilhelm-4

Re: K2 constant-level audio for PSK31 = link to photos

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:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
>

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Help: http://mailman.qth.net/mmfaq.htm
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RobertG

Re: K2 constant-level audio for PSK31 = link to photos

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:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>>>
>>
>
>

Alan D. Wilcox, W3DVX

Re: K2 constant-level audio for PSK31 = link to photos

In reply to this post by Alan D. Wilcox, W3DVX

UPDATE: Just added the photos for K2-5373, my project K2 that I still
use. See http://wilcoxengineering.com/k2-5373/

-----------

On 3/29/14, 2:34 PM, Alan D. Wilcox wrote: