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
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