[Elecraft] Connecting SDRPlay to P3 IF OUT, to CW Skimmer

[Peter Dougherty]

I had an LP-PAN and sound card and could never get them to work very well
(they're up for sale for anybody who's interested). I don't think I
understand the whole RX-OUT/splitter/back to RF-in loop. Doing that would
mean I would have no RX antenna connection, would it not? I use the RX IN
connection for the feed from my K9AY loop in the back yard. If I used the
RX-OUT port, wouldn't I then lose my lowband RX antenna?

This is all still very unclear to me. I don't mind buying the Win4K3 suite,
but the COM port issues are confusing. 99% of the time I won't be using the
Win4K3 software and associated control. It's only going to be used for CW
contesting, period. The rest of the time I just use it as a conventional
radio for CW, SSB, FT-whatever, and RTTY. 

 - pjd

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Barry
Sent: Thursday, May 23, 2019 9:10 PM
To: Bob McGraw K4TAX <rmcgraw at blomand.net>; elecraft at mailman.qth.net
Subject: Re: [Elecraft] Connecting SDRPlay to P3 IF OUT, to CW Skimmer

You can do that. In fact I did that initially, I now use a Minicircuits Lab
2 way splitter and an about 6 db gain buffer amp between my K3s and the
divider. This seemed to give me a bit better spectrum display. You will need
NO SDR protection as you are using the receiver IF.

I did use HDSDR during one of my early configurations. It just seemed harder
to set up than what I use now. But, it won't require spending for an LP pan
and sound card. Hmmm. I think I just got the answer to a question I had
raised about using the I&Q data available from the K4 USB connector for CW
Skimmer. I suspect the formats are the same.

Your description at the bottom of your note will work if all you want is
spectrum display, but to do serious integration like marrying up logging,
spotting spectrum display CW skimmer and then a contest configuration, you
are going to need to distribute and receive K3 band, frequency, and mode
data. Using Win4K3 suite with com0com does make that easy and you could use
what you describe using a pair of virtual ports. 
Should work well.

73,
Barry
K3NDM

------ Original Message ------
From: "Bob McGraw K4TAX" <rmcgraw at blomand.net>
To: elecraft at mailman.qth.net
Sent: 5/23/2019 8:36:06 PM
Subject: Re: [Elecraft] Connecting SDRPlay to P3 IF OUT, to CW Skimmer

>Why not take the RX OUT of the K3 to a BNC T  and the RX IN of the K3  to
the other side of the BNC T and with a BNC T  in that path, feed that to the
SDR receiver.  Then on the K3 press the RX ANT button and both are fed the
entire band from the same antenna and they are protected during transmit.
You can use HDSDR and OmniRig to control both the SDR receiver and control
the K3.  With HDSDR and OmniRig it communicates both ways.
>
>Two short BNC to BNC jumpers, a BNC T and a short BNC to the input on the
SDR is all that is needed.
>
>73
>
>Bob, K4TAX
>
>
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