K3/P3 TXD tap

[Mike K4PI]

I used serial data with my K3S/P3/Steppir/HF Amp set up for a long time
by using Y cables to get data to all of them. So finally decided to
change over to USB 100% which I did but now using the CBLP3Y cable on
the K3S/P3 combo I am still going to need some kind of Y connection
again to tap off of RXD/TXD.  I am looking at making a Y cable to
install between the P3 PC DE9P connector to pick up RXD or TXD from it
and let the amp monitor that.  I know you can buy cables and even
circuit boxes to do this but I wanted to build this one myself as I
built the one Steppir used and it worked great.   If you want to see
what Steppir does, S13 cable, see the link below.

www.steppir.com/wp-content/uploads/2011/10/Y-Cable.pdf

If anyone has done this home brew I would like to know how you did it,
ie which connector on the P3 and which pins.  I need more than just band
data provided by the ACC plug for the amp and Steppir.  Too bad there is
not a RXD/TXD tap in the K3 ACC plug or a tap plug in the P3.  I guess
one could be installed in the P3 blank slots and tap over to the RXD/TXD
connectors,  73 Mike K4PI

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[Don Wilhelm]

Mike,

No matter what you do, make certain the TXD and RXD lines have only one
driver on them.  That would be the driver in the K3 and the other in
your computer.

Configure any other gear to "listen only" to the traffic between the
computer and the K3/P3.

On 3/17/2019 2:25 PM, K4PI wrote:

> I used serial data with my K3S/P3/Steppir/HF Amp set up for a long time
> by using Y cables to get data to all of them. So finally decided to
> change over to USB 100% which I did but now using the CBLP3Y cable on
> the K3S/P3 combo I am still going to need some kind of Y connection
> again to tap off of RXD/TXD.  I am looking at making a Y cable to
> install between the P3 PC DE9P connector to pick up RXD or TXD from it
> and let the amp monitor that.  I know you can buy cables and even
> circuit boxes to do this but I wanted to build this one myself as I
> built the one Steppir used and it worked great.   If you want to see
> what Steppir does, S13 cable, see the link below.
>
> www.steppir.com/wp-content/uploads/2011/10/Y-Cable.pdf
>
> If anyone has done this home brew I would like to know how you did it,
> ie which connector on the P3 and which pins.  I need more than just band
> data provided by the ACC plug for the amp and Steppir.  Too bad there is
> not a RXD/TXD tap in the K3 ACC plug or a tap plug in the P3.  I guess
> one could be installed in the P3 blank slots and tap over to the RXD/TXD
> connectors,  73 Mike K4PI

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Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html