[Elecraft] P3/TX Mon Coupler Switching Idea

[Clay Autery]

Followup:

Looking in the manual, the picture of the TXMON board clearly shows that
the modular jack has 8 conductors.  I'm almost certain that is an RJ-45
8P8C jack...
But from what I can see, they are using AT LEAST conductors 2,4,6, and
8... (the solid wires for both 568A and 568B). You can see traces coming
back from those 4 conductors to some SMT components on the board
indicating the conductors are in use.  Cannot tell if the other four
connect at the board for sure.

So... either they are 1) using all 8 wires, 2) Using 4 wires and
grounding the paired wires to reduce crosstalk or RFI, or 3) they are
using 4 wires for signals and leaving the other four completely open,
thus surrendering the value of twisted pair.

High probability that Elecraft used straight through wiring but verify
anyway...


Bottom Line...  LOOK at your coupler cable.... count the conductors... 
If there are 8, then good.  Take the two ends and hold them side by side
with gold conductors facing you.  IF the conductor color code from left
to right match between the two cable ends, it is straight through wiring
on the patch/jumper cable.  Pretty conclusive that all you need to do is
use quality CAT5e or better patch cables... chore over.

But at least go through the verification process.

The more I think about it, no to, the more I am beginning to believe the
"RJ8" think in the manual is a typo ripe for inclusion on an Errata
sheet.  :-)

______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 6/18/2016 4:36 AM, Mike VE3YF wrote:
> Hi Alan:
>
> Tnx for the info, good to see someone else has done it. Question though, does the Coupler cable use RJ45 connectors, reason I ask I see on the Elecraft site it says RJ8, and I am not finding too much info on the Internet ref RJ8 Connectors. Perhaps I am reading too much into it.
>
>
>
> 73 De Mike
> VE3YF
>
> http://www.ve3yf.com
> [http://www.ve3yf.com/]
> ______________________________________________________________
> 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 cautery at montac.com