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There's one on ebay right now for $30. 
https://t.ly/VVnjv

A better option would be a JVDE XTB-IIr - IF you can find one. Sadly, they are no longer available.

Thanks, Brobin, for you helpful suggestions, but you still leave me wondering about the XPCR Phase Coupler/Repeater by X-10 Pro, especially since you refer me back to a used Leviton/Decora model HCA02.  Is the XPCR (still in production) known to be no good, or is it worth trying another from a different distributer?

Regards -- jclarkw

I just install the wifi module after letting it sit on the shelf for several months. Setup was easy and all seemed to be good.


However, commands sent from via the app appear to be going through since as each command is sent , the wifi module yellow LED flashes. But the devices  are not triggering. The wifi module has a steady blue led until a command in the app us sent.

ALgee

Here is what I had to do to get always a reasonably good time on WM100 without regular phone connections:

WM100 is set to 1am after power off.

So I have a Wifi smart plug that is scheduled to daily power cycle at 1am. WM100 is connected to power through that WiFi smart plug.

The setup has been working ok for years. The main negative: losing day of week, WM100 resets to Saturday on power cycle (not sure of Sat or Sun)

A better option would be a JVDE XTB-IIr - IF you can find one. Sadly, they are no longer available.

I wound up with some extra XTB-IIR PCBs.  I might consider a custom build, but it would be significantly more expensive because many of the components would have to be reordered at single quantity prices.

Jeff

There's one on ebay right now for $30. 
https://t.ly/VVnjv

A better option would be a JVDE XTB-IIr - IF you can find one. Sadly, they are no longer available.

I've been using a Leviton/Decora model HCA02 for years (before that, a CR230 from Advanced Control Technologies).  Now it's failed -- apparently totally dead -- and my signals no longer pass between power legs, although within legs everything still works.

I searched with Google, and the only comparable unit I could find was the XPCR Phase Coupler/Repeater by X-10 Pro.  I ordered one from Amazon and installed exactly as before, but it didn't do anything!  The LED didn't even illuminate on receipt of X-10 signals.  Several Questions:

Have others had trouble with these units?
Might I have inadvertently killed the new unit?  (I have a good-quality surge suppressor on the power system.)
Is there any alternative to the XPCR anymore?
Might I have better success ordering directly from X-10?

Thanks in advance for any help! -- jclarkw

   Sounds like you have found the issue.
I probably would replace both if they are the same age.

Well, it appears to be the larger of the two electrolytics (470 uF/50V). I unsoldered the two caps and that one was no good according to my capacitor tester. I don't currently have another cap that fits but I tested it with a 1000 uF/50V cap hanging outside the case with wires, like a hernia, and the PSC05 is now transmitting correctly. Time to find replacement caps.

My PSC05 failed before I designed the XTB-523.  As I recall, it was a zener diode.  I might have replaced the electrolytic too at the time.  But I had another X10 controller fail due to the .22uF 120KHz coupling capacitor deteriorating.  Replacing that got it working again.

There are fewer than 50 XTB-523, and just 14 XTBR left now.

Jeff

I don't use any of them myself now.
I got some PSC05 modules with WGL V572 all address receivers.
Unused now as the TW523 port on my XTB-IIR is being used.
I actually observed a possible problem.
Over the years the gold contacts of the connector. Have tarnished (black) and I don't know how well they would work now.
My brown PCB was just a thing you may see not a known issue in those modules.
Mine was in an RR501.
18V Zener that I changed to two 9V in series. Both the same wattage as the original 18V.