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This is not a WeeWX issue!

I thought I post on this forum due to the audience being very familiar with 
this weather station.

I had a wh3081 for four years, until the radiation sensor died a while ago. 
It was working perfectly.
I replaced it with the same model, and put the external unit where the 
previous station was mounted.
All good for a couple of days, when all of a sudden, around 15:00 each day, 
the signal goes to zero.
As a side effect, when it comes back, it may send a false rain gauge 
signal; e.g. 30mm or 800mm per hour.

It can't be the battery or solar panel charger, as the unit happily sends 
data for the other 23 hours of the day.

One theory is: The unit sits in the sun, and enters shade around that 
time... maybe it got all heated up, and when cooling down, the change in 
temperature triggers a micro crack or cold solder point to come into play.

Any other creative theories or experiences to find the problem?

My approach was:
a) to put the batteries from the old unit into the new one; but, since the 
battery seems to work fine for the other 23 hours; I gave this idea a miss.
b) Pull the station down and look for cold solder points.

Is there a 433MHz receiver I could use to see if the station sends a signal?
Yes, it has a LED, which I think should blink when it sends, but then I do 
not want to stand on the ladder and wait for it :)

Any hints appreciated. thanks.

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