Michael Schlotter wrote:
Does anybody know which sort of signal goes from the
Borgelt B40 vario to the external averager? Is it just
a voltage or something more complicated? The reason
I want to know it is that I'd like to make up my own
display instead of buying the original one which is
rather bulky. The only alternative would be to buy
the small display for the B400, but are they compatible?
Any comments welcome.

The logic person to contact is Mike Borgelt, you can get his email
address from his web site. I've always found him to be quite helpful
with questions like this. The signal from the B40 is analog, I believe
it swings +/- 1V (+/- 10 kts or 5 m/s) from a 2.5V reference. I believe
the same signal is used for the repeater, so the averaging is likely
being done by a separate circuit in the external unit...

Marc