The rotary encoder would be used, with some sort of position feedback to
change the obs setting if in the VOR mode, in the GS mode it does nothing.
Your thoughts on the 9 step system are exactly what I was thinking of, but
you were able to explain it clearly.
Thoughts on how it would work?

"RST Engineering" wrote in message
.. .
I'd probably use a 9-step system. Green in the center, then orange,
yellow, blue, and red going up and down. What does the rotary encoder do?

Jim


"Scott" wrote in message
.. .
Should be easy enough using op-amp comparators with resistors setting up
a 10 or 20 step voltage divider as a reference. For example, if the
voltage swing that drives an analog meter goes from 0 volts for the
needle at its full down position (high of GS) to 5 volts at its upper
most swing (low of GS), the comparators compare the voltage used to move
the needle and light a corresponding LED (at 2.5 volts, or half-scale,
the green LED would be lit)...Terra produced just such a radio back in
the 80s...I think it was called the Tri-Nav C...

Scott


Fonz wrote:

This question is mainly aimed at Jim Weir, but others are more than
welcome to give their 2c.
With the aero-lectrics column in kitplanes, a GS tester has just been
completed.
My question. How hard would it be to make a GS indicator, with say LEDs
instead of lines and needles. For example, when going down the
glideslide, needles centred, you get a Green led in the centre, diverge
and get yellow, really off and get red, the universal warning. Rotary
encoder with 7 segment leds for OBS. How hard would this project be?
(considering the grand scale of the test unit just completed).
Obviously not for Primary use, but as a tester for radios, and possibly
a back-up unit.
Thanks.
Just a thought.
Rob
Australia.