In article , tony sayer
scribeth thus

Heres one I'd like to run past the leccy whizzes hereon for comment.

I have a need to twiddle a large FM radio aerial to three distant
transmitters that are 110 deg apart.

Managed to find a very nice aerial rotator on e-bay, brand new made by
RCA in America at a very reasonable price.



Thanks for all the replies! In no real order, the aerial concerned is a
FUBA UK Stereo 8 this is a bit of a beastie its an old design but its
been "renovated" It has a very narrow forward acceptance angle if it
were as simple as using a couple of aerials I'd have done that!. But
there is a situation where one Transmitter is only a 100 kHz away from
another so as best possible discrimination is needed.

I think we'll give up with the cap dropper idea, they did back in the
day go short which was fun not! for the series connected valves but
there do look to be much better plastic poly whatever around today.

The problem using the Switch mode units is I believe the motors are AC
driven, there does not look to be any rectifier or switch mode built in
to the unit furthermore the transformer looks a bit fiddley to rebuild
and the extra wire needed for the UK mains may not fit so the idea of
using an existing tranny and tapping that at half way in autotransformer
mode seems OK and I do have a Toroid that would fit in there, but TNP's
reference to a simple 230 to 110 volts plug type reducer looks the job
so i think we'll go for that!

RS have one but its on flying leads and three times the price!

Cheers..

--
Tony Sayer


Man is least himself when he talks in his own person.

Give him a keyboard, and he will reveal himself.