I'm going to build a square
variometer.
I think the outside coil will
be square. The inside coil
will probably be more like
a rectangle.
I'm going to try this because I
I'm going to build a square
variometer.
I think the outside coil will
be square. The inside coil
will probably be more like
a rectangle.
I'm going to try this because I
think it may be easier for me
to construct one in this shape.
(As opposed to the regular shape,
which uses cylinder shaped coils.)
i have built variometers before -
to be part of loading coils for
Part 15 transmitters feeding
3 meter antennas.
It's just another experiment. If
it's helpful in loading my SS-Tran
AMT-3000 up to a 3 meter stick, I'll
let you know.
Best Wishes,
Bruce, DRS2
I would like to hear your results with the rectangular variometer.
I am working on a triangular loading coil for the AMT3000 and it is coming along fine, just needs a little more wire.
Someone on this site or perhaps in a book said that the geometry of a coil doesn't matter, it's all a case of of wire being looped over and over and over until the right inductance is reached.
If anyone has further information about the effect of shape upon a coil, please say.
fashion one after this. you can easily see how it is constructed and replicate it.
That variometer is a treat on the eye, very interesting to admire and look at.
It doesn't seem to give any description, so what sort of purpose do you think it was built for?
What would happen if you wound a few turns and couple (not direct connect) a toroid like THIS (click) with a loading coil, and turn it like a variometer or move it up and down inside?.
put that in the final output of a rangemaster or sstran!!!!!!
Oh man, the green toroids are a gotta have!
Imagine those in your RF output chain.
One advantage to toroids is they have little if any leakage flux meaning the magnetic field is almost entirely contained within the toroid. This precludes their use as a varometer.
Also, care needs to be used when selecting a toroid core material type for a particular application. Most do not work well at upper BCB frequencies, Though there have been attempts to standardize the color coding the green color of the toroid linked above may not be meaningful. Without knowing what type material this toroid uses and whether it works at BCB frequencies I wouldn't buy it.
Neil
I could have sworn I posted
a thank you note to all of you
last night on this thread.
I guess I must have typed it and
deleted it by mistake.
Typical me, I've done that so many
times.
Best Wishes,
Bruce, DOGRADIO STUDIO 2
"-- The magnetic field is almost entirely contained within the toroid. This precludes their use as a variometer. Also, care needs to be used when selecting a toroid core material type for a particular application. Most do not work well at upper BCB frequencies,"
Yes, I remember that now. So a direct connection would be of more value as a filter, yes? I do recall the difference in materials, and I have no idea what the color-coding is, so I''ll look it up ... thanks Neil ...