Induction Balance Stuff - Single/Multi Frequency Response, GB, Disc, Measurements, Ideas, Fun, etc.

[Aziz]

Hi all,

for a perfect low-loss High-Q mono coil (VLF), I have to buy somewhere a true HF-Litz wire.
I have found one: 200 m roll, 45 x 0,07 0,60mm for 32 bucks.
As it is relative thin, I have to divide the 200 m into 4 - 5 strands and twist them. This should be enough for one mono coil.

I'll think of it.

Let's finish the ribbon mono coil with tiny SMD NP0/C0G LC-tank capacitors first.
Aziz

[Aziz]

Hi all,

I am not happy with my ribbon mono coil yet. Too big and too much weight. The PVC insulation adds a lot of weight to the coil. The coil bundle might produce microphonic effects (it is not a tight coil bundle yet). And it isn't easy to tame the coil bundle. Finalising the coil into coil housing would add more weight. This coil isn't convenient for real field operation. It was a bad idea to use the ribbon cable.

I am looking for other leight weight, simple & easy solutions.

This solution should be easy possible:
The total mono coil is split into two coil halves (each N/2 turns count) with each tight coil bundles, set co-planar, offset center placed in a polystyrene foam groove and fixed.
Coil part 1 is the smaller inner coil half. Coil part 2 is the larger outer coil half.
Wire: thick enamelled copper wire or true HF-litz wire. There is no additional thick or PVC insulation anymore.

Here is the sketch of the mono coil and the zero field drawing:


The zero-field section is easily accessable for placing the NP0/C0G SMD capacitors and soldering the connectors.
We would have less parasitic coil capacitance and less proximity effect too.

A light weight coil design is easily possible. And simple to build too.
Aziz

[Aziz]

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