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| Subject: | Re: LF: RE: Re: Antenna relays - multifilar Litz coil |
| From: | Markus Vester <[email protected]> |
| Date: | Thu, 19 Nov 2015 17:48:58 -0500 |
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... but you could additionally increase wire diameter by sqrt(2) for the same coil length. Assuming skin effect regime, this will decrease R by another factor of sqrt(2). In other words, same coil Q at same coil size. In total, you get (2i)^2*R/2 => doubled power loss.
73, Markus
-----Ursprüngliche Mitteilung----- Von: Andy Talbot <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Do, 19 Nov 2015 11:36 pm Betreff: Re: LF: RE: Re: Antenna relays - multifilar Litz coil That's a very interesting observation, and a simple calculation shows the way it will move:
If we add some extra || capacitance that is equal to that of the antenna, the loading coil inductance needs to be halved. To a rough first approximation, the number of turns needed will reduce by SQRT(2) since L ~ N^2 , so the length of winding and coil R will lower by this amount too. So R becomes R/SQRT(2)
Coil circulating current will double, so additional loss is 2 / SQRT(2)
SO worse, but not as bad as first thought
'jnt
On 19 November 2015 at 22:08, Rik Strobbe <[email protected]> wrote:
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