Re: LF: RE: Re: Antenna relays - multifilar Litz coil

To:	[email protected]
Subject:	Re: LF: RE: Re: Antenna relays - multifilar Litz coil
From:	Andy Talbot <[email protected]>
Date:	Thu, 19 Nov 2015 22:33:53 +0000
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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:

H

indeed, parallel capacitor will increase the coil current, but on the other hand you will get resonance with a smaller inductance. I haven't done any calculation on the case (yet), but probably both effects (larger current vs smaller coil) will more or less compensate each other.

73, Rik ON7YD - OR7T

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RE: LF: Re: Antenna relays, (continued) RE: LF: Re: Antenna relays, Rik Strobbe Re[2]: LF: Re: Antenna relays, Chris Wilson Re: Re[2]: LF: Re: Antenna relays, Andy Talbot Re[4]: LF: Re: Antenna relays, Chris Wilson Re: Re[2]: LF: Re: Antenna relays, Graham Re[4]: LF: Re: Antenna relays, Chris Wilson Re: Re[4]: LF: Re: Antenna relays, Graham RE: Re[2]: LF: Re: Antenna relays, Rik Strobbe LF: Re: Antenna relays - multifilar Litz coil, Markus Vester LF: RE: Re: Antenna relays - multifilar Litz coil, Rik Strobbe Re: LF: RE: Re: Antenna relays - multifilar Litz coil, Andy Talbot <= Re: LF: Antenna relays, DK7FC Re: LF: Antenna relays, Andy Talbot Re[2]: LF: Antenna relays, Chris Wilson Re: LF: Antenna relays - bifilar coil, Markus Vester

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