Re: NEC-LIST: Coil-loading.

One can not tell if sending a message will work as the Canadian server does
not like my (no-choice) headers, but here goes:

    Years ago, I had access to two different Q-meters and the best quality
impedance measuring equipment. As an exploration of the issue of
attainable, unloaded inductor Q, I built and tested a number of coils over
about a two day period

    I could approach a Q of 300. I am able to believe that with further
thought and experimentation one might reach the neighborhood of 450. I
blanch at 1000.

    The coils I am contemplating are air-core, solenoids using copper wire
(at about 24 C). The self resonant frequencies (parallel) of the inductors
were between about 5 and 10 MHz.

    I am keen to learn how to make a passive, air-core inductor with a Q
approaching 1000.

    James C. Mc Laughlin
9:33 PM EST 7 Feb 2005

J. Mc Laughlin; Michigan U.S.A.
Home: JCM_at_Power-Net.Net

<drcuthbert_at_micron.com> writes:
> Doug,
>
> A Q of 300 can be achieved with close spacing of the windings on a
> dielectric rod. A Q of nearly 1000 can be achieved with a properly
> designed air-core solenoid inductor.
>
> Dave Cuthbert
> Micron Technology
>
> -----Original Message-----
> From: nec-list-bounces+drcuthbert=micron.com_at_robomod.net
> [mailto:nec-list-bounces+drcuthbert=micron.com_at_robomod.net] On Behalf Of
> D. B. Miron
> Sent: Monday, February 07, 2005 8:35 AM
> To: nec-list_at_robomod.net
> Subject: Re: NEC-LIST: Coil-loading.
>
> Good day,
>
> Jim is right about the original question. I have a 1943
> copy of Terman and I don't see anything about coil loading.
> He has a very brief paragraph on automobile antennas in
> which he mentions the whip, and plate antennas.
>
> A related question is about coil Q. I read somewhere that
> the maximum practical Q or an air-core solenoid is about
> 300. Does anyone disagree, or have different experience?
> Thanks.
>
> Doug Miron
>
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