Do you see corona, Dick?
On Aug 6, 2006, at 1:48 PM, PA3DUV wrote:
> The loading coil of my HiQ 5-160 centerloaded vertical has an
> impedance of
> 10 + J 3494 ohms
>
> @ 1200 watt (f=1.9 MHz) input at the antenna feedpoint the voltage
> over the
> loading coil is 29 910 volt and the current 8.56 A.
>
> Cheers, Dick
> PA3DUV
>
>
> ----- Original Message -----
> From: "Tom W8JI" <w8ji@w8ji.com>
> To: "PA3DUV" <pa3duv@planet.nl>; <amps@contesting.com>
> Sent: Sunday, August 06, 2006 8:37 PM
> Subject: Re: [Amps] Ameritron Amps
>
>
>>> Polycarbonate seems to perform well at both low and high
>>> frequencies.
>>> @ 1.2 kW input in my center loaded mobile vertical the Lexan
>>> loading coil
>>> tube with internal helix groove where the coil wire is embedded
>>> works
>>> very
>>> well in mobile SSB service. I guess that sort of plastic could be
>>> used in
>>> tuners and amplifier
>>
>> Almost all "problems" with dielectrics come from use in capacitors or
>> insulation applications with concentrated electric fields in
>> high-impedance areas.
>> I can't understand why people seem to keep right on thinking a
>> dielectric
>> with a high dissipation factor at a certain frequency can't be
>> used as
>> insulation on that frequency.
>>
>> This was covered very well a few weeks ago.
>>
>> There is a lot more that goes into it than dissipation factor, as
>> a matter
>> of fact that often is one of things that doesn't even influences
>> dielectric selection.
>>
>> If I was building a solid dielectric transmission line or a
>> capacitor, I'd
>> worry about electrical characteristics. If I was building a coil
>> support
>> or insulating support posts, it would probably be one of the
>> things I
>> worried about the very least.
>>
>> 73
>> Tom
>>
>
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>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
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