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
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|