Subj : Antenna
To   : ROY J. TELLASON
From : WAYNE CHIRNSIDE
Date : Fri Jul 08 2005 06:19 am

->  MR> "TOM WALKER" bravely wrote to "WAYNE CHIRNSIDE" (06 Jul 05 
->  MR> 07:06:00)  --- on the heady topic of "Re: Antenna"

->  WC>->  They why do Battery Radios work so well?

->  WC>Because they have a balanced antenna, you know those ferrite type
->  WC>things with the windings on them.


->  TW> We are talking about a VHF Weather Radio. you cannot use a Ferrite
->  TW> antenna at frequnecies that high.
->  TW> Actualy though the RF ground is really of most importance with
->  TW> Transmiters.

->  MR> IIRC before the advent of digital synthesized tuners in car radios,
->  MR> tuning was done using inductive coils into which a ferrite piston
->  MR> would be inserted or extracted, instead of the usual tuning
->  MR> capacitor. 

-> I've only ever seen that in car radios,  myself.

I've seen them, along with "vibrators" to step up voltage
for tubes.

OTOH my Cub Scout Crystal radio had an inductor wound on
a Quaker Oats box with a slider for tuning.

The capacitor was fixed and made from the genuine tin foil
once found on gum wrappers you could peel off the paper backing.
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