[Mobile-Portable] Mobile antenna tuner questions

[MELVYN EVANS]

--- martin glazer <martinsglazer at yahoo.com> wrote:

> Good post. A Hustler resonator is $15 at a swap
> meet, while a screwdriver antenna can be much more $
> 
> Art Clemons <n8blk at aol.com> wrote:  Melvyn Evans:
> > In answer to your question, you would be better
> off
> > buying used Hustler mobile antenna's, they work as
> > well as any. It is essential that mobile antenna's
> are
> > self resonant at the chosen frequency,using a
> > stainless steel whip and a tuner would be an
> induced
> > resonancy, and would be a very poor antenna on
> every
> > band. Even the best mobile antenna's are so
> > inefficient that a 100 watts from the rig means
> that
> > on 20 metres only about 30 watts or less is being
> > radiated, and on 80 metres it amounts to about 1
> watt
> 
> First on 75 meters and 40 meters, a screwdriver
> radiates a great deal
> more than the equivalent Hustlers on the respective
> bands. 2nd, the
> operator apparently wanted an antenna that allowed
> changing frequency
> without getting out of the vehicle, something that
> one Hustler
> can't do. While the Hustlers are center-loaded
> antennas, the predicted
> Q of the individual coils on 40 and 75 is less if
> just because they're
> closer wound and narrower. On 75 meters according to
> W6AAQ, a
> screwdriver is about 9% efficient compared to about
> one percent
> efficiency for a base loaded whip or what W6AAQ
> calls a dummy load on a
> stick, the Hustler close wound coils.
> 
> You might want to test this for your self, take some
> level of signal
> like let's say 10 watts, feed it into a 75M Hustler,
> then feed the same
> signal into a Screwdriver and use a Field Strength
> Meter out of the near
> field to measure the strength (usually best done
> with another ham and an
> attenuation box for repeatable measurements).
> 
> Finally I used to use Hustler Resonators, I still
> own the lightweight
> 40, 20 and 10M resonators. I've actually performed
> the tests I suggest
> with 75 and 40M resonators vs. a screwdriver and a
> full size
> bugcatcher. There is a difference. 73 de n8blk/w3
> ----
> Your Moderator: Dick Flanagan K7VC,
> mobile-portable-owner at mailman.qth.net
> 
> ----
> Your Moderator: Dick Flanagan K7VC,
> mobile-portable-owner at mailman.qth.net
> 

Hello, 

This discussion seems to have moved a few paces. The
original writer was asking for advice about using a
tuner and a non resonant whip of some undetermined
length. My reply was that he would be better
purchasing a used Hustler antenna...... because he is
short of the old spondulacks. How the comparison of a
Hustler with a screwdriver antenna was added to the
discussion I do not 
know. I'm sure that he would be better off buying a
screwdriver,   but he cannot afford one so the
suggestion that he should have one is irrelevant, is
it not ? 

73,  G0GQK