There's no reason you can't make the inductor variable instead of the
capacitor -- as long as it has some way of making a variable tap. With
the method I described, you have to be able to adjust both the tank's
resonant frequency and the tap in order to assure getting a match.

Roy Lewallen, W7EL

Airy R. Bean wrote:

Presumably the roller coaster could be used for
a vari-tap, but then that means that the whole coil
will always be in circuit.

Time for a quikc .XLS for all bands.....

"Airy R. Bean" wrote in message
...
Presumably the roller coaster could be used for
a vari-tap, but then that means that the whole coil
will always be in circuit.


You've never seen a roller coaster I take it.

Presumably the roller coaster could be used for
a vari-tap, but then that means that the whole coil
will always be in circuit.


You've never seen a roller coaster I take it.

==================================

He just loves looking for problems where none exist.

On Sun, 29 Aug 2004 00:08:16 +0000 (UTC), "Reg Edwards"
wrote:


Presumably the roller coaster could be used for
a vari-tap, but then that means that the whole coil
will always be in circuit.


You've never seen a roller coaster I take it.

==================================

He just loves looking for problems where none exist.

Rollercoasters are hard to come by these days, aren't they, Reg? I
haven't seen one in 25 years or so now. :-(

--

"What is now proved was once only imagin'd." - William Blake, 1793.

Rollercoasters are hard to come by these days, aren't they, Reg? I
haven't seen one in 25 years or so now. :-(
===============================
Paul, From the above it is clear that you don't visit junk sales and flea
markets all that often ,if ever.

Roller coasters can be found ,be it at gradually increasing prices.
An amateur radio flea market 'pilgrimage' to continental Europe would
,no doubt, provide a good harvest.

In the UK , Birkett -Lincoln has them from time to time.

Frank GM0CSZ / KN6WH

For those of you who lack the necessary technical acumen
to qualify for a Ham Radio licence, the issue is two-fold....
A variable tapping point _TOGETHER WITH_ a variable inductance
require two independently variables, but the roller-coaster
provides you with only one.

"Reg Edwards" wrote in message
...
Presumably the roller coaster could be used for
a vari-tap, but then that means that the whole coil
will always be in circuit.
You've never seen a roller coaster I take it.
He just loves looking for problems where none exist.

At the Wimborne FRS rally, there were two identical
models on adjacent stands in the flea market. One was priced
at £15 and the other at £50 or £60 (I did comment on the
price contemporaneously, but now I've forgotten it because it
wasn't the one that I went for)

I suspect that with the CBisation of Ham Radio, especially here
in Britland with the M3/CB Fools' Licence, that more and more
of these will come on to the second hand market when increasing
numbers of CBers-Masquerading-As-Radio-Hams have no
idea what to do with them, what with their buy-in-a-box complete
stations with auto antennae tuners enclosed.

"Highland Ham" wrote in message
...
Rollercoasters are hard to come by these days, aren't they, Reg? I
haven't seen one in 25 years or so now. :-(
Paul, From the above it is clear that you don't visit junk sales and flea
markets all that often ,if ever.
Roller coasters can be found ,be it at gradually increasing prices.
An amateur radio flea market 'pilgrimage' to continental Europe would
,no doubt, provide a good harvest.
In the UK , Birkett -Lincoln has them from time to time.