Who is God?

"Generally" works "exactly"? You seem to be somewhat confused.

"Tim Wescott" wrote in message
...
Airy R. Bean wrote:
I can assure you that it is not. However, if it makes you feel
better then please deceive yourself on that matter as you undoubtedly
do upon the religious beliefs of DSP.
I will! Particularly since when _I_ build a system with DSP it
generally works exactly as I've predicted it will. If I'm deceived,
then so is God -- are you saying that God is deceived by how DSP works?

Is this kind of inductors still for sale or still build ? I would like to
buy two identical roller inductors of about 20 to 30 µH for an antenna
tuner. Does somebody know where I can buy them. In the US or in Europe, no
matter.
73 de ON5MJ - Jacques.
======================================
These roller inductors can often be found at ham flea markets . Residing in
Belgium you might have an opportunity to visit some of the many flea markets
in the Netherlands . There is a really big one in March every year at
Rosmalen near 's Hertogenbosch. Another one is the open air ham flea market
at the 'Lichtmis' trucker's stop between Zwolle and Meppel (last Saturday
of September).
I have seen roller inductors for sale at any ham flea market in NL ,also new
ones .

Good Luck

Frank GM0CSZ / KN6WH

An old-timer I used to know made his own from plastic drain pipe. He used
a
lathe for cutting a spiral grove in the pipe for the wire, and machined
most
of the other parts himself.
=========================
Before using drain pipe check it for RF integrity in the microwave oven. The
grey stuff seems to have metal containing pigment.
The white stuff might be better .....suggest you always check.

Another possibility might be a polystyrene cylinder in the shape of a liquid
volume measuring gauge as used by photographers in the dark room .
I have such a gauge made by JOBO - Germany , volume 500 milli-litre
,diameter 65 mm ( approx 2.6 inch), length 200 mm (8 inch).

Frank GM0CSZ / KN6WH

To do this I would use a 'blast from the past', a variometer.
This consists of two coils, one fixed and one rotating inside
the fixed coil. If both are the same inductance (so the outer
one is would with wider spacing than the inner) when they are
in "series aiding" the total inductance will be the sum, plus
the mutal inductance. When they are series opposing, the total
inductance will approace zero. (over simplifcation).
Variometers have NO moving contacts so they are easier to build
than rotary coils. They can't be made as large in inductance
without avoiding other problems (large distributed capacitance),
but a small variometer in series with a multitapped coil is a
good compromise.
========================
Don't know the US situation ,but in Europe the marine 2 MHz band (in
particular 2182 kHz emergency channel) is no longer used, with most ships
now having satellite comms.
All that redundent equipment is now being dumped or made available via the
surplus trade . They all have variometers. However these variometers are
probably only usable up to 10 MHz.
Recently I was given a low power life boat emergency transceiver made by
SKANTI (Danemark) for operation on 2182 and 8863 ? khz ,fitted in a water
proof enclosure ............beautiful components including a variometer.
Skanti also made the wellknown Sailor marine radio ( painted green).

Frank GM0CSZ / KN6WH

In my case I can't have a look into the tuner or handle alligator clips as
the tuner must be remotable and outdoors. The shack will be soon located
in
the cellar and it will not be possible to pass the ladder line through the
house. A coax would be rather acceptable indoors. So I am looking for a
good
solution for the inductors: roller inductors, tapped inductors, tapped
inductors with small variable serie capacitors. Driven by servos or
stepper
motors. Maybe I don't need a fine tuning of the inductors because of the
main variable capacitor could be enough.
==========================================
Provided there is not too much metal around you can readily pass a balanced
feeder 75 -300 or 450 Ohms ribbon through the house.
I use a 'Doublet' 2x 21 metres with a balanced 450 Ohms ribbon feeder
running into and over the loft and so into the ground floor shack with a
balanced to unbalanced matching unit in the shack next to the transceiver .
No RF(I) problems ! Max RF power 100W-PEP

Frank GM0CSZ / KN6WH

To do this I would use a 'blast from the past', a variometer.
This consists of two coils, one fixed and one rotating inside
the fixed coil. If both are the same inductance (so the outer
one is would with wider spacing than the inner) when they are
in "series aiding" the total inductance will be the sum, plus
the mutal inductance. When they are series opposing, the total
inductance will approace zero. (over simplifcation).
Variometers have NO moving contacts so they are easier to build
than rotary coils. They can't be made as large in inductance
without avoiding other problems (large distributed capacitance),
but a small variometer in series with a multitapped coil is a
good compromise.
========================

There's a serious shortcoming with variometers for transmitting purposes.

As the inductance reduces the wire resistance remains constant.

Result - extremely low Q for small inductances.

----
Reg, G4FGQ

Now I will try to find 4 stepper motors. I also got very good ideas from
Bob (anonymous) about the
use and control of stepper motors.
===================
Good stepper motors for your job would be found in 'ancient' 8 inch floppy
drives or the larger Hard Drives .

Frank GM0CSZ / KN6WH