Ok I have a Panasonic 2200 shortwave radio that has the ferrite rod
antenna on the top. Often I have to tell people that it is not a handle
dam it!

I once used it while driving from Florida to New York. As I got closer
heading north, I tune it to a strong NY station, and yes the signal got
stronger.

Now I understand what an trans-oceanic radio is. I am still looking for
information of the radio that C. Linberg used.

As a kid I use to take broken am transitor radios apart. Many of them
had a small ferrite rod inside. But I noticed that pocket radio (later
on known as walkman)did not have them.

Some ferrite rod look like a minature dipoles. Different tiny thead
wires coiled around. As a matter of fact I recently built a 90 feet per
side dipole coiled around pvc tubing, which is hollow. And I thought to
myself, what if I where to put a long iron pipe inside the top part of
the pvc tubing? -(looks like a T)

Also, thoughout the 1970's when big stereos became popular, (you know
the record player, 2 wooden speakers, radio with a long am/fm bandwith
with a cool red lighed niddle, silver face plate, solid state, 8track
and the girlfriend) many of them had an odd long plasic thing in the
back. It looked like something you would put your toothbrush in. LOL!

I would often say to myself: if that is an antenna, what a strange place
to put it!

As for LORAN, I think I hear the last of the LORAN signals while I was
in Florida. It was around 150 KHZ.

73 SR!

SR!

Brad wrote:

"SR" wrote in message
...

Ok so it was like a LORAN system.

SR



No, LORAN uses time measurement.

A Radio Direction Finder basically points in the direction of a LW or MW
radio station.
Have you ever used an old AM radio with a ferrite rod antenna inside? If you
turn the radio around the signal drops out if the end of the radio is
pointed toward the AM broadcast antenna.

Old direction finders used big circular crossed loops, now ones use a block
of ferrite with two windings on them at 90°.
With a combination of signals driving servo amplifiers, it is possible to
drive a device called a Goniometer to a null position, ie no signal, then
read off the bearing.
With a bit of practice, you can do the same thing with an old transistor
radio. BUT - they aren't very accurate. 4 or 5 degrees was considered
excellent. If you are trying to get a bearing on a distant station, be sure
you are using the groun wave, as the ky wave can distort and come in from
different angles.

Most modern aircraft carry an ADF receiver, but some are being removed in
favour of GPS.

Brad.