Is it possible to have a radio that when the signal comes in, it can
tell you which dirrection it's from?????????????????????????????????

SR!

Greg wrote:


From: SR
Organization: Posted via Supernews, http://www.supernews.com
Reply-To:
Newsgroups: rec.radio.shortwave
Date: Sat, 01 Oct 2005 15:19:31 -0400
Subject: WW2 Radio Compass

As you know I am mad about radios, WW2 airplanes, tanks & subs.

I was thinking about getting a compass so that I could better find my
possition at home. So I did a search on Ebay on Compass. I then came
accoss something that is called a Radio Compass.
EBAY Item number: 6565758752

My guess it that the gauge is telling the pilot his dirrection in the
sky. But why is it called a radio compass?

Is the device putting out a signal? And is the signal bouncing back?

73 SR!

No, it's a radio receiver with a directional antenna. The display shows the
compass bearing to the radio station being received. There used to be
portable radios, usually the "all band" variety, that had built-in radio
direction finders (RDF's). Heathkit even had one, though I don't recall the
model number.

Greg

"SR" wrote in message
...
Is it possible to have a radio that when the signal comes in, it can tell
you which dirrection it's from?????????????????????????????????

SR!

Yes. BUT. The DF principles I have described do not work effectively above
MW. Ferrite antennas are less effective. The thin wire you described it
called Litz wire. Also remember that point I made about skywave signals
coming in from different directions to groundwave. Very nasty errors occur
at dusk and dawn due to diurnal shift.

The alternative is to have a log periodic or perhaps a StepIR tunable,
turnable array.

Brad.

"SR" wrote in message
...
Here is another odd item I found. I can not seem to figure out how CW
works with this:

SOLID BRASS NAUTICAL SHIPS ENGINE TELEGRAPH Ebay Item number: 7353388466
SR

It's a telegraph, not telegraphy. It simply repeats the commands Ahead,
Astern , Stop etc.

Brad.

SR wrote:
Is it possible to have a radio that when the signal comes in, it can
tell you which dirrection it's from?????????????????????????????????


Yes.

SR wrote:
Is it possible to have a radio that when the signal comes in, it can
tell you which dirrection it's from?????????????????????????????????


Yes. VOR does that.



SR!

Greg wrote:


From: SR
Organization: Posted via Supernews, http://www.supernews.com
Reply-To:
Newsgroups: rec.radio.shortwave
Date: Sat, 01 Oct 2005 15:19:31 -0400
Subject: WW2 Radio Compass

As you know I am mad about radios, WW2 airplanes, tanks & subs.

I was thinking about getting a compass so that I could better find my
possition at home. So I did a search on Ebay on Compass. I then came
accoss something that is called a Radio Compass.
EBAY Item number: 6565758752

My guess it that the gauge is telling the pilot his dirrection in the
sky. But why is it called a radio compass?

Is the device putting out a signal? And is the signal bouncing back?

73 SR!


No, it's a radio receiver with a directional antenna. The display
shows the
compass bearing to the radio station being received. There used to be
portable radios, usually the "all band" variety, that had built-in radio
direction finders (RDF's). Heathkit even had one, though I don't
recall the
model number.

Greg

.... radio tracking
device underneath the tanker so the coppers can trace the truck....

That's "White Heat," a 1949 movie starring Jimy Cagney.

http://www.imdb.com/title/tt0042041/

"Made it, ma; top of the world."

Cmdr Buzz Corey wrote:
SR wrote:
Is it possible to have a radio that when the signal comes in, it can
tell you which dirrection it's from?????????????????????????????????

Yes.

ITYM Yes!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!

--
If John McCain gets the 2008 Republican Presidential nomination,
my vote for President will be a write-in for Jiang Zemin.

Cmdr Buzz Corey wrote:

SR wrote:
Is it possible to have a radio that when the signal comes in, it can
tell you which dirrection it's from?????????????????????????????????


Yes.

ADF works well in aircraft for LF and MF
VOR works for VHF
TACAN works for UHF
and some military aircraft carry UHF DF
Plus, of course, ECM systems work throughout the spectrum.

Dave
Who has used them all, but long ago!

"Dave Holford" wrote in message
...


Cmdr Buzz Corey wrote:

SR wrote:
Is it possible to have a radio that when the signal comes in, it can
tell you which dirrection it's from?????????????????????????????????


Yes.

ADF works well in aircraft for LF and MF
VOR works for VHF
TACAN works for UHF
and some military aircraft carry UHF DF
Plus, of course, ECM systems work throughout the spectrum.

Dave
Who has used them all, but long ago!

I am reading his question for the point of view of DF'ing ANY radio signal
in an effort to gain knowledge of it's possible source.

VOR is a deliberately phase modulated signal, as is TACAN. Not much point
DF'ing them from a ground station since their location is known, or can be
found from the Ident. Now UHF DF certainly has some applications,
particularly if DX'ing FM broadcast stations, but so would a yagi and a
rotator.

Since the newsgroup is r.r.shortwave, then DF'ing shortwave seems to me to
be the topic. Here is another method worth trying, particularly because of
it's compact size. http://www.qsl.net/dj3tz/loop1.html

Brad.

Yep,White Heat.A durn fine Humphrey Bogart movie and Sahara,, two of my
favorite Humphrey Bogart movies.
Thirty Seconds Over Tokio movie and a bunch of other durn fine movies
start on tv this Thursday.Nosferatu movie is fixin to start on the TCM
channel now.
cuhulin