Air Cells were popular in the thirties when people who could
afford a radio lived out where there was no electricity. Acorn
tubes?? You are a newbie...I would not use selsyns, but
instead a sine/cosine array say of four verticals..I did a large
amount of countermeasures around the world..Active and passive..
and really came up with one of the first ways to determine the
range of an unknown signal..My favorite circuit would be a piece
of galena with a needle to find a good spot, an oatmeal box with
wire wrapped around it..a condenser made from Bugler tinfoil,
and a borrowed telephone receiver all inside a cigar box..Later
one with a transistor powered by rectified RF from the local
station in town. FYI in the twenties "peanut" tubes along with
O1A's existed along with type 27 detectors..etc.. I..._._
"Jeff Liebermann" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On Tue, 12 Aug 2008 12:20:06 -0700, "Gator" <(E-Mail Removed)>
> wrote:
>
>>The Oracle has spoken..Thanks much..
>
> I can't affort Oracle. I use MySQL instead.
>
>>At eighty-five winters I have
>>long experience with "microwave." I remember rhumbatrons, klystrons,
>>maggies etc..
>
> Egads. That does go back. Don't forget the goniometer, gyrotron, BWO
> (backward wave oscillator), leecher wires, TWT (travelling wave tube),
> Gunn diodes oscillators, tunnel diode oscillators, 1N21 diodes, gas
> tube t/r switches, echo boxes, and a wide variety of antennas that
> defy aethetic considerations. If you know what all these are, you're
> either very old, very experienced, or both.
>
>>I can remember when thirty mega-"cycles" was hard to
>>get.
>
> I switched from megacycles to megahertz in about 1980. However, I
> still use uuF instead of pF for cazapitors.
>
>>Turn the tubes upside-down, pull off the base etc..
>
> Parasitic oscillations? My favorite were acorn tubes. The would work
> no matter how badly I messed up the construction.
>
>>I even remember
>>goniometers, crystal dectors, air-cell batteries.
>
> Ok, you got me on the air-cell battery. Whazzat and where's it used?
>
>>Have sat hi-speed CW
>>circuits using "Z" signals, i.e., ZLF ?? Have had about eight
>>calls..Presently
>>W6BWY..an OA, KX, etc..I admire the h... out of your background.
>
> Got my novice license in about 1963 at age 14. I survived building an
> AC-DC 5 tube radio without getting electrocuted. Everything since
> then has been relatively safe and easy.
>
>>My
>>idea of a locator would be dual rotating antennas (phased) synced with
>>a display of some sort.
>
> Yep. It's also a common technique used by T-hunters in various
> places. 73 Magazine had a series of articles in the Homing-In section
> on the luantic in Santa Barbara, what butchered a perfectly good
> Konel/Furuno marine radar, mounted it on his trash mobile, and
> replaced the dish with a 2 meter 5 element quad-yagi. The rotation of
> the antenna was synchronized with a pair of selsyns to give a circular
> PPI-like display. Nifty idea but more easily implimented using a
> shaft encoder and computah software. (Yet another project).
>
>>The problem with finders is that 2.4 Gigs bounces
>>all over the place and is hard to pin down..
>
> Yep. There are other problems. 2.4 GHz is so crowded, that it's
> going to be difficult seperating xmitters. The best antenna for the
> purpose would be a 24dBi barbeque grill dish, which has a -3dB
> beamwidth of about 7 degrees. That means it can resolve two xmitters
> seperated by more than 7 degrees. Any less, and they combine into a
> common blur. 360 degrees divided by 7 degrees is about 50 stations.
> Netstumbler now finds 20 stations here. Double that to add in the
> clients as Netstumbler only finds access points. So, chances are good
> that you'll see nothing but stations, at any compass point, and not be
> able to resolve or identify a single one.
>
> Remember Dr. R.V. Jones and the Wizard War?
> <http://en.wikipedia.org/wiki/Reginald_Victor_Jones>
> One of the German beam following systems he reverse engineered used a
> pair of moderately narrow antenna patterns, switched back and forth at
> a regular rate.
> <http://en.wikipedia.org/wiki/Knickebein_(navigation)>
> <http://en.wikipedia.org/wiki/Lorenz_beam>
> I think I can use the same method to obtain a rather narrow beam width
> for a rotating antenna RDF. (Yet another project).
>
>>Many years ago in
>>countermeasures
>>we had antennas on each side of our wings and in those days rudimentary
>>rotating and supplying signals to amps and indicators, etc.
>
> Been there. I help on the AN/SRD-21 "homer". Two antennas and an RF
> switch. Synchronous demodulator driving a zero center meter. The
> Coast Guard vessel goes in circles until the meter centers. I dug the
> design out of an aviation electronics book from the 1930's.
>
>>Hawking had one
>>detector which had some directional ability,,but nothing worth while.
>
> It's all a matter of beam width. The narrower the better. There's
> nothing that can be build that's sufficiently narrow, and will also
> fit in your pocket.
>
> Instead of the traditional dish, it might be possible to use a
> Franklin or AMOS antenna:
> <http://yu1aw.ba-karlsruhe.de/vhf_ant.htm>
> Lots of gain (12-18dBi), 6 degrees vertical beamwidth, 90-120 degrees
> horizontal beamwidth. Rotate the antenna 90 degress and spin it
> around. The 6 degree beamwidth should be as good as a dish and much
> smaller.
>
>>73s
>>W6BWY
>
> Thanks much...
>
> --
> # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
> # 831-336-2558 (E-Mail Removed)
> # http://802.11junk.com (E-Mail Removed)
> # http://www.LearnByDestroying.com AE6KS
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