Fw: directional antenna

[MC Carpenter]

----- Original Message -----
From: "MC Carpenter" <[hidden email]>
To: "Bob W7AVK" <[hidden email]>
Sent: Saturday, November 27, 2004 3:04 PM
Subject: Re: [Elecraft] directional antenna

> yes you got it on the nose, I'm surprised so many people remember that
> stuff,  I had a directional radio finder on my first boat, I just found
> out that the beacons still exist all along the coast at almost all the
> inlets. plus we used  to home in on AM broadcasts like 1520 AM   or 670 AM
> on the dial. I have a short wave radio so I thought it would be fun to
> build a directional antenna.  But this ancient technology does not seem to
> have any "today's" directions. I went back to my oldest HAM BIBLE but its
> a 1987 so its not much help.   thanks Mike
>
>
> ----- Original Message -----
> From: "Bob W7AVK" <[hidden email]>
> To: "MC Carpenter" <[hidden email]>
> Sent: Saturday, November 27, 2004 1:02 PM
> Subject: Re: [Elecraft] directional antenna
>
>
>> MC - Not sure of your question.
>>
>> !]  Are you looking for information about the LF Beacons and the antennas
>> they used in the old days?
>>
>> They weren't directional, but got beams by phasing several verticals.
>> Also modulation techniques were used for the A and N ranges.
>>
>> 2]  Are you looking for data on how to build an antenna for DFing in the
>> LF band?
>>
>> For this one I'd suggest you google loop stick antenna or Ferrite Core
>> Antenna.  Like what were in the solid state raidos of old.
>>
>> Good luck,
>>
>> 73  Bob  W7AVK
>>
>>
>>
>> MC Carpenter wrote:
>>> does any one know where I can get the instructions for a good
>>> directional antenna for 150 to 281 kHz., code beacons used for air and
>>> marine.
>>> _______________________________________________
>>> Elecraft mailing list
>>> Post to: [hidden email]
>>> You must be a subscriber to post to the list.
>>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>> http://mailman.qth.net/mailman/listinfo/elecraft    Help:
>>> http://mailman.qth.net/subscribers.htm
>>> Elecraft web page: http://www.elecraft.com
>>>
>>
>>
>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft   
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Ron D'Eau Claire-2]

Plug "directional loop antenna" into your favorite search engine and stand
back. There are dozens, perhaps hundreds of web sites with design info on
the 'net.

Directional loops covering the 600 meter Marine Band were required equipment
on all ships until just recently. Can't tell you how many trips out I made
on a ship to turn circles and calibrate the loop after work had been done on
the ship - any movement of metal, etc., of any size would distort the
pattern.

What the DF loops were required for was to chase down a lifeboat if someone
was using a 600 meter lifeboat radio after a sinking. The DF loop was used
on occasion to check position where other services such as LORAN weren't
available, although since the 1980's GPS did a much better job all around.

They are gone from almost all vessels today. The 600 meter lifeboat radios
have been replaced by VHF radios and satellite systems that report the
lifeboat's exact position using GPS to all ships involved in a rescue. But
that's a change that's happened only in the past 5 years.

Ron AC7AC


_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft   
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com