They are a tuned resonant circuit the same as a box loop. Half of that
resonant circuit is in the radio. Due to differences in the circuitry, there
is hardly a way to just say "take a ferrite rod and wind X number of turns
on it". I could tell you how to do it, including the math necessary, if you
really want to get that deep. If not, and you just want performance, build a
box loop. Lots easier and plans are readily available.


"
You're too far ahead of me RHF. I haven't a clue as to how they work.
All I
wanted to do was just make one 2 times as big as on in a junk radio to see
if I
can get stations better based on size of antenna. At this point, I can't
find a
website that even explains windings etc.

elfa wrote in :

You're too far ahead of me RHF. I haven't a clue as to how they work.
All I wanted to do was just make one 2 times as big as on in a junk
radio to see if I can get stations better based on size of antenna.
At this point, I can't find a website that even explains windings etc.


My God, can't anybody do anything any more without having to consort with
the Internet and get permission from the Netizens?

You wind some wire on a ferrite bar. You put a variable capacitor across it
and see how it tunes. You adjust the windings until you get what you are
looking for.

Do you need toilet training instructions, as well?

You should look at:
http://www.st-andrews.ac.uk/~www_pa/...rt7/page5.html
(many simple schematics for buling crystal radios are also avaible over WWW pages)

elfa wrote:

I want to try to make a homemade ferrite antenna to improve the AM reception on
an old radio. I can't find any place on the internet that gives a simple
explanation of the how to's. All I want to know is how many winds of copper
wire and what lead connects to what radio connection. And also, just the most
basic of antenna principals involved.

Anyone have any suggestions?

thanks

elfa

Looked this over; utterly worthless without advanced math skills;

- Good for those what got em !



Subject: Homemade AM ferrite antenna question
From: Igor Gros
Date: 11/4/2003 3:05 AM Eastern Standard Time
Message-id:

You should look at:
http://www.st-andrews.ac.uk/~www_pa/...rt7/page5.html
(many simple schematics for buling crystal radios are also avaible over WWW
pages)

elfa wrote:

I want to try to make a homemade ferrite antenna to improve the AM
reception on
an old radio. I can't find any place on the internet that gives a simple
explanation of the how to's. All I want to know is how many winds of
copper
wire and what lead connects to what radio connection. And also, just the
most
basic of antenna principals involved.

Anyone have any suggestions?

thanks

elfa

Try 40 turns of wirewrap wire on the following ferrite:

http://cgi.ebay.com/ws/eBayISAPI.dll...m=30573159 10

I measure 147uH which will put you in the center of the MW band with a 150
pF cap. This means that you can use the standard 10 - 356 pF variable cap.

Happy winding,

/Dave



"Soames123" wrote in message
...
Looked this over; utterly worthless without advanced math skills;

- Good for those what got em !



Subject: Homemade AM ferrite antenna question
From: Igor Gros
Date: 11/4/2003 3:05 AM Eastern Standard Time
Message-id:

You should look at:
http://www.st-andrews.ac.uk/~www_pa/...rt7/page5.html
(many simple schematics for buling crystal radios are also avaible over
WWW
pages)

elfa wrote:

I want to try to make a homemade ferrite antenna to improve the AM
reception on
an old radio. I can't find any place on the internet that gives a
simple
explanation of the how to's. All I want to know is how many winds of
copper
wire and what lead connects to what radio connection. And also, just
the
most
basic of antenna principals involved.

Anyone have any suggestions?

thanks

elfa

Try 40 turns of wirewrap wire on the following ferrite:

http://cgi.ebay.com/ws/eBayISAPI.dll...m=30573159 10

I measure 147uH which will put you in the center of the MW band with a 150
pF cap. This means that you can use the standard 10 - 356 pF variable cap.

Happy winding,

/Dave



"Soames123" wrote in message
...
Looked this over; utterly worthless without advanced math skills;

- Good for those what got em !



Subject: Homemade AM ferrite antenna question
From: Igor Gros
Date: 11/4/2003 3:05 AM Eastern Standard Time
Message-id:

You should look at:
http://www.st-andrews.ac.uk/~www_pa/...rt7/page5.html
(many simple schematics for buling crystal radios are also avaible over
WWW
pages)

elfa wrote:

I want to try to make a homemade ferrite antenna to improve the AM
reception on
an old radio. I can't find any place on the internet that gives a
simple
explanation of the how to's. All I want to know is how many winds of
copper
wire and what lead connects to what radio connection. And also, just
the
most
basic of antenna principals involved.

Anyone have any suggestions?

thanks

elfa

Try 40 turns of wirewrap wire on the following ferrite:

http://cgi.ebay.com/ws/eBayISAPI.dll...m=30573159 10

I measure 147uH which will put you in the center of the MW band with a 150
pF cap. This means that you can use the standard 10 - 356 pF variable cap.

Happy winding,

/Dave



"Soames123" wrote in message
...
Looked this over; utterly worthless without advanced math skills;

- Good for those what got em !



Subject: Homemade AM ferrite antenna question
From: Igor Gros
Date: 11/4/2003 3:05 AM Eastern Standard Time
Message-id:

You should look at:
http://www.st-andrews.ac.uk/~www_pa/...rt7/page5.html
(many simple schematics for buling crystal radios are also avaible over
WWW
pages)

elfa wrote:

I want to try to make a homemade ferrite antenna to improve the AM
reception on
an old radio. I can't find any place on the internet that gives a
simple
explanation of the how to's. All I want to know is how many winds of
copper
wire and what lead connects to what radio connection. And also, just
the
most
basic of antenna principals involved.

Anyone have any suggestions?

thanks

elfa

Try 40 turns of wirewrap wire on the following ferrite:

http://cgi.ebay.com/ws/eBayISAPI.dll...m=30573159 10

I measure 147uH which will put you in the center of the MW band with a 150
pF cap. This means that you can use the standard 10 - 356 pF variable cap.

Happy winding,

/Dave



"Soames123" wrote in message
...
Looked this over; utterly worthless without advanced math skills;

- Good for those what got em !



Subject: Homemade AM ferrite antenna question
From: Igor Gros
Date: 11/4/2003 3:05 AM Eastern Standard Time
Message-id:

You should look at:
http://www.st-andrews.ac.uk/~www_pa/...rt7/page5.html
(many simple schematics for buling crystal radios are also avaible over
WWW
pages)

elfa wrote:

I want to try to make a homemade ferrite antenna to improve the AM
reception on
an old radio. I can't find any place on the internet that gives a
simple
explanation of the how to's. All I want to know is how many winds of
copper
wire and what lead connects to what radio connection. And also, just
the
most
basic of antenna principals involved.

Anyone have any suggestions?

thanks

elfa