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