Re: [IRCA] An ignorant question about BOGs

["CHARLES HUTTON" <charlesh3@xxxxxxx>]

A 43 is OK, but a 73 is better.

In particular, the "binocular" style of the 73 core is the best. See 
http://w8ji.com/core_selection.htm for lots of nice pictures and 
explanations and graphs. This is the best web page about building matching 
transformers that I know.

The turns ratio below is right for an elevated beverage but for a BOG it 
would be better to drop the turns ratio down to something around 2 to 2.5. 
It won't blow your socks off with the difference, but there's no sense to 
throwing away a dB or 2.


Chuck


>From: mwdxer@xxxxxxxxx (Patrick Martin)
>Reply-To: Mailing list for the International Radio Club of 
>America<irca@xxxxxxxxxxxxxxxx>
>To: irca@xxxxxxxxxxxxxxxx (Mailing list for the International Radio Club 
>ofAmerica)
>Subject: Re: [IRCA] An ignorant question about BOGs
>Date: Fri, 24 Mar 2006 15:18:13 -0800
>
>Ron,
>
>There are companies that sell the torrids to wrap your own matching
>transformer. They are very inexpensive. I don't have a link to the
>directions on wrapping your own, but you can type in "matching
>transformer" into Google and find into. Plus I think Mark has some info
>on his site as I remember. The FT43 transformer (I think the number is),
>has 35 wraps on the primary and 11 on the secondary. That gives you a
>pretty decent match. I just solder banana plugs on the end of the RG6
>and the female banana jack on the box. It works very easily. You can
>build the little transformer in a plastic pill bottle, a box frfom Radio
>Shack. I use plastic and they work fine.
>
>73,
>
>Patrick
>
>Patrick Martin
>
>Come to Seaside Oregon for the 2006 IRCA Convention! It will be held at
>the Comfort Inn on September 22-24,2006.
>
>_______________________________________________
>IRCA mailing list
>IRCA@xxxxxxxxxxxxxxxx
>http://arizona.hard-core-dx.com/mailman/listinfo/irca
>
>Opinions expressed in messages on this mailing list are those of the 
>original contributors and do not necessarily reflect the opinion of the 
>IRCA, its editors, publishing staff, or officers
>
>For more information: http://www.ircaonline.org
>
>To Post a message: irca@xxxxxxxxxxxxxxxx
>


_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://arizona.hard-core-dx.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx