BFO TYPE LOCATOR

[gold24h]

I have built a bfo and radio pistol type locator,the bfo has an external coil about five inches around with seventy turns of wire,around the edge of coil not touching the wires in the coil i have a 1/8 diameter aluminum rod that is connected by a cable to the antanna of an am fm raido,the question is how do i tune the bfo,do i tune it to null not making any sound in the speaker or do i tune it just like a bfo metal detector,just past the null point making a tone.Another question,the radio,it will pick up the bfo tone any place i tune the radio any channel,am or fm.Am has a lot of blank channels but fm is almost full of stations,could somebody give there advice on how to set this type of locator up.

[Qiaozhi]

Originally Posted by gold24h

I have built a bfo and radio pistol type locator,the bfo has an external coil about five inches around with seventy turns of wire,around the edge of coil not touching the wires in the coil i have a 1/8 diameter aluminum rod that is connected by a cable to the antanna of an am fm raido,the question is how do i tune the bfo,do i tune it to null not making any sound in the speaker or do i tune it just like a bfo metal detector,just past the null point making a tone.Another question,the radio,it will pick up the bfo tone any place i tune the radio any channel,am or fm.Am has a lot of blank channels but fm is almost full of stations,could somebody give there advice on how to set this type of locator up.

OK - here's what you need to do:

Grip the device between your thumb and forefinger, and hold it out at arm's length. Then position yourself over the trash can ..... and release.

Sorry - couldn't resist it!

[Ernie]

This should be placed in another forum as it is a technical question.

[Morgan]

Originally Posted by gold24h

I have built a bfo and radio pistol type locator,the bfo has an external coil about five inches around with seventy turns of wire,around the edge of coil not touching the wires in the coil i have a 1/8 diameter aluminum rod that is connected by a cable to the antanna of an am fm raido,the question is how do i tune the bfo,do i tune it to null not making any sound in the speaker or do i tune it just like a bfo metal detector,just past the null point making a tone.Another question,the radio,it will pick up the bfo tone any place i tune the radio any channel,am or fm.Am has a lot of blank channels but fm is almost full of stations,could somebody give there advice on how to set this type of locator up.

And what is this type of BFO locator,its LRL type ?

[detectoman]

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