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Offline mikebgTopic starter
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« on: July 06, 2010, 11:23:29 pm »
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The program in this site has combined two my postings in the topic "Discriminating BFO detector" despite that time difference between them is one week (7 days). The first posting was sent by me in 07-01-2010. The second one (starting with word "Cornelius") was sent on 07-07-2010. The second one had title "Re: Motion BFO detector" and that title was set by the program for both postings.
To avoid such program intervencies I start here new topic with necessary title.
The attached figure shows the blocks inside PLL IC CD4046 and principle of their connections.
Here is some information about the author of Motion BFO detector:
Raymond (Ray) Charles Vincent Macario studied radio physics at King's College, London, where his studies of complex radio waves propagating in very varied conditions - using a unique contiguous spectum analyser - stood him in good stead in the embryionic mobile radio industry. He spent several years in industry designing radio-frequency and other circuits before accepting a lectureship post in communications in the Department of Electrical and Electronic Engineering at the University of Wales, Swansea. There he has had the opportunity to manage a hundred or more undergraduate and postgraduate projects in the radio business. He had lectured and given courses on mobile radio in most parts of the world.
He designed the first Motion BFO detector in 1978.

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Offline Homefire
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« Reply #1 on: July 06, 2010, 11:37:42 pm »
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Confused I am!  A BFO is motion orientated to begin with.

Motion and Induction is how they work.

Huh???



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Offline mikebgTopic starter
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« Reply #2 on: July 07, 2010, 07:41:18 am »
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Quote:Posted by homefire
Confused I am!  A BFO is motion orientated to begin with.

Motion and Induction is how they work.Huh???

Homefire, excuse me that I use a bad term "Motion Metal Detector", but it is not discovered by me. It is used by experts in this art to describe the mode of operation when the search coil should be in motion in order device to respont to target.
In non-motion search mode, the detector continues to respond when the coil stops above the target. This is important at pinpointing when the coil is moved slowly.
In  motion mode, the audio signal slowly decays to zero or to threshold tone when the coil stops above the target.
The correct term is "Dynamic Metal Detector" but this term is used rarely.
An another term used more frequently for the same is SAT (Self Adjusting Threshold).
Yours Mike-BG

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