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Gold Prospecting
Metal Detecting for Gold
Converted wired headphones to Bluetooth/Wireless - todays project
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<blockquote data-quote="Mike Harding" data-source="post: 371107" data-attributes="member: 11269"><p>It would be wise to check whether the Bluetooth module is reducing the sensitivity of the detector's receiver.</p><p></p><p>A metal detector is, essentially, a combined radio transmitter and receiver and all radio receivers have a minimum level of signal they can receive - just like our ears. If the receiver is already receiving a signal at level x then any signals below the level of x will not be correctly received and, at best, will be passed through the receiver in a garbled fashion.</p><p></p><p>The Bluetooth transmitter is the source of two types of radio signal;</p><p>1 - the Bluetooth transmission at around 2.4GHz</p><p>2 - the spurious transmissions from the electronics in the Bluetooth module.</p><p></p><p>Either, both or a mixing of the two could be producing signals which desensitise the detector's receiver and there is no easy way to tell.</p><p></p><p>The only way I can suggest is (using normal headphones) with a tiny piece of gold (lead if no gold) swing the detector at an increasing height over the target until just the *smallest* signal is produced - a signal you can barely hear. Next switch to the Bluetooth setup and repeat the test. If you can still hear the target all is good.</p><p></p><p>PS. Turn your mobile phone off (remove the battery?) when detecting for the same reasons as above.</p></blockquote><p></p>
[QUOTE="Mike Harding, post: 371107, member: 11269"] It would be wise to check whether the Bluetooth module is reducing the sensitivity of the detector's receiver. A metal detector is, essentially, a combined radio transmitter and receiver and all radio receivers have a minimum level of signal they can receive - just like our ears. If the receiver is already receiving a signal at level x then any signals below the level of x will not be correctly received and, at best, will be passed through the receiver in a garbled fashion. The Bluetooth transmitter is the source of two types of radio signal; 1 - the Bluetooth transmission at around 2.4GHz 2 - the spurious transmissions from the electronics in the Bluetooth module. Either, both or a mixing of the two could be producing signals which desensitise the detector's receiver and there is no easy way to tell. The only way I can suggest is (using normal headphones) with a tiny piece of gold (lead if no gold) swing the detector at an increasing height over the target until just the *smallest* signal is produced - a signal you can barely hear. Next switch to the Bluetooth setup and repeat the test. If you can still hear the target all is good. PS. Turn your mobile phone off (remove the battery?) when detecting for the same reasons as above. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
Converted wired headphones to Bluetooth/Wireless - todays project
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