FCC Rules & Regulations for Metal Detectors

[Michigan Badger]

Here are some questions I've asked about once a year since the days of Windows 3.1 and internet bulletin boards.

As I understand them, all metal detectors are basically transmitters and receivers.

Here it goes again and maybe someone this year can answer my questions.

1. Does the Federal Communications Commission regulate the output power of metal detectors?

2. Would increasing metal detector output power increase depth?

[DigEmAll]

The FCC regulates most all transmitters to 5 watts. You will only see a marginal gain by increasing the output because 5 watts is really getting close to the total possible output wattage, percentage wise. Wattage is rated on a scale as follows.

1 watt is 50% of the total possible output.
2 watts are 75%
3 watts are 87.5%
4 watts are 93.75%
5 watts are 96.875%

It is IMPOSSIBLE to ever have 100% because the gain in output decreases by 50% with every watt added.

So, at 5 watts you are already operating at almost 97%.

(Feel free to disagree guys.)

I believe that if you start messing with the guts on your machine, you are playing with fire! One, you kill any warrantee you have. Two, the more power you push through a machine the harder it has to work, thereby decreasing the useful life of the machine. And three, the more power you push, the more power it takes, killing the batteries that much sooner. My Garrett GTI 2500 is just as deep as any "tuned" machine that I have seen.

[Real de Tayopa Tropical Tramp]

DigEmAll
. My Garrett GTI 2500 is just as deep as any "tuned" machine that I have seen.
~~~~~
HOLA DIG

Being a Garrett man, and practally a compadre, automatically gives veracity to your statement, heheh.

Actually I would say that most of the detectorists would gain at least 50% in depth IF they really understood their machines..99% DON"T!!

This from long exerience and observation.

Till Eulenspiegle

[bakergeol]

Yes SWR is correct. This was covered on the tech forum(An amphlifer useage question). The following is a copy of what I posted. The first link is from Carl on the Geotech forum.


Don't worry about what is "legal" as there are NO FCC rules on the matter. See below. FCC power limitations on metal detectors are myths.
http://www.findmall.com/read.php?34,...816#msg-280816
Here is another link also
http://www.findmall.com/read.php?34,...819#msg-278819


George

[Michigan Badger]

Thanks much to all who have commented thus far.

I really never had in mind "tuning" a commercial machine. I was wondering what would happen if a detector were designed from the coil up for say 10 times the output power of the average commercial brands.

I was thinking of a much heavier coil gauge, far more wattage, and a belt mounted battery pack.

It seems to me that this should greatly increase depth but would probably cause other problems not the least of which would be weight.

However, there would be a special occasional use for a detector cabable of extreme depth and discrimination. Howbeit the weight factor would limit it's general convenience.

I'll bet such a machine wouldn't be popular at THing competitions--we're talkin major RF interference

[DigEmAll]

Notice I did say MOST all transmitters! LOL


George gave you the answer that is correct.

As far as a "Super Detector" goes. The machines that are currently able to use the "two box" attachments are already so deep that you wouldn't want to find anything with them unless you had machinery to dig with.