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Does F4 have pre-set GB in disc mode

T

TG77

New member
Can someone answer this question for me? I'm having a hard time finding a rock-solid answer. It shouldn't be this hard. The Fisher F4 manual really isn't much help unless you're real good at reading between the lines. I much prefer a straight out answer.

My question is this. Does the Fisher F4 have adjustable Ground Balance in disc mode or it factory pre-set?
 
I also asked Fisher directly when I first started using the F4 and this is what they said.

Quote:
After ground-balancing in AutoTune mode, the setting carries over into
all other modes. The same knob setting remains current even if the
detector is powered off and back on again. We do however, recommend
checking and, if necessary, readjusting the GB setting each time you use
the detector, as the knob may have been bumped. Ground conditions also
change from area to area, so periodically checking the GB setting in
autotune will guarantee optimal calibration at all times.


Which confused me even more, so 99% of the time I just leave the nob in the preset position when I use any Disc mode. The other 1% of the time I will use the Quick GB method and then swithc to disc mode but moving the nob does not seem to affect anything in disc mode. Hope this is clear as mud now :) Good Luck
 
Disc mode is factory set. The GB adjustment only works on the all metal auto tune mode. It took me a few weeks to get the correct answer myself.
 
When I read the manual it did not mention the GB was for the disc mode. It does say that it effects the all metal auto tune mode. So I wrote fisher and asked. I also asked Andy at www.fisherf75.com Both answers as I suspected were the GB does not effect the disc mode. The disc GB is factory set. So that's all I know.
 
You can have detectors where the GB can adjust just the true all metal mode or just the disc mode or both. It took me 2 weeks to get a clear answer. Email Dave Johnson at Fisher and ask these specific questions. To me - I don't know why it doesn't control both. I would have tried an F4 if that was the case. Since the F4's and F2's Disc GB are factory set I chose to buy and try an F2 and saved some money. Since to me they should work the same in the disc mode. I don't hunt in true all metal anyway.
 
Tinfoil,
When I downloaded the F4 manual it said nothing about the disc. GB being adjustable. But it did say that the GB is adjustable in the all metal auto tune mode. This stuck out to me because why wouldn't they say it adjusts both if it did? That would be a huge selling point for me and others. So off to the forums I went for my answer. After 2 weeks of no responses I wrote Fisher. It took about 4 days to get a response. Also Mr. Bill confirmed it too. There is nothing in the manual that says the GB adjustment transfers to the disc mode. Let me know what you find out?
 
The say the Lobo Super Track, Cortes, 1270 and the Gold Bug ll is like that. I will let you know what I find out. That is the reason I don"t have any of those machines. HH Later Jerry aka Tinfoil
 
discrimination mode.

The Cortes have a fixed GB in discrimination, and one reason is because changing the GB in disc. would alter the display reading accuracy.

The F4 & F2 is fixed in disc. mode. All one has to do is adjust the GB out of whack, and see what affect it has in the disc. mode.
 
The GB adjustment affects all searching modes.

It is not like this on all Fishers. The 1200 series is fixed in disc. mode, (I spend enough time adjusting 1270's lately).

The ID Excel, ID Edge, and the CoinStrike, completely different circuit, GB on both modes.
 
When I e-mailed this is the response I got from Fisher Labs.


On the F4, in the motion discrimination/ID mode, the ground balance is factory preset, as it is on most discriminators. The factory preset is not to "average ground" as is often supposed, but rather it's set so that between that and the discriminator, all ground can be bracketed and rejected.

Some of our products do carry the ground balance setting over to the discriminator, so we're familiar with both methods. Each method has its own advantages and disadvantages, so no matter how we do it, some customers will wish we'd done it the other way.

For many years (since early 1980's) preset ground balance has often been described as "automatic" or even "tracking" because ground is cancelled without intervention by the user and because the inverting differentiator circuits customarily used in such machines do track and cancel most of the ground signal regardless of phase. This is of course not the same thing as the more recent (1990's) "automatic" or "tracking" systems which usually comprise a phase-sensitive servo system that does electronically more or less the same thing that a human would do with a ground balance knob. In order to avoid this confusion the industry seems to be moving toward simply calling preset "preset" or not calling it anything, since here we are 25 years later and it is no longer regarded as a novelty.

--Dave Johnson[/i]
 
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