SD2200/GP/GPX Frequency Tweak

With the SD2200/GP Models we have a few tweaks also to get the buggers chirping along, they don't
have manual frequency tune settings but we can still fiddle and tweak that part up a bit by
using the Auto-tune button combined with the power on/off switch.

Now, most older operators know about high frequency VLF detectors and the way they are RED HOT on
small gold slithers, and Lower frequencies are better at penetrating deeper for larger gold.

So how can we fit a small or large coil on any SD2200/GP/GPX models and get even more grunt out of it ??

We all know small coils are made to aim at small gold, and larger coils are made to target larger deeper
gold, so if we combine our coil size used and the correct frequency settings, again thats when magic happens.

And on the SD2200/GP series the method to do this is as follows.

Small coils 6" > 14" Mono or DD Round or Ellip

Fit the coil and set your preliminary switch and knob settings on the front and rear panels.
keeping your finger on the power button while you do the next step.
Power up the machine and hit the Auto-Tune Button on the front panel and count
to 35-37 seconds then power off the machine.
this will halt the auto frequency tuning in a high frequency and make the detector
more sensitive to smaller shallower gold.

Larger 16" > 25" Mono or DD Round or Ellip

We go through the same procedures as above, but the counting time
is only 5 seconds before you power off the machine.
This halts the detector in a very low frequency which is Dynamite on deep
larger gold when running a larger coil..

Now, this tweak does have some limitations on when you can apply it, and the big nasty is EMI
or Electro Magnetic Interference.
So if there is quiet a bit of EMI give it a try but there's no promise the machine will run smooth
but you wont know until you actually do the tweak..

This Tweak can also be used on the GPX Series also by using the Manual Tune in the rear screen

Happy Scratching fellow Gold Goblins



Pete :.8:

Nice job, mate. I have never heard of that before.. ( checking date...Its not April 1) Gonna give it a shot next outing...

Cheers pete, something else for me to try in the search for the elusive first nugget

Gday Pete,
By turning the detector off before the auto tune is finished,is there a chance it will stall on a noisy channell?
Or will the detector select a quieter channel if its done to suit low or high frequency?
I will give it a try on my 4000 for sure.

G'day Gus

The frequency tune has the primary job of selecting a smooth non EMI disturbed Frequency, but within
any given area there may be a 100 frequencies that will run smooth.

It also effects the coils potency slightly, as the post states about target responses to low & high frequencies,
but in this game a 5% increase in machine performance is a lot.

To answer your question mate
Seeing as your running a GPX do the tweak by manual tune, small coils start off at 255 and slowly
work down the frequencies until you get the highest non EMI affected frequency , should be between 240 - 255.
With larger 16" > coils do the opposite, start at zero and slowly work your way up the frequencies until you find the lowest quiet non EMI affected frequency.


Pete

Thanks mate,will do.
I reckon a 5% increase will be handy in a few places where I have found deep gold.
Cheers.

Hi Pete
Great idea I have a question on this.

I use a 20" NF on my SD2200d mostly for ground coverage, is it possible to do the tweak as if you had a small coil on but with the 20" just wondering if this would make it more sensitive to the little bits whilst still covering alot of ground / swing??

cheers
Lee

Geez im sooo bloody sorry for takin so long to answer Lee, i didnt see the Q mate hhahahaha.

Basically No, the size of your 20" is the limiting factor to the sens on small gold, you would be better off down sizing to get more sens.
I have tried this on my 30x7 NF and it works a treat as its a skinny bugger and lends itself to high sens settings.

Pete

Hey Pete
Thats okay mate thanks for the info, they say folks in the West are a little slow but gee mate?? LOL
cheers
Lee

Hi Lee, wait till ya get over here and experience the whole WA [Wait Awhile], they close shops for lunch but im over here to relax and slow down so i aint gunna knock it to much and the cats will belt the weagles this week

Yeeeeee Harrrrrrrrr Pa

where do you get this stuff from

How many seconds on a 15 inch carbon coil....

I kid you not!.It,s in transit to b fitted to an Moddified extreme(Hi woody ..Pete?)
Check with chris ...Exact seconds please i am a precise fella!