45
QED TIPS
Coil Choice
Your coil size choice on any given session indicates what you are looking for. For example, if you
decide to use a Sadie, 8” commander, 9” elite then you are looking for
relatively shallow targets,
which are mostly small gold (rising pitch). Of course if the small coil is waved over a shallow big bit
(falling pitch) then you’re in luck.
It’s unlikely that you are patch hunting with a small coil, therefore using THS
-B below NULL will
accentuate the small targets, especially the really small bits that another well known brand and
model excels at, but which when set up correctly, the QED and one of the above coils will find the
same targets.
You could use a relatively highish THS-A (70 plus) with a THS-
B as far below as you can (you’ll
maybe only get 2 -3) below NULL or a medium THS-A setting (35-65), with THS-B way below NULL
to achieve similar results.
If you are using a medium sized coil (11” to 14”), then by definition y
ou are sacrificing the really
small gold in preference to finding bigger gold at greater depth so you are looking for any gold in
range of the coil. You SHOULD still use THS-B below NULL with highish THS-A (60-90) as most
gold in this range will be smallis
h bits, with hopefully many larger bits. Note that the ‘A’ in THS
-A is
for ALL gold, so should be used high, with THS-B (just below NULL) to accentuate smallish gold
and to increase depth.
With large coils (18” +) then you are definitely looking for big g
old at depth (and sacrificing small
gold) so a really, really high THS-A (75-90), high Gain (10 if possible) with THS-B above NULL
(you’ll maybe only get one above) is the way to go.
In all of the above scenarios:
•
Constantly check your Gain with the view of increasing it when you can.
•
You can only go as high with THS-A as the ground will allow, ditto with the THS-B below or
above NULL
•
the Trick is to setup without the QED being noisy but still with maximum allowable
performance.
THS-B
SMALL COIL
Lowering THS-B below NULL accentuates rising pitch targets.
Just as importantly, it also increases depth; the more you can lower THS-B below NULL, the more
depth you will get. The depth increase is significant.
Even if you are using very high THS-A settings, which by itself increases depth, you will get even
more depth if you can lower THS-
B as well, even if it’s only by 1.
Summary of Contents for PL3
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