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best dector for diving?

Mark...here's what I know (not much):
1. Aquastar II has been discontinued. You may get one second hand.
2. Aquasearch is rated to 1 metre. You require 60 metres.
Tony.
 
Thank you all for the feedback ...
Very interesting comments you've made. I guess I definitely need a machine with a variable pulse delay.
Mostly I'll be diving around 5 to 30 metres but wanted the option to go deeper. I'm after non-ferrous targets so sensitivity is an issue.
I've read that the Mel Fisher group and Barry Clifford (WHYDAR pirate wreck) have used both the Aquascan and JW Fisher 8X detectors for detecting gold and silver coins so I guess they're both capable at varying depths.
The Aquapulse 1B sounds just right: ... "The 1B can detect objects up to a range of 3m (10ft). This makes it the most powerful unit on the market. Apart from the sensitivity threshold control, the 1B detector has an additional control to enable the whole range of AQUAPULSE coils to be used with it. The same control can be used to reject surface clutter such as ring pulls, cigarette foil etc., often found buried in the sand or mud... http://www.aquascan.co.uk/aq1b.html
Still - JW Fishers claim their Pulse 8X is on the same level re performance but better with regard to accessory options and it has both meter and audio readouts whereas the 1B only has audio. Also the 8X has a 'leak detection system' (?)
There's so much 'marketing hyperbole' around these days that its sometimes hard to figure out the realities - but I suspect that I can't go too far wrong with either of the machines I mention here.
I am really keen to see the specs on Mr. Fosters new machine - Any chance of comparative data Eric?
Mark
 
Hi Mark,
For deeper diving the AQ1B is the one I would go for. Why? Because I designed it. It was originally designed back in the early 80's for police diving work. So it had to be rugged. It has been continuously updated and improved since then, and Mel Fishers group used many of them. The design was sold about 5 years ago to Aquascan International, who I know well. They specialise in underwater survey equipment. The AQ1B has a delay control, so if you ask for the 20uS setting, you will get the added sensitivity for shallow water. For deeper water, you can then increase the delay to reduce the water signal. It doesn't have a meter because you need your eyes for other things when diving and the audio tells you all you want to know. It has VCO type pulse audio, which gives a clear signal of even the weaker targets, and is easily heard above the noise of your breathing apparatus.
Eric.
 
Hello Mark,
I once picked up on trade the AQ 1B, The unit arrived with a bad coil so Eric sent me a link "Aquascan" of the company that now sells parts for this detector.
The unit first arrived with the 8" open white coil and replaced it with the 10" center mounted coil in the picture. It still had the bone-phone so I replaced that with a set of waterproof Garrett phones.
As I remember the unit responded to nickles and gold stronger than the higher conductors, Even then this machine was geared for gold. For coin size objects or a hair smaller this unit did well.
The detector is build tough and well balanced, Wish I still had my unit as I sold it several years ago.
The unit needed to be ajusted every few minutes to maintain a steady threshold but over all it was a good detector.
HH, Paul (Ca)
 
Hi Paul,
The picture is of a detector called the Aquasport. It had similar performance to the AQ1B, but different mechanics. i.e. the AQ1 has inbuilt rechargeable batteries. In the Aquasport, you load your own, down the tube with the slotted end cap.
Eric.
 
Thanks Eric,
You're so right, It was the AuquaSport. And it carried 8 DD batteries as I remember.
At the time when I received this unit it had a bad coil, You had sent me an e-mail with an "Aquascan" link about 4 1/2 years ago, They sold me a coil.
HH, Paul
 
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