Whites Surf PI schematic

[Qubic]

No problem. I'll measure as soon as I get back home...

[Qubic]

Single thread carbon fibre resistance measured:
1.5m ~ 244 ohms (just about enugh for 20cm dia coil to come around)
1m ~ 185 ohms
10 cm ~ 28 ohms
1 cm ~ 8 ohms

It is difficult to get good contact because it is so loose material. If thread is twisted and visually be campared to wire (copper core) it's cross-section is slightly less than awg 24.
If you need anything else let me know.

But I'm still looking for the answer if it's normal to get a response while tilting coil?
I tested this out on two different locations.

[Koala]

if it's normal to get a response while tilting coil?
I tested this out on two different locations.

over normal fields

Once ground balanced properly. You can swing however you like and it will not sound.

There should be no difference between swinging flat or like pendulum. Swinging through tall grass or over wet concrete paving slabs.

When I test my first homemade coils on my nice flat law and they have been okay but as soon as I tried them on real fields they were rubbish

To be able to pick out faint signals your coil has to run very quite.


You should be able to swing it round in a circle above your head without it sounding. It also should not make a sound if you jiggle it up and down. As long as your windings are well potted and the shield is working.

[homefire]

"
But I'm still looking for the answer if it's normal to get a response while tilting coil?
I tested this out on two different locations."

With that detector Yes. Your causing a Variation in the Ground Signal.

[Koala]

The only way I can get mine to work properly is to keep the two Tx and Rx cables along with the shield separated all the way to the PCB

[Koala]

"
But I'm still looking for the answer if it's normal to get a response while tilting coil?
I tested this out on two different locations."

With that detector Yes. Your causing a Variation in the Ground Signal.

Whoops somehow I thought I was answering in the IDX thread

Sorry

[Qubic]

I'm using low capacity microphone cable(tasker c 129)
Is there any procedure to gb/tune surf 1.2 to the enviroment? All I can set is the delay, treshold, volume and adjust dumping resistor. Coil is mono.
I have neutral ground but my intention is to build a small detector for snorkeling. I'm not trying to build depht monster. I just need a stable machine with as little as posibile false signals.

[homefire]

You won't have the issues in Salt water. Wait and See. Garret did not even Shield the XL 200 because it was not needed.

[jladre]

I'm using low capacity microphone cable(tasker c 129)
Is there any procedure to gb/tune surf 1.2 to the enviroment? All I can set is the delay, treshold, volume and adjust dumping resistor. Coil is mono.
I have neutral ground but my intention is to build a small detector for snorkeling. I'm not trying to build depht monster. I just need a stable machine with as little as posibile false signals.

Her is what you are looking my friend. Surf 1.2 but problem is if you use in saltwater you will be digging targets at depth of 1 foot or more..but stable even in black sand.

[jladre]

For salt water pi just nevermind shielding the coil.. your machine will work in max performance without the shield but fir inland use better shield it.

[Qubic]

Jladre, so true! This is exactly what I'm aiming for.
It will be additional (the fun) detector as a companion to my infinium ls.
No problem about black sand, have none and places where I hunt are not so cute and sandy. Lot's of pebbles, rocks...
My concern is to build tank like coil to handle such terrain.
Do you have any recommendations - specs on coil?

[jladre]

Jladre, so true! This is exactly what I'm aiming for.
It will be additional (the fun) detector as a companion to my infinium ls.
No problem about black sand, have none and places where I hunt are not so cute and sandy. Lot's of pebbles, rocks...
My concern is to build tank like coil to handle such terrain.
Do you have any recommendations - specs on coil?

300-380 inductance is advisabe, use 24-26 awg copper wire, just stay on 6-8 inches diameter coil for easy pinpointing. Ordinary mono coil is easy to made.

[ionut_mtb]

Her is what you are looking my friend. Surf 1.2 but problem is if you use in saltwater you will be digging targets at depth of 1 foot or more..but stable even in black sand.

Do you use 9v battery???

[jladre]

Do you use 9v battery???

I used 3 lithium ion 18650 battery in series.

[seriall714]

Hello everyone,
Can you share lastest version Working TESTED surf pi (for underwater) ? i download 30files and almost everyone of them is different. i confused i want to make waterproof surf pi version for saltwater like scuba tector...

thanks.