VLF Magnum Build

[mikebg]

mikebg,

Regarding suspected or probable conductance problems, a faster surer method is to clean the area and apply a silicone based shielding conductance material suck as PAN-HCl; Silicone rubber.

There are spray coatings on the market also, but a tooth brush and alcohol are my 1st choice.

I did note your drawing, perhaps moving the resistor to opposite side of the board or a shielded jumper wire.

Little things like the JFET/resistor laying across an exposed trace is asking for trouble.

I havent checked yet, but this circuit is on Magnum VLF?

Gary N Thailand

Gary, this project differs from yours?
http://www.geotech1.com/cgi-bin/page...gnum/index.dat

[baht7]

oppppps thxs

[mikebg]

oppppps thxs

Gary, my translating machine refuses to explain what means "oppppps thxs"
Please explain this to the Thai language.

[baht7]

Oppps Thxs = confused on the topic.

[turtlebowl]

Hey Baht

Just curious what amounts of mineralization you must deal with over there in Thailand?
Heavy, lite, medium?? How about the beaches? Heavy or lite iron/minerals in the beach sands??

[baht7]

Turtlebowl

Im not sure.

Good question...I might need to Google that one.

Ive looked at some of the stream beds...nothing apparently rusty or heavy volcanic like Mexico...lots of crystals in the sand. Rocks/boulders are blotted hard Dark Gray to bright white perhaps granite. I have noticed in farm areas the ground is dark gray to very black, perhaps it is volcanic in origins, I can visit a rock yard and take a few photos for you if u like.

Im in the process of building 2 units, 1 VLF and 1 Pulse.

Twice a month I gather field data, just started on that.

What I have encountered is the locals eye you real hard when they see your not 1 of them and your holding a map and a compass and a laptop on the hood of your car, they wanna know why the hell your digging around in the sand on the side of a mountain village road in the middle of God who knows where.

Im not sure if I dislike the attention....Hollywood thrill perhaps. All I know is this...If I fine a single item worth $5..Ill be ran off in a heart beat.

Ive decided on 2 types of searches, I call 1 Passive the other Aggressive.

Passive to me is streams and creeks and Mountain Buhhdist temples. Aggressive is Historical.


I know I drift off your question but I want to see what responses came back.


Gary in Bangkok

[6666]

Where did you find all the bullets ?

[turtlebowl]

Bahtman,
Bahtman,
I asked about the Mineralization becuase you had been asking about coil and machine design. The types of which can be tailored or chosen for a particular type of soil as you know. Also was just curious of what type of soils were there. Mainly if the beaches are zero black/iron/mineral like the USA SW beaches or very mineralised/irony/black like here in the NW USA.
All this also becuase recently saw some videos of several Thais with metal detectors hunting for and finding nuggets, I do not know where as I don't speak Thai very well.
Somewhere on the net I saw a chart/map of soil / mineral content which was easy to use. You just clicked on a map the area you wanted info on. Can't remember where that was either.
Anyways good luck on the project.
On wire and electronics parts: If your into a nice Sunday drive about 60 miles There is a shop located in Pattaya that is easy to find which has boxes and boxes of anything imaginable for discrete components. As well as project enclosures and wire just down the street. All Cheap. While I am thinking of it there is another electronics parts house in the basement of "Tucom Shopping center" on Pattaya South, 4 or 5 blocks up from Beach road.
The big electronics parts store is located just across from the Naklua (North Pattaya) city outdoor market. The market is on Sawang Fa Road about halfway between Sukhemvit highway and Naklua-Pattaya road. Phone number is: 038-222277 or 038-221680. The old man speaks great English the daughter a good bit also.
Enamaled wire is in the first block to the south of where Sawang Fa meets Sukhemvit Rd.
The old man at the Electronics Store told me of the wire shop,( I haven't been there ), when I showed him a piece of Coil Wire.
This is a great time of year to go to the beach and have alittle fun.
Regards, TB

[baht7]

Now thats infomation I like..... Ill will go to those places you mentioned. This dragon teeth searching for parts is a head ache.

[turtlebowl]

BahtMan,
Here is a scan of the Business Card for the shop I spoke of. When you get to Pattaya just show the Taxi guy . I don't read this jibberish but the address must be on there somewhere.
There is a baht bus running from downtown Pattaya to Naklua for 10 baht that goes to the foot of Swang Fa Road if you want to travel from downtown that way. A short walk up the Sawang road to the shop.
The shop itself is small but crambed with boxes and drawers of discrete components etc. You'll love it.
TB

[baht7]

4 conductor individual screened wires.......VLF Magnum Unit...From search head to control unit. cant locate in 2 meter lengths this wire. Option (1) ask for for for advice. Option (2) Uses 4 pieces of Mic wire.

The Gold nuggets u mentioned Turle...yes they are here but Thais look for lost Rolexs at the beach mostly.

They come out in wolf packs on the beaches...

If you ever come back over..Give me call Turle

Gary N Bangkok

[baht7]

Noted on the card
thxs

[baht7]

I was wondering about the individual shielded 4 conductor cable. Post didnt make it it appears.

Cable from the search head to the control box.

is there an alternate shielded cable or I am stuck with each conductor being shielded.
I can always use Microphone wire, but I was wondering about the shielding. Is this unit (Magnum VLF) really that sensitive?

[baht7]

Im not seeing my post till after I log in and click Quick reply.
Is there a problem?

[baht7]

Dang Im dumb....I forgot to page forward