TGSL Experiments

[golfnut]

I worked for electroncs firm.

I have seen a case where light gave cct extra noise.


Is your cct in a lightproof enclosure?

[ivconic]

I worked for electroncs firm.

I have seen a case where light gave cct extra noise.


Is your cct in a lightproof enclosure?

Is "cct" stands for closed circuit television?
Than "my cct" actually is coil - the search head.
Yes it is in (sort of) lightproof enclosure.
But soil is not!
So there is chance that sun rays (more than just simple light) do affect soils magnetic features.
Because content of sun rays is more complex than it seems.

[mikebg]

To avoid sunray noise, use a women as assistant for treasure hunting.
The method is known as
HUNTING IN THE NIGHT.

You can modify the lyrics of
Frank Sinatra song - "Strangers In The Night":

Strangers (hunters) in the night exchanging glances
Wond'ring in the night what were the chances
We'd be sharing love before the night was through
Something in your eyes was so inviting
Something in you smile was so exciting
Something in my heart told me I must have you
Strangers in the night
Two lonely people, we were strangers in the night
Up to the moment when we said our first hello little did we know
Love was just a glance away, a warm embracing dance away
and
Ever since that night we've been together
Lovers at first sight, in love forever
It turned out so right for strangers in the night.

[Qiaozhi]

Is "cct" stands for closed circuit television?
Than "my cct" actually is coil - the search head.

"cct" is shorthand for "circuit".

I worked for electroncs firm.

I have seen a case where light gave cct extra noise.


Is your cct in a lightproof enclosure?

That's another possibility. Perhaps it's not the coil that's being affected by the sunlight, but the circuit in the control box.

Ivconic - To check this out, you would need to carefully move only the search coil into the sunlight when you next go out detecting at dawn.

[ivconic]

"cct" is shorthand for "circuit".


That's another possibility. Perhaps it's not the coil that's being affected by the sunlight, but the circuit in the control box.

Ivconic - To check this out, you would need to carefully move only the search coil into the sunlight when you next go out detecting at dawn.

I see.
Should make no differences because detector is also closed in non transparent enclosure.
Yet, it can be checked too.

[Qiaozhi]

I see.
Should make no differences because detector is also closed in non transparent enclosure.
Yet, it can be checked too.

It would be interesting to understand this better. No doubt it will turn out to something simple, and not a mysterious force emanating from outer space, or some telluric interaction.

[ivconic]

It would be interesting to understand this better. No doubt it will turn out to something simple, and not a mysterious force emanating from outer space, or some telluric interaction.

Usually it appears like that at the end.
But life is more beautiful when things are complicated bit more...

[Jerry]

Yes, there is so much going on around us every day that we just are not aware of, so I never discount anything.

http://www.google.com/search?q=schum...w=1272&bih=812

Jerry

[simonbaker]

So what else could affect the coil when moved between an area of shade and one with sunshine?
How about moisture?

How about the sun ionizes a layer on the surface of the ground, creating a "shield"?

That or aliens in underground tunnels moving their deck chairs to warmest spot...

[simonbaker]

"cct" is shorthand for "circuit".


That's another possibility. Perhaps it's not the coil that's being affected by the sunlight, but the circuit in the control box.

Ivconic - To check this out, you would need to carefully move only the search coil into the sunlight when you next go out detecting at dawn.

Aha! I know for a fact that the circuit in the control box is sensitive to light! I had a big problem once testing because of that. The diodes I use (in transparent glass) are very sensitive to light, maybe other components too. I think I taped the diodes once to prove it.

It seemed to change the gain or threshold and changed the chatter level.

-SB

[Max]

How about the sun ionizes a layer on the surface of the ground, creating a "shield"?

That or aliens in underground tunnels moving their deck chairs to warmest spot...

it's about humidity
at surface of plants and foliage very often (expecially at early morning) there's a layer of water and water drops and excess humidity from night...

water is somehow conductive (expecially if there are salts in soil, as always is...) so there are conductive layers that expose change in electrical static charges on foliage and grass as example, and then in the sun exposed places , instead, the humidity is lower, the superficial layer of soil have lower conductivity and so static charges can accumulate e.g. at tips of grass etc and you "see" that stuff cause coils are sensitive to static charges and change in conductivity of soil :geb works if soil remains "the same" for long, but if you change from hi to low humidity or the reverse you got troubles with ground balance in VLF detectors

this problem is generally a non-issue with PIs, instead, cause conductivity of water related soil or sand is ignored cause of delay control (more than 15uS for seawater as an example) and so not detected the change in humidity and conductivity from wet places (seashore) to dry places (dry sand)

btw also electronics could be an issue: if sun warms up the box temperature change inside can cause instability , cause of very hi gain involved in the chain; usually fets and transistors are very prone to that thermal drifts

[Amalio]

Hello friends

someone could tell where I can find audio TGLS scheme 555.

TGLS forum too long to review it

regards

[Jerry]

Hello friends

someone could tell where I can find audio TGLS scheme 555.

TGLS forum too long to review it

regards

Check out Tessoro Golden Sabre forun at http://www.geotech1.com/forums/showt...=12692&page=97
look for post 2403 on page 97

Jerry

[Amalio]

Thanks Jerri

very kind of you

IGLS'm busy with, but I want to start studying the audio with 555 (or 556) for md

greetings

[Mullihaka]

Which is more important for the coil: exact inductance or resonance frequency?

For some strange reason, the inductance of the coil drops lower when I take it out of the former. It is tied with dental floss (mint flavor). Tying does not increase the inductance when on the former and the former is dry wood. There's not big metal lumps nearby. I feel it's about the shape of the coil; I haven't glued or epoxied it.

Therefore, I have problems predicting how much extra turns to wind to achieve the exact inductance values as recommended everywhere for TGSL (6mH for TX, 6.5mH for RX).

If I use capacitors to tune the the frequency to be 14.5kHz for TX and 16.1kHz for RX, does it matter what are the inductance values?

I remember having seen somebody mention, that the TX oscillator gives the biggest output when the value of C1 is exactly ten times that of C2. If I maintain this relationship, what are the odds that the device would still have all changes to get to the "30cm club" (if everything else is in shape)?

Yes, I know that I should make new coils. I just have run out of wire. I'll order a truckload of it, but in the meantime I would like to hear experiences from others. I also try to get dental floss with other flavor.

All hints appreciated.