chinese metal detector tw 300

[kt315]

Page 2 shows the technical parameters. Note TX frequency is 460KHz.

absoliutely very clear it is pre-prototype of Chinese MD-5006...-5008...-5012 models. if you open a manual of them you will see this '460 kHz', but the frequency is a quartz one they use. the freq is divided... and... oh my God... we get White's standart freq... near to 7 kHz (White's uses 6,59 Khz). seems they took White's oldie detector schematic for the coping... but I am not still in course which.

[Qiaozhi]

thank you Qiaozhi for the translate.
i have a fiew questions about the control panel.



<#7 point> is on - off for charging battery ?
a nd where is the on and off?

because <#9 point> back on the box there is a socket for charging battery.

<#3 meter. > for what?

<#4> this is for sensitivity ?

<#5> this is for ground balance?

thanks....

The numbering around the front and back panels in the diagrams do not match the text, and the diagrams are too dark to see any detail. Please can you post some close-up photos of both panels?

Also, I agree with KT315. This detector is most likely just another variant of the MD-5008 type detectors.

[nikoszirgon]

sorry for late but i was for digging.....take a look my friend in panel of detector and tell me... thanks

[Qiaozhi]

Translation:
.
.

[kt315]

'white's design' again? can you give general photo of the exclusive?

[Qiaozhi]

This is how it appears to work:
The Mode Switch is set to Ground Balance, you position the coil above the ground, and press the Reset button. Then switch to Discriminate, adjust the Sensitivity control and start detecting. There does not appear to be any ability to adjust the discrimination, so this detector is a simple ferrous/non-ferrous T/R detector.

[nikoszirgon]

This is how it appears to work:
The Mode Switch is set to Ground Balance, you position the coil above the ground, and press the Reset button. Then switch to Discriminate, adjust the Sensitivity control and start detecting. There does not appear to be any ability to adjust the discrimination, so this detector is a simple ferrous/non-ferrous T/R detector.

thank you very much for the translate my friend you help me very much

[Funfinder]

WOW, those new chinese-detectors have functions...

http://www.chinametaldetectors.com/M...al%20Detector/

Responding to check your E-mail, discusses the metal items,

But I guess this one here could be a real good deal - the Snake SK500 :

http://www.chinametaldetectors.com/M...etector/SK500/

Company : Xingtai Daly to technology companiesCountry :ChinaContact person :Jian Wei

12V accu, 5m depth, metal discrimination, easy handling, made in 2010

Somebody can tell us what it costs and what functions in detail it has? Is this a clone? Anyone here that bought it already?

Even if that detector goes just 3meters down it would be very interresting if it costs only around 500 bucks!


edit: 3m really seems to be more realistic - here on this page:
http://www.e-sun.cn/en/d.aspx?pht=980
I found the TS500, also described at chinametaldetectors with 5m:
http://www.chinametaldetectors.com/M...al%20detector/
that is has 3.5m. btw. the TS500 is from 2008 and has a weight of 4,5 (8kg).

[wam]

Hi,
All that metal detectors are built on the same design from 20 years
ago. The circuit diagram is very much like Minelab Sterling, Relic Hawk
etc. It does not use any fancy ICs but it uses very desire design rules.
It is to operate deep so it has more TX power (not like fames detectors operating
on week battery packs). If You check inside, You will see that TX part is in separate module fully shielded, all cables are shielded. The RX part is metal shielded and discrimination module as well. The third principle is the coil – it does not compromise winding – it has over 2000 turns on RX side. Practically depth of 5 – 6 meters refers to aluminum plate 60cm x 60cm x 1cm in dry ground. It translates to over 50 cm range for 25c US in the air test in disc. mode. The TX frequency is typical 6.5Khz,
audio 430 Hz and it is classic VLF machine but not design for public usage so it has no need to deliver profit on compromises with battery or copper wire. It is to be sold for gov. institution so no need for big production profit in materials. All wonders (depth) are made via effective design approach – not via electronics mystery.
Above detectors sells between $400 - $600 US.

[Funfinder]

Hi wam,
thx for the info - made those detectors even more interresting. Great you even know what design the circuit is.
And if it's mostly sold for gov. institution it has to be at least some higher level of reliability, durability and quality.

Can you imagine about the most important differences and improvements between TS500 and SK500?

Especially important: The new SK500 seems to have really a great metal-distinction ability which is good, otherwise somebody can use directly P.I.

wam, do you have any info about how good it can distinguish metal?

As it seems the VU-Meter acts as indicator for strenght or in what range the metal is (left iron, middle gold, right silver etc.) And for shure the audio-signal will do the main job.

If it has highpower 12Volt accu pack and charger this is very good! Sending the full energy into the ground! Coil diameter seems to have around 35cm / 15 inch without pinpoint hole, but this is not so important, as long as the coil is stable enough and not too heavy.


I'll try to get the Snake SK 500 and tell you how it works! Because it's a price-worth alternative and a great deal for very deep buried coins and smaller stuff.

[kt315]

Sunday, May 16, 2010

Chinese Death Sentences for Tomb Raiding



The New York Times on 5/14 carried this Associated Press report that China has sentenced some tomb raiders to death:

China Sentences to Death 4 Robbers of Old Tombs
By THE ASSOCIATED PRESS
Filed at 8:48 a.m. ET

BEIJING (AP) -- China has sentenced to death four robbers who used explosives and heavy machinery to plunder tombs almost 2,500 years old.

The state-run Xinhua News Agency says the four sentenced Friday were part of a 27-member gang who robbed a dozen tombs near the capital of the central province of Hunan in 2008 and 2009.

The report says some of the more than 200 stolen artifacts were under China's highest level of protection. One of the tombs dates from the Warring States period that began in 475 B.C.
An investigator told Xinhua all the relics were recovered.

The Intermediate People's Court in Changsha handed down the death sentences. The other robbers got prison terms.

China executes more people than any other country in the world.

Capital punishment for this kind of crime seems like gross "overkill" to me, and raises further questions about double standards at work. In particular, one wonders whether similar punishment would be meted out to members of the Chinese elite, particularly when antiquities trading is quite popular in such circles.

I suspect many archaeologists and others who have ties with the Chinese cultural establishment are also horrified by such harsh punishment, but I suspect few, if any, will condemn such death sentences publicly.

[Funfinder]

Whats more worth?
"Robbing" some "not really needed" gifts of the death or some "not needed" lifes?

Such death-warrants are not about moral or ethical reasons but because rich and mighty people wanna protect "their" property...


> it has over 2000 turns on RX side.

Very clever! A good generator or electro-motor also has alot windings to achive a good operational efficience.

Coils with just 10 or 20 windings CAN'T work good, those receive or transmit a much to weak EM field. The same if those use just a few milliwatt. Take a single wire and measure the EM-Field it has around if some electrons move... - and we're not talking about a cellphone antenna.

The same with speakers: a few mini-turns of wire won't bring a nice disco-sound power output!

Anyway - when I've got this detector I could say:
"If I would use this where it comes from I could stand with one leg already in a tomb - possible my own..."

[Morgan]

Tomb raiding

Sunday, May 16, 2010

Chinese Death Sentences for Tomb Raiding



The New York Times on 5/14 carried this Associated Press report that China has sentenced some tomb raiders to death:

China Sentences to Death 4 Robbers of Old Tombs
By THE ASSOCIATED PRESS
Filed at 8:48 a.m. ET

BEIJING (AP) -- China has sentenced to death four robbers who used explosives and heavy machinery to plunder tombs almost 2,500 years old.

The state-run Xinhua News Agency says the four sentenced Friday were part of a 27-member gang who robbed a dozen tombs near the capital of the central province of Hunan in 2008 and 2009.

The report says some of the more than 200 stolen artifacts were under China's highest level of protection. One of the tombs dates from the Warring States period that began in 475 B.C.
An investigator told Xinhua all the relics were recovered.

The Intermediate People's Court in Changsha handed down the death sentences. The other robbers got prison terms.

China executes more people than any other country in the world.

Capital punishment for this kind of crime seems like gross "overkill" to me, and raises further questions about double standards at work. In particular, one wonders whether similar punishment would be meted out to members of the Chinese elite, particularly when antiquities trading is quite popular in such circles.

I suspect many archaeologists and others who have ties with the Chinese cultural establishment are also horrified by such harsh punishment, but I suspect few, if any, will condemn such death sentences publicly.

This death sentences means China give more value to artifacts than people life. it happens the same in arab countries,and some are executed in the TH place without any judgement...
Its a shame...

[Funfinder]

It's a shame and it's cruel! It's like the same some got shot to death from a junkie in some ghetto for 5 bucks.
Somebody here saw the film: "Blood Diamond"? The same again...


An other question:
Anyone knows about the warranty services with chinese detectors? Is this really a big problem and exists such at all?

[technos]

This death sentences means China give more value to artifacts than people life. it happens the same in arab countries,and some are executed in the TH place without any judgment...
Its a shame...

They don't have any eighth amendment to the constitution. I wonder if the Chinese artifact thieves weren't part of organized crime. I don't see how taking a vase was death penalty worthy. The FBI came down pretty hard on some artifact poachers where I'm at recently.