GPR - project

Hi SeeKER

I study your massage and experiments a but GPR It Is interesting

May be please sand for me SHF module and schematic GPR ?

or attached in this page PDF form?
Best Wishes

[Seeker]

Hi,
I think it's good idea to look on page 94 - Microwave journal - august 2001.
May be this is a good point to start. The article is Very good explanation of bow-tie antenna and impulse generating circuit – very close to ,“DIY GPR “ and big trouble for every construction of gpr – ringing antennas.
Best,

Hi Ivan,
If you read all message in this project , you will understand what I think about UWB GPR . Exist many constructions useing UWB technology, but antena problems and SHF equipment do them realize impossible for many amateurs.
My idea is simple: use narrow band TX and RX, spiral antenas and minimize SHF part to few elements.Another are low frequency parts and unexpensive equipment.
900MHz band is not suitable for me, there is GSM band (in my country) , but not big different between 900 and 2400 MHz.

[Ivan]

Hi,
I think it's good idea to look on page 94 - Microwave journal - august 2001.
May be this is a good point to start. The article is Very good explanation of bow-tie antenna and impulse generating circuit – very close to ,“DIY GPR “ and big trouble for every construction of gpr – ringing antennas.
Best,

[Ivan]

Hi,
I mean some frequency about 900Mhz, because of enough resolution and good depth of penetrating . Easy for building (“low” R.f. freq.) and so on.



Best,

[Seeker]

Hi Seeker,
The frequency (2ghz) are very unusable for treasure hunting . We need a GPR with max depth about 3-5 meters. With 2ghz you will search something in Wall or in ground to 20 cm only
Best,

Hi Ivan ,
2GHz can penetrate little, but enough in ground. May be you make parallel with 2,4 GHz WLAN ? There are some differences.
I have made experiments and receive signal trough thick stratum of ground.I think this is enough for GPR application.

Regards

[Ivan]

Hi Seeker,
The frequency (2ghz) are very unusable for treasure hunting . We need a GPR with max depth about 3-5 meters. With 2ghz you will search something in Wall or in ground to 20 cm only
Best,

[Seeker]

Picture of what?

[schatzsucher]

have anyone picture?

[Seeker]

Hi aft_72005,
I complete SHF module and will send you precisely schematic soon.
Best regards

[aft_72005]

Hi Seeker

I study what you wrote, interesting.

And wait for extra hearing from you
In the matter.
Best regards .

[Seeker]

Hi again,
the most difficult module is mixer.There are a few parts , but mast make it very precision.After mixing the signal not exeed 10MHz .Find splitter from TVsat equipment for split of signal for two receivers, for 950-2150MHz . This will be box for insertion of mixer PCB.Some splitter parts will be in use.You can find splitter for cableTV, but parts inside are up to 900MHz.The PCB mast make on hand.When you have splitter i send you PCB right for your box.
This is the schematic of mixer:

[Seeker]

Hi aft_72005,
All your equipment is enough for this project.
First - for TX I use videotransmiter at 2480MHz.You can find this in market, where sale 2,4GHz videosenders for TV or VCR.The price is about 40-70$ and amplifier is 0,5W for 2,4GHz WLAN.Or I can send you schematic to build TX.
In the TX mast be change varicap to have deviation of frequency 150MHz at 1Vp-p of incoming signal.If you get TX for videosender ,first connect to video input sinesoidal generator 1Vp-p.The output power of sender is about 50-100mV.It is enough for begin.You can use sender's antena . For test deflector you can install 20x20sm aluminium plate at 1m from antena
Second you mast find old satelite converter (LNB),inside have GaAs FET.Very carefully you mast to take out transistors. You need in 2 pieces.To make diversion module you need 3 connectors, cooper pipe, cooper rod(compact cable),T-form cooper element for freon lines(airconditioner).In fact another name of SHF is "water-conduit technics"
I send you picture of diversion module.

[aft_72005]

Hi Seeker

Please more explain about this diagram .

For example ,what if frequency produced when the material
Against antennas ?
What range of frequency read by frequency meter when distance
From the antennas make variable ? and …...
Are you build shf circuits ? building tx 2480 MHZ with 0.5 w and rx
not easy ,we need measurement equipments in this band .
are you have it ? I have ,but not it in this frequency range .my scope
Tektronix 475 with 200MHZ bandwidth and anritsu 1GHZ digital
Frequency meter .
Best regards .

[Seeker]

Yes, now I make experiments to find the best modulation frequency for all depths in working range.Because I have not SHF equipment , I can't choose the best carrier frequency, but I think it is not so big problem.

[aft_72005]

Hi Seeker

Ok, are you have practical experiment with
This block diagram ?