1-is the loop of the locator a tube or bar of aluminum"Imean there is agape inside the loop or it's just abar of aluminumand what is its diameter?
Coil Shield tubing. Yes there should be a gap within the housing just as any VLF Shield.
2-how to contruct the TX and RX inductors witch dimensions of the ferrite toroide core and how many turns for each loop? I have NO Clue on this. I don't see but one Toride in the schematic and it's not in the coils.
3-how to measure its inductance with or without loops ? Assuming your talking about the Tx and Rx Coils ? Use a coil calculator plug in the known Frequency and associated Capacitors if you can find what they are. Not Labled on Schematic.. Look what I found.
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http://thunting.com/smf/vlf_designs/homemade_12_whites_coil-t6902.0.html;wap2=
"Hello Critterhunter . The whites QXT Quantum runs at 6.59 khz . And as you already know the 950 coil specs are:
1. TX is 540 uh [micro-henry] and a dc resistance of 1.4 ohms on connector pins 4,5
2. RX is 36 mh [milli-henry] and a dc resistance of 122.8 ohms on connector pins 1,2 "
Now you know the Coil Parameters. Use a Coil Calculator to find number of turns for your given coil size.
4-how to measure the frequency of TX abd RX? :See Below
Tx Freq is generated by 26.37 Osc. Then divided by CD4024 by 4 times. 26.37Khz / 4 = 6.5925Khz. A standard Whites VLF Frequency. There will be a offset of a few hundred Hertz on the Rx like most VLF detectors. I'll leave that up to you to figure out. Hint: It's on the Net.
5-is the control box and the frame must be made of aluminum ir just any material? Aluminum would be advised. Circuits need to be shielded.
6-what is the best replacement for Ics? No Need to change any. All Available.
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« Last Edit: May 08, 2017, 05:17:58 pm by homefire »
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