VLF null and frequency

[dbanner]

Clue: Nautilus circuit is known for incredible depth, while maintaining stability. Not a coincidence that tx and Rx are close together. This jives with your observations. Conclusion, take Nautilus phase shifters, apply to tgsl, now balance tx and Rx at closer resonant frequency, realize greater depth of detection.

[dbanner]

Series resonant Rx: Serbian most wanted detector Rx.SMW. schematic here on forum.

[manhunt47]

thank you

[manhunt47]

then give just direct links.

thank you kt315

[manhunt47]

Nothing has been removed.
I suspect you have copy and pasted photos that exist only on your computer, and therefore they're not visible to anyone on the forum.
To correctly attach files to your post:
1. Select "Go Advanced".
2. Select "Manage Attachments".
3. Then select "Add Files", browse, and upload.

thank you Qiaozhi

[manhunt47]

Clue: Nautilus circuit is known for incredible depth, while maintaining stability. Not a coincidence that tx and Rx are close together. This jives with your observations. Conclusion, take Nautilus phase shifters, apply to tgsl, now balance tx and Rx at closer resonant frequency, realize greater depth of detection.

Hello dbanner
Can you give me more detailed information about this device Nautilus?
For example, TX and RX frequencies as well as loop inductances
Because I could not understand the behavior of this device

Because you are here to point out that the TX and Rx frequencies are very close and the device has a good depth and is stable.

[kt315]

RX part of Nautilus coil has pre-amplifier on transistors. this small trick gives all advantages.

[manhunt47]

RX part of Nautilus coil has pre-amplifier on transistors. this small trick gives all advantages.

Do you have a snapshot of this design?
To simulate it

[manhunt47]

RX part of Nautilus coil has pre-amplifier on transistors. this small trick gives all advantages.

Do you have a snapshot of this design?
To simulate it

[kt315]

https://dfiles.ru/files/au0qyjdqg?redirect

[manhunt47]

https://dfiles.ru/files/au0qyjdqg?redirect

Thanks kt315

[manhunt47]

https://dfiles.ru/files/au0qyjdqg?redirect

I have read all the data you sent from the Nautilus device, but I did not get any information about the values of the RX and TX Coil inductances.

[kt315]

you have a generator (sorry i do not remember a call of this type of generator, we call ТРЕХТОЧКА) with
known frequency and known capacitor value. take a formula of classic resonance and calculate.

[pustareka]

http://kamrad-club.ru/-razdel-master...aquasound.html https://www.geotech1.com/forums/show...446#post254446

[dbanner]

I too couldn't find accurate technical information on Nautilus coil Rx resonant frequency, until I read the Nautilus patent author Jerry Tyndall.
You see therein contain details/data on coil, enough to ascertain what Jerry was up to. Then I realized that the Nautilus DMC 2b coil was most likely bifilar design with tx an Rx freq, closer together(somewhere around 14khz). The circuit architecture was very much the standard for motion VLF, so why was the DMC2b winning competition events, and got tremendous success and reputation for deepseeker?
Four elements, firstly, transistor preamp in coil housing.
Secondly, balanced coils in full resonance.(bifilar centre tap TX design with dual buck coils)
Thirdly, a third all metal channel running side by side with motion discrimination, with it own separate audio.
Fourthly, adjustable tx power.
The only differences I could find from say the tgs circuit( besides unique side by side all metal channel) were in the phase shifting, and the coupling to the switches(gates)4066.( Normally with series resistor and cap to ground, in the DMC2B it was capacitor in series and resistor to ground)yet another clue for stability.
Everything else was like silver sabre plus, which ain't a deepseeker by any means!!
Of course the final big difference was the coils being in closer phase, requiring R and C balance pots to fine tune the null before hunting. This I believe is what closer resonance spread does, it requires very fine balancing to achieve stability.