Quote:
Originally Posted by Fred
There is two coils on two ferrites cores in the same axis separated by a "crititically adjusted" gap.I am not sure if both coils are wound on the same core or not.
regards,
Fred.
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Oh yes!? I havent spotted that!?
But if was like that, still i dont see reason for making gap between "active" and "passive" core? Making a gap will cut out induction which supposed to flow through cores. Cores are generally used to improve induction, to boost it not to stop it.
That particular stage is actually a big question. The rest of schematic is pretty clear.
I still think that stage was added in existed design by experiment.
When experimenting, discovering new things, man can easilly do some things pretty wild, without following previosuly planed routes.
It is so hard for me to make guesses here without having device and measure
some values in vivo.
According to what i do know, direct receiver will receive raw signal produced in its vicinity. In this case, eventual distant signal will be absolute masked by field produced in coils, if coils and ferite rod are close.
I still dont have a clue how coils and rod are oriented?
I remeber once Ivconic and me argued about ULF and its eventual use in lrl.
I can give a hint here (once gave to Ivconic) how to make very efficient ULF antenna, in manner to suggest you to replace existing ferrite rod antena with new one and than see changes;
well...
take 12 ordinary ferrite rods, 100mm x 8-10mm. Glue those togather and make one fat rod, 20cm long and 6x1 rod fat.
Wound 600 windings 0.2mm wire, isolate it very good, wound 450 over those 600 and isolate again. You will have 4 ends. End of 600 and start of 450 solder togather and you will have 3 wires than. Use it instead this one and see changes.
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