Ferrite antenna: Is the signal pulled in like a magnet?

[Mike(Mont)]

I'm still vague on all of this. I thought the Gold Gun uses the null to locate the target.

Since I'm on this, what is the advantage of using a long thin ferrite rod versus a shorter, fatter one? Is it just a cost (save money) issue?

[WM6]

Depend on its circuit building and tunning, GG circuit can detect by nulling signal too. Not sure how original one work, I haven't one.

With longer thin ferrite rod you get more directive antenna to more precisely point at target location, with shorter and fatter one you get more sensitive (more gain) antenna to sense weaker signals.

[Mike(Mont)]

Depend on its circuit building and tunning, GG circuit can detect by nulling signal too. Not sure how original one work, I haven't one.

With longer thin ferrite rod you get more directive antenna to more precisely point at target location, with shorter and fatter one you get more sensitive (more gain) antenna to sense weaker signals.

Okay, thanks for that. I feel like the short, fat one gives cleaner signal but sensitive to direction. The thin one seems noisy but it's a lower permeability.

Pretty sure the Gold Gun and AGR receiver use the null to locate the target by pointing the end of the ferrite rod at the target. They look for a drop in the signal or whatever it is, background noise?

[WM6]

It is always problem how to distinguish between useful signal and all sort of environmental interference signal (including useful signal unwanted reflexed from objects around our location).

The only primitive (conditionally) solution is to build extremely directive antenna that can receive (practically) in pointed direction only and by this suppress all other sources of signals. Or we need to go more sophisticated and expensive way to digital filtering and selecting useful signal out of signals cacophony.

[WM6]

Okay, thanks for that. I feel like the short, fat one gives cleaner signal but sensitive to direction. The thin one seems noisy but it's a lower permeability.

Solutions to more directive antennas are known.

We need to use two or more antennas (instead one only) in parallel, at given distance between them and follow phase of each one to get equal balance (which mean "null" direction). Unfortunately, to get practically applicable device, we are here limited to suitable wavelength (shorter wavelength mean more useful/practical construction of our device).

GG follow such directivity idea, but with "in-line" design of two ferrite antenas instead of two parallel placed at adequate distance. Such "in-line" tuning could be more critical.

[Mike(Mont)]

Okay, I didn't see the GG that the two ferrite rods run to separate circuits. AGR Receiver probably the same.

[Mike(Mont)]

Okay, thanks for that. I feel like the short, fat one gives cleaner signal but sensitive to direction. The thin one seems noisy but it's a lower permeability.

Pretty sure the Gold Gun and AGR receiver use the null to locate the target by pointing the end of the ferrite rod at the target. They look for a drop in the signal or whatever it is, background noise?

When i say the short ferrite rod is "sensitive to direction" I mean it is like aiming a pistol compared to a long barrel rifle, it's harder to aim. Definitely not the same as the long thin rod. I need more time with it, just got it wound last night. But so far I like it better.

[taxma1981]

with small ferrite i have gut signal

[WM6]

Okay, I didn't see the GG that the two ferrite rods run to separate circuits. AGR Receiver probably the same.

Your do not need separate circuits, only separate antennas driven by same circuit. Something like Dual or Quad Yagi antenna. GG is pure VLF radio device with two separate antennas proper mutual equilibrated.

with small ferrite i have gut signal

No doubt. With short fat ferrite antenna you receive a lot more different signals, than with long directive antenna. Question is what use of all those "gut signals". Did you take a look at spectrum of all those signals in spectrum analyzer? Try and you will see what a mess you receive.

[taxma1981]

6 vlf station:χαχαχα:

[taxma1981]

and one example with not ferrite antenna,box 1 with gold and silver,box 2 with paper

[taxma1981]

i use gold gun with fm transmitter and receiver

[Mike(Mont)]

I guess it depends on the receiver, but that's just a guess why it works better. At least it appears so with my test targets. I know you won't be happy with this answer, but...That's my story and I'm sticking to it.

[WM6]

No doubt, receiver is important, but don't forget: antenna is always part of receiver.

[taxma1981]

The antenna make the diference