VLF Reciver

[Sneshko]

Dear friends!
Please electronics specialists and experienced members of this forum to establish their pattern of VLF receivers that should have the following characteristics:
- Power supply - 9V;
- Antenna - Telescope;
- Compact;
- Band Selector:
ELF (3Hz-30Hz);
SLF (30Hz-300Hz);
ULF (300Hz-3KHz);
VLF (3KHz-30KHz);
LF (30KHz-300KHz).
Does anyone have this shematic of VLF Reciver?
Do any of the more experienced electronics can create such a VLF scheme Reciver and placed on this forum?
Hoping not to ask too much, all the members of this forum I wish good health in the new 2012th year!!!
Regards!
Sneshko

[WM6]

Originally Posted by Sneshko

Dear friends!
Please electronics specialists and experienced members of this forum to establish their pattern of VLF receivers that should have the following characteristics:
- Power supply - 9V;
- Antenna - Telescope;
- Compact;
- Band Selector:
ELF (3Hz-30Hz);
SLF (30Hz-300Hz);
ULF (300Hz-3KHz);
VLF (3KHz-30KHz);
LF (30KHz-300KHz).
Does anyone have this shematic of VLF Reciver?
Do any of the more experienced electronics can create such a VLF scheme Reciver and placed on this forum?
Hoping not to ask too much, all the members of this forum I wish good health in the new 2012th year!!!
Regards!
Sneshko

Hi Sneshko,

if you really want to receive something on those bands, then forget on telescopic antenna:

1st reason: you cannot tune usual telescopic antenna to most of mentioned band (conditionally on 300kHz).

2nd reason: telescopic antenna is not directive antenna so worthless to detect something in some direction.

But if you need only a virtual receiver, then telescopic antenna without any circuit will be enough.

On lower bands you need a huge filtration to not be disturbed by power line (50Hz and its harmonics). On higher band you need signal down-conversion if you wish to get hearing audio.

What sort of antenna then you need?: Air coil antenna or better ferrite core antenna.

But you can build broadband receiver covering all your bands as you can read here:

http://www.techlib.com/electronics/VLFwhistle.htm

Again: to detect direction of incoming signal, you need directive antenna which telescopic antenna is not!

[WM6]

You can modified circuit presented here:

http://www.longrangelocators.com/for...ad.php?t=18419

this way:

[Sneshko]

Bravo WM6!
That's about it!
You and other forum members good health and all the best in the new 2012th year wishes
Sneshko

[WM6]

If you insist, you can still connect, without harm or tangible benefit, additional telescopic antenna this way:

[detectoman]

these circuit semms ok, very simple anybody build this?

[detectoman]

happy new years guys! jaja

[J_Player]

Originally Posted by detectoman

these circuit semms ok, very simple anybody build this?

Yes...
This is a basic VLF receiver which will tune a big range of VLF frequencies without difficult filters to keep narrow bandwidth.
This is exactly what LRL experimenters want... ?
A tuner that will tune VLF frequencies and will also tune RFI interference and 50-60Hz hums, and other external noise, including treasure noise?
The best part of this design is it is easy to build, and it works for experimenter purposes better than difficult tuners with notch filters and other circuit enhancements that cause the tuner to receive only the frequency that is selected.
What more could an LRL experimenter ask for?
The only improvement would be maybe a goose that lays golden eggs... ?


Best wishes,
J_P