Quote:
Originally Posted by ANDREAS
Thank you J_P
As I write, I became a single building prototypes for client.
Measurements were made on soft ground without water.
Ground Needle put ground with water and salt
With 8 W RMS amplifier at frequency 10 kHz signal "lost" in 40 meters
distance
Frequency of 1 kHz 30 meters distance
Frequency 15- 20 kHz maximum 10 meters distance
Frequency >20KHZ maximum 4meters distance
It's logical . Generator use with a output stage a amplifier TDAseries
This is audio amplifier and can not signal gain > 20 kHz
With freq >20KHZ work only standard (auto - select) output stage signal 200mv AC from generator
My opinion... with multiplication loops first plate and second plate work as reflector can go longer distance
I believe with output stage FETs power push-pull is better.
Interest here. My customer after experiments believe the generator has range 500 meters distance!!!!!! I am not dowser... i have not opinions for extreme range
Best regards
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Hi Andreas,
The distances which you measured seem very interesting.
We do not find these same distances when we use a simple pair of ground probes as we see from typical MFD apparatus.
This makes me think this is a very interesting antenna for MFD users and dowsers to make experiments with.
Of course, you are correct. TDA series is for audio amplifier, and will not send good signals more than 20 KHz.
But we see most MFD users are interested to send audio frequencies, so TDA can work for these experimenters.
To send higher frequencies, I agree, you must have an amplifier with faster output stages to give a clean signal.
Better to use RF amplifiers.
Now, I have one final question.
When you made your distance measurements, what voltage did your DDS generator send to the antenna?
We know it was only 20 mv at 20 KHz, but what voltage was the antenna at 1 KHz and at 10 KHz?
Also, your what instrument did you use to detect the ground signal from a distance?
Best Wishes,
J_P