Quote:
Originally Posted by ANDREAS
for J_P
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?
A generator can not have the capabilities we want. Grounds generator with high voltage output, will probably be better. Even better a proper antenna design can have better performance. I start designed a new antenna (in my spare time) and I'll see what can be done
Also, your what instrument did you use to detect the ground signal from a distance?
I have a old VLF receiver (1KHZ-100KHZ) unknow firma (maybe military) with panel a field meter and a big-big external feritte antenna. For detection signal i use antenna-feritte vertical place and measurement via field meter
Best regards
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Hi Andreas,
I agree with you, I think you will find better distance if you use a higher voltage at the antenna.
My thinking is an RF power amp maybe 10 watts can be used to guarantee the 10 watts is available to the antenna at all frequencies.
I can also see it would be good to raise the voltage using a transformer to deliver higher voltage to the antenna and ground.
When you first presented your flat top antenna, you said :
"This antenna invented before 1920. The flat-top antenna functions as a monopole antenna with capacitive load.
...Anyone who wants to build this, follow the instructions to obtain a generator that actually carries the signal into the earth".
This is how I recognize this design to be based on the multiple loaded flat top antenna that was used in the early Marconi broadcasting stations in 1919.
This design was actually adapted from Nikola Tesla's patents for sending power to the ground.
I see your modification of this antenna is even simpler than the Marconi design.
But now you are talking about making new modifications for a proper antenna, so I am thinking you will modify to stop if from acting as single-wire ground transmission which Tesla designed.
It sounds as if your are planning to change it to become an antenna to broadcast more than 5% of the power into the air as RF broadcast.
If you do this, then I expect the ground power transmission will diminish, as more power is broadcast into the air.
In the VLF and LF bands, a large amount of this RF power radiated from the antenna will still penetrate the ground after passing through the air.
But if my idea is mistaken, then maybe you will be making modifications to the antenna for better power transmission to the ground.
If this is what you are intending to do, then I can see some possible mods which may bring this design closer to the original design which Tesla made to allow good power transfer to the ground.
In Tesla's designs, he used a resonant transformer to increase the voltage that is sent to the transformer.
But if we are to use a DDS generator to produce many different frequencies for testing, then we will not be able to use a resonant transformer, because the transformer will be resonant only at one frequency.
So it appears that if this scheme is used, we can only use a step-up transformer, which will probably not be resonant.
Still, we can find better ground penetration with a higher voltage.
I wait to see if there are modifications made by you or other readers.
See below for a schematic diagram of the Marconi Flat top antenna and some links for further reading:
http://www.tuks.nl/wiki/index.php/Ma...fWirelessPower
http://amasci.com/tesla/tmistk.html
http://www.teslauniverse.com/nikola-...sion-of-energy
http://www.teslauniverse.com/nikola-...sion-of-energy
http://www.teslauniverse.com/nikola-...ctrical-energy
Note: These are not schematics for construction. They are only general diagrams to show basic concepts.