[Lowfer] 8820 Hz question - maybe OT

[Mitch Powell]

Hi Mike:
Great discussion - helps clear the mind -and start reading some of the
material all over again. Check out

http://en.wikipedia.org/wiki/Project_Sanguine

and Project ELF, which is the Michigan portion of the ULF transmission
program of the 60's.

In a totally practical vein - I might add that I have a box of small
receiving type mica capacitors - from 50 pf up to 1 uF.
The approximate inductance of the vertical loading coil ( or the 50 ft loop
) might be approximately known so I would use these small capacitors and
clip to the coil or loop and use the receiver as an indicator of resonance.
Someone has already suggested this before, I believe. It really works well
- and I used this with both a 50 ft vertical ( base-loaded inductance) and
with the series tuned 340 foot loop I presently use. Then I replaced these
components with the higher voltage components with final recorded value -
along with a high-voltage variable for fine-tuning - and there it was -
current peaked . swr was excellent and rf appeared !  Very sharp tuning by
the way - only kilocycles.
Just a simple - practical method - and even the original calculations were
confirmed.
73
Mitch

On Wed, Dec 3, 2014 at 8:16 AM, N8OOU <n8oou at meekfarm.us> wrote:

> JD, Bill, and others;
>
> Thank you for contributing more explanation to help my physics knowledge.
> Even though I am an old guy who should know and understand this stuff, some
> of the old things I thought I understood, have been incorrect. It's not
> easy replacing my 50 yr concept that audio frequencies live in a magnetic
> world contained by metal, ultrasonic is a gray in-between world, and
> anything above is electro and radiates.
>
> Yes, I do now understand from your replys, that resonance of the antenna
> wire is the answer to my question. I just need some time to adjust my old
> concepts.
>
> Thanks
>
> 73   de   N8OOU - Mike Meek
>
> On 12/02/2014 11:51 PM, JD wrote:
>
>> what are the conditions or parameters for a signal like 8820 Hz to
>>>>> change from being contained in the magnetism of a transformer or
>>>>> speaker voice coil to being radiated from an antenna?
>>>>>
>>>>
>> You are correct that there is no magic frequency for EM radiation to
>> occur, as illlustrated by the example Doug gave.
>>
>> The one absolute condition for radiating an electromagnetic wave at
>> radio frequencies is being able to accelerate charge carriers.  We do
>> this by pushing RF current through a conductor (the antenna), causing
>> electrons to accelerate first in one direction, then the other,
>> repeatedly, for the duration of the transmission.  That's pretty much it.
>>
>> Of course, that's also the challenge...getting enough of that current to
>> flow, and not letting the current be balanced by another current
>> accelerating electrons in the opposite direction within the same plane.
>> The lower the frequency, the harder it is as a practical matter to get
>> current to flow at all in a short Marconi antenna because of all the
>> reactance that must be cancelled; or to achieve sufficient separation of
>> the sides of a loop antenna to prevent most of the signal from
>> cancelling itself.
>>
>> John
>>
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