Viewmaster wrote:You seem to be getting the KOWKOW tin machine bug, Harry.
I am very curious if it would work for NBTV never know .....
i would never have thought before i tried it hooking a solar cell to my lap top mic input and transmitting NBTV video via a led and getting a working image would work but it does .
Although going crystal gives a better chance it's getting away
from the purity of the genuine KOWKOW machine.
Crystal can be two way though, just like the kids toy.
Just an idea what ever you do i would do a frequency sweep test on it ,i am thinking it would be very touchy on the wire string tension...
You need some thing either end to make and receive the vibrations ..could go passive or active device here but also need to turn the signals back to electrical signal ..so stuck with active .....
If you are going traditional tin can may a membrane like a balloon rubber stretched over the end might help .
Pulling the wire tighter in the original KOWKOW will lead to
attenuation of sound but better HF transmission.
Need to test this idea Albert need to do some science again a Sweep test will show if this is so !
You will not be able to pull if using a non KOWKOW crystal earpiece,
of course.
The true KOWKOW being a loudspeaker at one end and mic at t'other.
If a speaker is used a tweeter has a range of 2,000 Hz to 20,000 Hz thats a nice band width i would think some amplification would be needed.
A good mic can do 20hz to again 20khz ..
Problem how to you stop it pick up the air transmitting and receiving ...perhaps enclose them in a sound proofing container ?
The transmission media (ain't we getting posh
) , a stiff
wire with crystal, will not suffer any
tension transmission attenuation,
as a stretched wire will.
mmmmm may be so !
Do you like the KOWKOW expression, " tension transmission attenuation, Harry?
[/quote]
Yes i do Albert ! I have always said i like your device naming you are good at it indeed !
BTW on the Gilbert kits ...i was watching the Americam Pawn Stars show and a lady was selling the
Chemistry set it was dangerous ! heres the link to the you tube video of it
https://www.youtube.com/watch?v=sUDv6EaYciUAlso BTW i have a PM to you perhaps your inbox is full ,,,happens to me all the time
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.