Kapanadze and other FE discussion

[kolbacict]

What can be the parameters of such a filter? Frequency is approximately 1 GHz.

[stivep]

http://www.pe1rki.com/23cmfilters.html

attenuation on 950mhz 60db, on 1800mhz 80db and on the second harmonic 55db.
bandpass characteristic for atv tuned is about 0.2-0.25db loss in passband.
tuned to 1296mhz and with sma connectors i can go a little below 0.2db.

this filter is already in use at many many ssb stations around the world.

i also have a filter that filters 950 and 1800mhz a bit worse but will have 0.15db loss.
i remember i made this filter only once but i lost its specs but it was very low loss.

for tuning filters i use a very expensive vector network analyzer from hewlett packard.
rigol and signal hounds and simular network analyzer equipment do not come close to
the accuracy of hp. so beware, do not retune my filters, you can actualy make it worse without knowing it.
i have even seen several times that the rigol actualy shows a filter making gain instead of loss...

Cavity Filters. Cavity filters are one of many types of Radio Frequency (RF) filters, and are one of the fundamental building blocks of modern communications systems.

http://www.amateur-radio-wiki.net/index.php?title=What_is_a_cavity_filter%3F
https://www.youtube.com/watch?time_continue=489&v=QavRKwectm4
https://www.youtube.com/watch?time_continue=1&v=CBx5Xz1v0J4
https://www.youtube.com/watch?v=sM2ltv7x0zA
https://www.youtube.com/watch?v=PLMziyM7EgQ



Wesley

[kolbacict]

wonderful. And then my compatriots got water in their mouths. are silent.

[stivep]

https://youtu.be/XOTLfnMOSqQ
Free Energy   extraction from Schumann waveguide


Wesley

[stivep]

Information  about coil  I used as transmitter is here
second picture  method of   tuning Tx to create surface wave:
correction- changing elevation of sphere  adjust wave tilt angle  and polarization in   respect to earth air interface
more is here- https://youtu.be/XOTLfnMOSqQ?t=601

Wesley