Using these circuits will give a reasonably Good system.
A Better System can be obtained for Much more Money.
So it depends on what you want.
I use Individual Circuits for the Spkr to Mic, Preamp, power amp and filter.
This allows for easy changing, if you are not happy with any one of them.
Weither you want a Parabolic Dish or a Shot Gun Type of Mic,
the electronics is Basically the same.
My Experience with Shotgun Mic's is not that good. I prefer the Parabolic.
Parabolics should be at least 18 inches in diameter for this purpose.
Smaller diameters don't work very well.
However "This Preamp is Quite Suited to Dynamic or Electric Microphones".
Any Type of Microphone can be used, But I prefer using a speaker as a Microphone.
It has more surface area and typically a reasonable frequency response for this
particular application.
For a better setup, Use a Large parabolic as your main dish and a Small parabolic
behind the Mic. This Smaller parabolic catches any signals that are missed and
reflects them back into the main dish. Additionally, put the mic in a tube so
that Wind coming in from the sides does not hit the microphone.
"Go To My Home Page"
A Typical Small Satellite Dish.
IMPORTANT NOTE: See the Recieve Angle.
Although these dishes are readily available,
This Angle can be a nuisance in Aiming correctly.
Preamp Schematic.
Preamp PCB.
Preamp Picture Overlay.
Parmetric Filter Schematic.
Parametric Filter PCB.
Parametric Filter Picture Overlay.
Power Amp Schematic.
Power Amp PCB.
Power Amp Picture Overlay.
Speaker as a Mic Schematic.
Speaker as a Mic PCB.
Speaker as a Mic Picture Overlay.
A 5 Foot Satellite Dish.
This one is a 90 degree Focus Angle.
A 32 Inch Satellite Dish.
This one is about a 75 degree Focus Angle.
A Mirrored Glass Parabolic Dish.
A Signaling Mirror From A WW2 Distroyer. Viewing Distance greater than 2 miles.
Made by "Bausch & Lomb" Excellent Optical Qualities.
All Imformation in this Article is "Copyright protected".
Chemelec *Copyright © 2004*
