|Coil part and mounting mechanism.|
|The feed point.
The horizontal elliptical --22cm*13cm-- gray cable is the feed loop.
The other one is for the motor in the opposit shell:
+9V from the black line to white one (behind the coil) means "up;" while +9V from the white to the black means "down."
I had to shorten the coil by 1cm (or 1/2 in) to tune the anntena for 21MHz band.
The capacity is
- the minimum, at his highest frequency (21MHz); and
- the maximun at the lowest (7MHz).
"+/- 9V" DC is fed to drive the motor through the gray cable.
|The diameter of the VC is about 12.5cm (5in).|
|The VC is composed of alminium blades.
The hook is installed on the shaft as a stopper (see below).
|The main board has two stop switches for each rotative direction.|
|The motor. It includes a geer box inside.
This motor made by "Hankscraft Motors" includes total 6-stage gears inside the black case and provides 0.5rps @12V.