Here are some explanations about the antenna data.
- Diameter plastic tube for the antenna is 110- mm.
Standard row for the tube is: 75, 110, 165, 215- mm.
If we take tube with smaller diameter 75- mm we get twice decreased
Pass Band and twice increased turns in the inductor (so, losses
in the inductor also highly increased). If we take tube with bigger
diameter 215- mm we get twice increased Pass Band and twice decreased
turns in the inductor (so, losses in the inductor also decreased).
Good parameters, but antenna is too bulky!
|
2. Diameter of the wire in the inductor is 0.85- mm
(20- AWG). It is compromise variant that depends on power (10-
Wtts allowed in Russia) allowed for using and losses
in the inductor. For bigger power it needs to use wire with bigger
diameter.
3. Copper foil is 0.05- mm in the thickness. Thickness
of the using copper foil for the EH antenna depends on power going
into antenna and to mechanical strength of the foil. 0.05- mm
foil should be enough for the antenna.
4. Length to the cylinder diameter is 6. I took the
digit from my experience. If the digit less the 6 the Pass Band
is decreased. If the digit more the 6 the antenna design going
to be complicated.
|