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
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.