HY-GAIN - 18AVT antenna - renovating

For the moment - June 2005 - only 4 band is mounted.

My decision is, that the antenna must work in the CW-bands.

 

 

 

 

 

 

"Maybe just a little more height and a little more GAIN!"

7 MHz

This have to be longer.

Resonance must be 30 KHz lower.

 

14 MHz

This have to be shorter.

Resonance it 14.025 MHz, but have to be abt. 14.50 MHz.

21 MHz

This have to be longer.

The resonance is 21.135 MHz but must be changed to 21.50 MHz.

28 MHz

This have to be longer.

Resonance is 28.928 MHz but must be abt. 28.250 MHz.

This is the major problem.

 

Renovation of the antenna have shorten the coils. This is because of some corrosion inside the coils - made of aluminium wire. The original aluminiumpibes is not long enough to give resonance where it shout be on 10 meter band.