ANTENTOP- 01- 2018 # 022

Broadband 50- MHz Antenna

Figure 5 Schematic of the Test Procedure for the Used Coaxial Cable

Used length of coaxial cable was connected to analyzer MFJ-259B and to 50- Ohm dummy load. Then it was checked SWR and Z in the range 2- 145 MHz. SWR should be 1.0:1.0 and Z should be 50 Ohm in the frequencies range if... if the coaxial cable is good. However what I discovered with some lengths of coaxial cable- it was increasing SWR beginning from 30- 40- MHz.

The system coaxial cable + termination load shows not 50 Ohm impedance. It was impedance higher the 50 Ohm plus lots of reactivity component. Of course such coaxial cable cannot be used for 50- MHz antenna system... Anyway I managed to found two good lengths of coaxial cable with satisfied electrical parameters.

Photo 5 Antenna on the net

www.antentop.org

Page- 47