Friday, October 29, 2010

Wednesday, October 20, 2010

DV4080 HF VERTICAL 40M/80M DUAL BAND

Type : HF Vertical
Resonance Freq : 7.08MHz & 3.85MHz
SWR : <1.7
(tested on a Single Radial on each band not trim)
total height : 10m
freq : 40M and 80M
Power rating : 200W PEP Max

40M band Coil

 80M band coil and capacitor.


Sunday, October 17, 2010

D3E20 3 element yagi for 20m band

Type : 3 element yagi
Resonance Freq : 20m band
Center Freq : 14.200 MHz
SWR : Less than 1:1.2
Gain : 5.35 dBd / 7.5 dBi
F/B Ratio : 25 dB
Weight : less than 15Kg
Boom Length : 5.6 meter




D1E1740 Dual-band Rotary Dipole.

Type of antenna : rotary dipole
Resonance Freq : 17m and 40m dual band 
Center Freq : 7.070MHz and 18.100MHz
SWR: less than 1:1.2 
Total weight : less than 5 Kg
Total Length : 15 meter (End to end)

The rotary dipole was 
under the 4 element yagi ,
no guy wire needed .

Coil made from 3mm aluminium wire ,
13 uH per coil.