Canvey Island, Essex, England Justin@g0ksc.co.uk
Twin boom quad
144MHz LFA Yagis
144MHz LFA Yagis

Low Noise LFA Yagis designed by G0KSC free to build for personal use.

144MHz LFA Yagis
70cms LFA Yagis
70cms LFA Yagis
Twin-Boom G0KSC Quads
G0KSC Twin-Boom Quads
Twin-Boom G0KSC Quads
G0KSC Custom Dish feeds - Above installation @ HB9Q
Custom low-noise dish feeds
Custom low-noise dish feeds
G0KSC Custom Dish Feeds

Above installation @ HB9Q

G0KSC Custom Dish feeds - Above installation @ HB9Q
previous arrowprevious arrow
next arrownext arrow
 
Read Time: 2 - 3 minutes

K2LZQ installs 4 x 6m 7el LFA2s for EME

 

Being a leader rather than a follower means K2LZQ gets to pioneer the best of the best for 6M EME. Unlike many that would opt for antenna brands designed as long ago as the 1980's, Craig K2LZQ decided to take a 'leap of faith' and install 4 of the 8.9m long 7el LFA2s which are the first commercial 6m Yagis to employ a bent reflector for enhanced F/B ratio. Not only this, Craig took advice to stack the LFAs 'correctly' rather than using DL6WU forumlas (which so many HAMs do), which can result in huge side lobes, particularly within a 4 bay array.

Updated comments from Craig:

Good morning Justin.

The array is very quiet. I have a line noise issue (will be fixed next week). As compared with the 9 element Force 12 on a tower 100 feet away there is a 2 S unit difference in the noise (array better).......

So far so good.. Well Done Justin'

A later mail:

'..Hi. Just checked the SWR across the band. 50.0 – 50.5  is 1.1:1 and up to 51.0 is 1.2:1.

Hard to believe.. Good show...'


The 4 bay 6m array at K2LZQ

 

Craig wanted to step away from the pack and try something a little different and after seeing a presentation on the LFA antennas given by G0KSC at the 2009 6m BBQ in Texas, Craig decided his step would be in the direction of the LFA. Mike, WA2VUN who installed the array on behalf of Craig had simply this to say: 'Dang! they work GOOD''

Additionally, Craig decided to take no chances and opted for the many years design and build experience in building antennas of Force12 by ordering his LFA2s from the Texas based manufacturer. Below are the Azimuth and Elevation plots of this array. Don't want anything off of the sides? This is the array for you!

 

 

The Azimuth plot of the LFA2 4 bay array at K2LZQ


 

Finally, the Elevation plot of this revolutionary array

 

It is important to note that while the above plots have been taken at 50.150MHz, the antennas gain remains constant from 50.150 to 50.250MHz droping by just .01dB at 50.100MHz and 50.350MHz with a further tail off of .02dB at 50.000MHz and .07dB at 50.500MHz. So again unlike other antennas, the gain is constant across the whole band along with a low, flat and wide SWR curve ensuring a constant 50Ohm feed impedance which results is more radiated power and less feeder losses.

The LFA2 is just one of the G0KSC antennas manufactured by Force12 in the USA. There are many approved manufacturers around the World now making and marketing G0KSC antennas but as always, in the true spirit of HAM radio, all information is available on this site to build your own!

 

 

73

Justin G0KSC