G3TXQ 6 Band Hexbeam 40m single element add on kit
Some of you may remember the 7 band Hexbeam that was in production a few years ago. Due to the complexity of parts and time taken to make plus time vs profit the project was shelved until I could come up with something that could replace it and in some ways better it. After many months of testing, the new 40m kit is now available to retrofit to all my previously produced G3TXQ 6 band Hexbeams.
Advantages to the kit vs the old 7 band G3TXQ Hexbeam.
Weight, its only a few kg to add on to your existing 6 band G3TXQ Hexbeam.
Cost, you no longer need to buy a new antenna to get a 7 band G3TXQ Hexbeam, you just buy the kit.
Ease of build, it only takes approx 1 hour to fit the 40m element to the 6 band G3TXQ Hexbeam.
During the modelling of the 40m element I noted some significant points.
1. Due to the shape of the 40m single element free space EZNEC modeling is showing slight gain of 3.77 dBi over the 2.14dBi of a dipole in free space which is approx. 75% of a single Db, OK not a lot BUT it is gain over a dipole which is important.
2. With the base plate at a working height of 10m EZNEC shows the 15m element has increased its forward gain from 9.12 dBi to 10.35 dBi and the FB from 16.51 dB to 16.94 dB also the beam width has narrowed giving more rejection on the sides but forming lobes towards the rear.
3. With the plus points there is always a downside, due to the size and shape of the element it is unfortunatly narrow banded, approx 60 Khz below 1:5 100 Khz below 2:1 and 200 Khz below 3:1 so well within the range of most built in radio ATU's. You can specify which freq you would like the element centered at so you can enjoy the part of the band you favour.
These findings gave me the encoragment to pursue this project to the 6 band G3TXQ Hexbeam making it a very attractive addition to the already very popular antenna.
The 40m single element kit comprises of:
6 x spreader extension arms plus fittings
1 x vertical extension arm plus fitting
1 x high power (2KW) matching balun to enable direct 50 Ohm feedline connection
1 x 40m wire element
Turning radius: 4.1m
Forward gain in free space 3.77 dBi
Weight approx 3.5KG
40m Element Peak Gain shown over a dipole in Freespace Dipole in Freespace = 2.14dBi
40m Dipole 12m Above Ground
40m Element With Base Plate 10m Above Ground Element @ 12m Above Ground
15m Element With 40m Kit Baseplate 10m Above Ground
15m Element Without 40m Kit Baseplate 10m Above Ground