This is one of my ex-satellite TV offset dishes with the feed arm at the bottom of the dish. Mounting the dish
this way requires a bend in the support mast. One consequence of this which I didn't anticipate was the tendancy
for the whole thing to lean over due too all the weight being on one side of the mast. To get the centre of
gravity back over the mast I had to add a 7kg counterweight (the grey box).
This is another offset dish that I'm currently using for my DB6NT 10GHz transverter.
As you can see, this one has the feed arm at the top which makes it a lot easier to
mount to the mast. I'm using an old LNB with the electronics removed as the feed.
This is a 60cm dish (F/D = 0.3) fitted with a WA3RMX tri-band feed for 2.4, 3.4 & 5.7GHz.
I checked the VSWR of the feed prior to mounting it in the dish and obtained the following results:
2.4GHz = 1.60:1
3.4GHZ = 1.56:1
5.7GHz = 2.70:1
I'm going to use this 90cm dish on 1.3GHz, 2.4GHz and 3.4GHz. I've made the three different feeds
using PVC pipe fittings which will slide onto the 20mm pipe fitted to the dish.
1.3GHz Feed
2.4GHz Feed
3.4GHz Feed
These horn antennas are for 3.4GHz and 5.7GHz. They are convenient to carry and deploy and are
quite sufficient for contacts over any line-of-site path.
Yagi antennas for 2.4GHz (coventional) and 3.4GHz (loop). These are also quite small and easy to carry around.
Yagis for 1.3GHz (right) and 432MHz (below). These two plus the 2.4GHz yagi shown above have all
been made using the T-Boom contruction technique described by Barry Miller (VK3BJM) in the
December 2009 issue of 'Amateur Radio'.
A panel antenna for 3.4GHz. This was salvaged from an old wireless data link. An aluminium 'foot' has been
fitted to what was the side of the unit so that the antenna can be stood to give horizontal polarisation.
60cm/120cm 5.7GHz tripod mounted dishes. I've added a short mast above the dish mount for other antennas.
The 1.2m dish for 5.7GHz with the 10GHz offset feed dish above
The 60cm 5.7GHz dish with the horn antennas on the mast.
The 1.2m dish for 5.7GHz with grid antennas for 2.4GHz and 3.4GHz plus a Yagi for 1.3GHz.
