This was my first attempt at making a “Patch of the Year” dual-band 2.4GHz circular and 10GHz linear feedhorn.
I used 1.5mm brass sheet and 22mm copper pipe, with a brass adaptor to fit a “Red Rocket” LNB.
Boring the centre holes – the brass is painted with red marking fluid 
Custom mandrel 
Reflector mounter on the mandrel 
Mandrel bolted up 
Mounted in a collet on the lathe 
Front attachment ring for the Red Rocket lens 
Mounted the N socket on the back of the reflector 
N connector in place 
Trial fit of the driven element 
Assembled nd ready to solder 
Removed the lens from the LNB with hot water 
Naked LNB – the ring at the end was chopped off square 
Tapered stainless steel pin for expanding mandrel 
Split mandrel made from Delrin 
Expanding mandrel assemb;led 
Mounting the soldered-up feed to spin and polish on the lathe 
Adaptor collar to fit LNB to 22mm tube 
Inside of the collar is tapered to improve the match and remove any discontinuities 
Adaptor with copper tube and LNB in place 
Soldered the element, reflector, adaptor, socket and front ring 
I made an offset mount as otherwise the reflector fouls the feed arm 