Building a Septum Feed for 23cm

The two sides are guillotined and folded on a Brake Press. The Septum is cut from sheet and

filed to the exact shape detailed by OK1DFC. The two monopoles are turned from 6mm

diameter Brass and cut to approximately ¼ wavelength, these are adjusted for the best return

loss later.

The two tuning capacitors in the back plate have very little effect on the tenability of the feed and

can be left out without any detrimental effect.

The Choke can is cut from sheet and the outside ring is cut and shaped as shown. It is then

riveted to the base plate using Blind rivets. The choke can is then bolted to the feed and

grounded to the waveguide in as many places as possible.