Cavity Back Dish feeds for 3.4 GHz

[ZL1SWW]

Hi All,
I found a posting on the VK logger about cavity back dish feeds by Andy VK3ES. I am looking to streamline my contest station a bit and have been using a deepish dish with a loop feed but with the radome etc, makes for quite a heavy and bulky dish. It was an Ericsson 60 cm dish from a minilink system.
I have an old C series dish that is lighter and would like to have a system where I can screw on a dish feed with an N connector at the dish centre. I do this on 5.7 GHz with good success. Means everything can pack down flat in the car relatively nicely. 7 microwave bands in the car gets a bit tight!

Had a bit of a google around with little success. Hoping that someone knows the link to the construction details especially for 3.4 GHz.

Any info gratefully accepted.

73, Simon
ZL1SWW

[VK3ALB]

VK3ES Cavity Backed Dipole Dimensions 9cm.pdf

(83.54 KiB) Downloaded 319 times

VK3ES Cavity Backed Dipole Dimensions 13cm.pdf

(83.51 KiB) Downloaded 297 times

VK3ES Cavity Backed Dipole Dimensions 23cm.pdf

(21.71 KiB) Downloaded 358 times

[ZL1SWW]

Thanks Lou,
Most appreciated. Looks like some others wanted it too judging by the download count.

Cheers,
Simon
ZL1SWW

[VK2ZIW]

How can we make the feed a crossed dipoles arrangement for circular polarization?

My thought, loop dipoles formed with 1/4" hard line or coax loli-pop style. Feed opposite the stem.
Cavity will have to be supported by non metallic something.

Alan VK2ZIW