Microwaves

This is one area of our hobby I have not done much with. 

I once borrowed a 23cm RX converter and did some tests one night with a homemade 4 el yagi in the room. I also, many years ago, made a 10GHz Gunn oscillator. I had the wrong sort of waveguide and, apart from some very short range tests, did not take it further. These days you can buy some very low cost wideband FM modules that all but eliminate the hard microwave bits. See https://www.amazon.co.uk/Aihasd-Wireless-Microwave-microwave-detector/dp/B00VVDFOHO/ref=sr_1_8?crid=3AXH2GP3143S0&dchild=1&keywords=hb100&qid=1621586561&sprefix=hb100%2Caps%2C180&sr=8-8

One of the things that put me off was the test gear.  I know some have fabricated homebrew measuring gear, but I found optical gear much easier to design, build and test.

The above link allows you to buy the HB100 units from Amazon within days for under £5 each. I am sure you will be able to get them cheaper.

Maybe I should have a go at 10GHz wideband FM?

UPDATE 0852z: A very quick look on eBay found these HB100 units on sale for £1.72 each with quite modest postal charges. See https://www.ebay.co.uk/itm/143788841984?hash=item217a7b9c00:g:VPEAAOSwY31a1FE~. If you buy more than 1 they are even cheaper!

UPDATE 1214z:   I have created a 10GHz webpage. See https://sites.google.com/view/g3xbm4/home/vhfuhfmicrowaves/homebrew/10ghz .