On 01/31/18 20:10, Mac A. Cody wrote:
A 23cm narrowband FM homebody transceiver By Michel Lips, PA7ML
I have been active on the U-SHF frequencies for several years as an ATV driver. For a long time I also wanted to work in phone on those high frequencies. Now you can buy a well-known brand transceiver and place a module in it to be radioactive at 23cm. No matter how beautiful these shopping boxes are, that is not the challenge of the radio hobby for me. With some research on Google I discovered the website of Bas, PE1JPD. There I found a kit for a 23 cm NBFM transceiver working from 1240 to 1300 MHz. The transceiver offers, among other things, simplex and duplex settings.
The problem with this design is that it uses the MC3372, which is obsolete. findchips.com shows that Quest and Bristol have a few, but not many.
One could replace this chip with additional mixers and perhaps a SA612-based FM discriminator.
--- Zach N0ZGO