[amsat-bb] Potential 23cm FM transmitter

Zach Metzinger zmetzing at pobox.com
Thu Feb 1 20:09:08 UTC 2018

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The problem with this design is that it uses the MC3372, which is
obsolete.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

One could replace this chip with additional mixers and perhaps a
SA612-based FM discriminator.

--- Zach

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