[amsat-bb] Potential 23cm FM transmitter

[Brad Brooks]

I had a brief email exchange with Bas PE1JPD. He confirms the step size is indeed 25KHz but is investigating how to produce a 5KHz step.

He has been quick to respond, and I would encourage anyone who has questions to review his site and ask questions via email to him.

http://www.pe1jpd.nl

73 Brad WF7T
EM66

On Feb 1, 2018, 2:09 PM -0600, Zach Metzinger <zmetzing at pobox.com>, wrote:
> 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
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