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.
73 Brad WF7T EM66
On Feb 1, 2018, 2:09 PM -0600, Zach Metzinger [email protected], 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The problem with this design is that it uses the MC3372, which is obsolete.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 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb