Reverse Engineering the Zycomm FM5016 and the Phase Locked Loop
Reverse Engineering the Zycomm FM5016 by G4XRA and M9IPM
Here are several articles describing our attempts to convert some old 1980's radio telephones to the 2m band and how it became an exercise in learning about early Phase-Locked loop technology.
Note: The links below connect to an external dedicated webpage for this Project. Once in the external page, there are navigation links to many seperate articles.
The story starts when M9IPM & G4XRA went to the Dunstable Downs Radio Club Bootsale and were given three old Zycomm FM5016 VHF mobile transceivers.
We were hoping to convert them to work on the 144Mhz 2m band. Two sets were looking servicable and a third was received as a spares donor .. .. More...
Searching for Information
Due to the age of these radios it proved very difficult to find any information whatsoever about the radio from the Internet. The articles have been created to document our journey into the world of 1980's radio .. .. More...
Reverse Engineering Phase locked loops
Retuning the radios involved having to learn a lot about early Phase-Locked loop technology .. .. More...
