VHF3000 VERSIONS.
Ver. 20.0 is for 10 Mhz Synthesizer and enhanced back-up of sq-vol and back light.
Ver. 21.0 is for the new temporary 10 Mhz Synthesizer on PCB 550 ver. F and is not reversely compatible.
ver. 22.0 is for the new PCB 550 version I with new 3 step Squelch and new Synthesizer. The new PCB 550 is implemented in the production from January the 1th. 1996. The software is not reversely compatible to any other versions of PCB 550.
Ver. 62.0 is for the 6.25Mhz Synthesizer.