The JRC JMA-9100 series splits into the flagship JMA-9110 chart radar, the workhorse X-band JMA-9122 (best reconditioned-stock depth) and the higher-performance JMA-9132 / 9132S. Processor, display and NKE-1130 scanner are commonly cross-compatible; magnetrons and IF amplifiers are not.
No — JRC has migrated new-build sales to the JMR-9200 series. The route to a working JMA-9100 bridge is either reconditioned or a like-for-like JMR-9200 upgrade.
The JMA-9122 (X-band 25 kW). It is the most-installed variant on the JRC bridge and has the widest reconditioned-stock availability.