RCH3000
From W3AXL Wiki
The Motorola RCH3000 is an SB9600 Desk Console for remote control of Astro, MCS2000, and iDEN radios.
I've scanned and uploaded the RCH3000 manual as I recently found one and I've not seen it posted anywhere else.
68-81129E92-C RCH3000 Installation & Operation Manual with Schematics
More information to come as I write some more!