APX7500
I have my Astro Saber set up to not affiliate, and RX only, with the CSP system and have no issues. Works just fine. I also checked on the legality of setting up the Astro Saber in the manner I did and it violates no laws.
If you're going to throw out that it is illegal, please show me the letter of the law, if not , I'm going with the counsel of a DHS attorney I have worked with on projects, who deals with interoperability implementation issues.