Astro Spectra Cps 503 Rvn4183 Better -

Uses CPS R05.03.00 (RVN4183) . These are the 512k or 1MB VOCON models.

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She needed to talk to the dead. Not with Ouija boards, but with frequency hops and trunked systems. Her brother, a signal intelligence officer, had gone dark three weeks ago in the Badlands. His last known transmission was a single squawk of static on a restricted band. The only radio capable of hearing that band was this ancient Motorola. Uses CPS R05

These are internally different (using XTL-based boards) and require Astro 25 Mobile CPS (RVN4185) instead. You can identify a "Plus" model by its boot screen ("SPECTRA+") or a specific label near the model number. Hardware Requirements for Reliable Programming Not with Ouija boards, but with frequency hops