ZETRON. Model 30 Worldpatch with Selcall. Instruction Manual. Part No. 025-9431B. Please check for change information at the begining of this manual. Spec Sheet Model 30 Worldpatch FEATURES INTRODUCTION • Simplex and half-duplex interconnect for base stations, control stations, and repeaters • Compatible Model 30 Worldpatch. • Simplex and half duplex Interconnect. • End to End Telco Lines and PBX extensions. • Remote programmable from DTMF radio or telephone. EPCOM: 9019417-ZETRON - Interconnect Delay Model 30 Worldpatch with Digital Voice and APO.PATRON Model 30 World patch Instruction Manual Part No. 0259140P Please check for change information at the front of this manual. The Zetron Model 30 is a multi-mode, easy to use telephone interconnect. Simplex VOX, simplex sampling, intelligent sampling, and half duplex modes are