Vertex Standard VX-420

VERTEX STANDARD CO., LTD.

No portion of this manual

may be reproduced without

the permission of

VERTEX STANDARD CO., LTD.

EC050U90A

Contents

Main VX-410/-420 series Service Manual Introduction UHF FM Transceiver Contents Controls & Connectors Before You Begin Battery Pack Installation and Removal Display Icons & Indicators (VX-420 Only) Caution! Low Battery Indication Accessories & Options Monitor Squelch Off Low Power Lock Key Function Follow-Me Scan Dual Watch Talk Around Add/Del Speed Dial ARTS DTMF Paging System (VX-420 only) Cloning Specifications GENERAL Specifications RECEIVER Specifications (Measurements made per EIA standard TIA/EIA-603) TRANSMITTER Specifications (Measurements made per EIA standard TIA/EIA-603) Exploded View & Miscellaneous Parts Page Page Page Circuit Description Receive Signal Path Squelch Control Transmit Signal Path Circuit Description Automatic Transmit Power Control Transmit Inhibit Spurious Suppression PLL Frequency Synthesizer Introduction Required Test Equipment Alignment Preparation & Precautions The alignment tool outline PLL VCV (Varactor Control Voltage) Reference Frequency Transmitter Output Power MAX Deviation CTCSS Deviation MAX Ref Deviation STD Deviation DTMF Deviation DCS Deviation Circuit Diagram RX : XX TX : (XX) TX HIGH : <XX> TX LOW : {XX} LED on : [XX] Page Parts Layout Side B db c 2 3 Parts Layout Page Page Page Page Page Page Page Page Page Page Page DUMMY Unit Page FVP-25 Encryption / DTMF Pager Unit Page VTP-50 VX-Trunk Unit Page DVS-5 Voice Storage Unit