Vertex_VX-1700_series_Transcrypt_SC20-455_user.pdf

APPLICATION NOTE 751F005A Page 1 of 3 SC20-455 Make: Vertex Standard Date: 09/15/06 Model: VX-1700 Prepared By: DG / SSL Description: HF, SSB, Mobile Notes: Additional Installation Parts: SCRAMBLER INFORMATION The scrambler provided has been programmed and modified specifically for this radio and should not be used for another type of radio without proper modifications. Specific modifications to the scrambler are listed below. SCRAMBLER MODIFICATION PARTS 2 ea. 30 k, 2 ea. 39 k resistors, SMT 1206 size. SCRAMBLER HARDWARE MODIFICATIONS TX Modifications RX Modifications R2: 39 k R4: 30 k C32: 1 F R1: 39 k R3: 30 k C35: 0.1 F Miscellaneous Modifications SCRAMBLER SOFTWARE MODIFICATIONS IMPORTANT NOTICE Before and after installation of a scrambler into any radio, the operation of the radio should be checked to verify it is operating normally. Refer to the appropriate radio service manual(s) for more details. This installation should only be attempted by a qualified two-way technician with proper tools and radio documentation. Due to static sensitivity, installation should be performed at an ESD work station. Place scrambler as far away from RF power components as possible. Keep all wires as short as possible. Insulate the scrambler, if needed; secure it in the radio. Questions should be directed to Transcrypt International at (800) 228-0226 or (402) 474-4800. Scrambler Type: SC20-455 App. Note #: 183-00500308-01 Default Clear / Code Switch P4 Button Default Clear / Code Indicator Red LED Scrambler Modifications Completed By: _ Date: _/_/_ APPLICATION NOTE 751F005A Page 2 of 3 SC20-455 RADIO INFORMATION RADIO MODIFICATION PARTS NEEDED 1 ea. Red LED. 1 ea. 470 resistor, SMT 1206 size. RADIO MODIFICATIONS TX Cut Location: Program Radio: Each Channel: Program Encryption Encr for v. RX Cut Location: Modification done on TX Cut Location also opens RX audio path. ADDITIONAL RADIO HARDWARE MODIFICATIONS Install a white wire jumper between the collector of Q1084 and J1004 PIN 3. Mount red LED on Front Panel Assembly. Install a jumper between the red LED, cathode side, and TP3016. Install a 470 resistor between the red LED, anode side, and TP3028. ADDITIONAL RADIO SOFTWARE MODIFICATIONS On Common - Key Function, program a key for AUX TOGGLE. On Common - Option, program Encryption Unit for ON. On Common - System, program MICGain for NORMAL. (Vertex Standard default setting.) Code Select (Optional): Each Channel: Program Encryption Code for a number. Encryption Code 1 selects individual code 0, Encryption Code 2 selects individual code 1. Encryption Code 15 selects individual code 14, Encryption Code 16 selects individual code 15. Program Encryption Code for 16 for default applications. Measured Audio Levels: TX:500 mV P-P RX:650 mV P-P APPLICATION NOTE 751F005A Page 3 of 3 SC20-455 SCRAMBLER INSTALLATION POINTS GENERAL GENERAL INSTRUCTIONS RX audio at TP1003 measured to be 875 mV P-P, at full volume. Default Location of Red LED: On Front Panel Assembly, between CH and speaker. DIAGRAMS / PICTURES (if applicable) APPLICATION NOTE REVISION HISTORY Date Rev # By ACO / REF # Description PIN # Function Wire Color Descriptions J1 PIN 1 TX In Orange Solder to TP1061. J1 PIN 2 RX In Green Solder to TP1060. J1 PIN 3 On / Off Indicator J1 PIN 4 Binary Code Select 8 White / Brown Code Select (Optional): Solder to TP1058. J1 PIN 5 Binary Code Select 4 Pink Code Select (Optional): Solder to TP1057. J1 PIN 6 Binary Code Select 2 Tan Code Select (Optional): Solder to TP1056. J1 PIN 7 Binary Code Select 1 White / Blue Code Select (Optional): Solder to TP1055. J1 PIN 8 RX Out Blue Solder to TP1054. J1 PIN 9 Clear / Code Violet Solder to D1061, cathode side. J1PIN 10 PTT Gray Solder to TP1052. J1 PIN 11 Power Red Solder to TP1051 (Sw. +8 V). J1 PIN 12 Ground Black Solder to TP1050. J1 PIN 13 TX Out Yellow Solder to TP1049.