GMRS X1 SERVICE MANUAL TABLE OF CONTENTS
CONTENT 1. INTRODUCTION ................................................................................................................................................................ 2 2. TECHNICAL SPECIFICATIONS.................................................................................................................................... 3 A. GENERAL ........................................................................................................................................................
2. TECHNICAL SPECIFICATIONS A. GENERAL 1) Frequency Range 2) Modulation Type 3) Channel capacity 4) Channel spacing 5) Power Supply 6) Current Drain 7) Battery Life 8) Operating Temperature 9) Dimensions 10) Weigh : 462.5500 ~ 462.7250 MHz : 16KOF3E (FM) : 15 channels : 25KHz : DC 4.8V, Ni-Mh Rechargeable Pack : Transmitter (2W ) ----- <1100mA (Ni-Mh Rechargeable Pack) Receiver (0.5W) ---------<300mA : 8hrs. talk time; 20 hrs. stand-by time : -20°C to +60°C : 65(H) x 132(W) x 39(D) mm : 8 oz.
The Block Diagram RF and Control Circuit Diagrams for GMRS X1 shall be used in associate with the following circuit description. CIRCUIT DESCRIPTIONS 1) PHASE-LOCK LOOP (PLL) CIRCUIT * REFERENCE OSCILLATOR The reference oscillator consists of X301 in U301 with a frequency of 12.8MHz. This comparison frequency is selected by decoding the first three bits of the data input from microcomputer.
First local oscillator signal is supplied to Gate 2 of Q102 form the PLL circuit through C126 to convert the RF signals into 21.4MHz first IF signal. * IF CIRCUIT The first IF signals from Q102 are fed to the matched pair crystal filter XCF101, then IF signals are amplified in Q103. And those signals are fed to U401 which is composed of the second local oscillator, second mixer, limiter amplifier, quadrature detector and active filter circuit. The second local oscillator at 20.
(1) LCD LCD description 1 MODE 2 INTERCOM MODE 3 SCAN MODE 4 VOX 5 BATTERY 6 BEEP 7 KEY LOCK 8 CTCSS SUB TONE 9 CHANNEL (2) PTT button hold down to transmit and release to receive. (3) MODE button press to go several mode. (4) UP BUTTON to select the channel and option in mode operation. (5) DOWN BUTTON to select the channel and option in mode operation.
(16) HAND FREE SOCKET to connect the telephone 2. Operation power ON/OFF Turn the transceiver on by rotating switch in a clockwise direction. 1) channel select Choose the desired channel with pressing UP/DOWN BUTTON, and press PTT BUTTON to complete 2) volume level select Choose the desired volume level with VOLUME UP/DOWN BUTTON, and press PTT BUTTON to complete. The radio is mute when the volume level is selected ‘00’ 3) Tone select Press MODE BUTTON one times.
) power save level select Press MODE BUTTON five times. Choose the desired power save level with pressing UP/DOWN BUTTON and press PTT BUTTON to complete POWER SAVE OFF NORMAL POWER SAVE HIGH POWER SAVE 9) INTERCOM Press INTERCOM BUTTON over 2 seconds. 10) monitor Press INTERCOM BUTTON shortly to monitor, and press it shortly again to stop. 11) hand free Connect the telephone to HAND FREE SOCKET. When the telephone signal comes, press the MONITER BUTTON to receive with hand free.
- Frequency counter more than 1000MHz +/-100Hz tolerance, high input impedance and high sensitivity UHF FM Signal generator, 1000MHz with adjustable frequency, FM deviation, and RF output attenuators. 50Ω Output impedance. Oscilloscope, high input impedance. 16Ω 1 Watt resistor as loudspeaker load Audio Signal Generator, 10Hz to 20KHz, 600Ω impedance with attentuators.
