Hong Jin Crown America HJC-X2 Users Manual
GMRS X1
SERVICE MANUAL
TABLE OF CONTENTS
CONTENT
1. INTRODUCTION ................................................................................................................................................................ 2
2. TECHNICAL SPECIFICATIONS.................................................................................................................................... 3
A.
GENERAL ......................................................................................................................................................................... 3
B.
TRANSMITTER................................................................................................................................................................ 3
C. RECEIVER......................................................................................................................................................................... 3
3. THERORY OF OPERATION ........................................................................................................................................... 3
INTRODUCTION.................................................................................................................................................................. 3
CIRCUIT
PHASE-LOCK LOOP (PLL) CIRCUIT........................................................................................................................... 4
1)
2)
TRANSMITTER................................................................................................................................................................ 4
DESCRIPTIONS................................................................................................................................................... 4
3) RECEIVER......................................................................................................................................................................... 4
OPERATION.......................................................................................................................................................................... 5
4. ALIGNMENT PROCEDURE............................................................................................................................................ 8
M
EASUREMENT CONDITION.................................................................................................................................................... 8
RANSMITTER ADJUSTMENT................................................................................................................................................... 9
T
R
ECEIVER ADJUSTMENT.......................................................................................................................................................... 8
5. OPERATIONAL TEST....................................................................................................................................................... 9
1. INTRODUCTION
GMRS X1 is FM handhold transceiver operating 462MHz. With the output power of 2 W ERP, the radio is
capable of communicating up to 5 miles.
In addition to its small size, GMRS X1 offers many advanced features that could only be found in the most
expensive GMRS.
Like other HJC quality products, GMRS X1 carries a 12 months limited warranty. Please call our technical or
customer service representatives at +Tel 1 562 407 2188 when you need help, or visit us on the Web
www.chatterboxusa.com
.
2. TECHNICAL SPECIFICATIONS
A. GENERAL
1) Frequency Range : 462.5500 ~ 462.7250 MHz
2) Modulation Type : 16KOF3E (FM)
3) Channel capacity : 15 channels
4) Channel spacing : 25KHz
5) Power Supply : DC 4.8V, Ni-Mh Rechargeable Pack
6) Current Drain : Transmitter (2W ) ----- <1100mA (Ni-Mh Rechargeable Pack)
Receiver (0.5W) ---------<300mA
7) Battery Life : 8hrs. talk time;
20 hrs. stand-by time
8) Operating Temperature : -20°C to +60°C
9) Dimensions : 65(H) x 132(W) x 39(D) mm
10) Weigh : 8 oz.(with battery)
B. TRANSMITTER
1) Power Output : 2W
2) Frequency Stability : Better than +/- 5ppm within operating temperature
3) Hum & Noise : -40dBc(with 300Hz to 3KHz audio filter)
4) Spurious & Harmonics : -60dBc
5) Audio Distortion : Less than 5% (1KHz tone 6 0% modulation)
C. RECEIVER
1) Sensitivity (12dB SINAD) : 0.25Uv(-119dBm SINAD)
2) Selectivity : -60dB
3) Inter-modulation : -60dB
4) Spurious and image rejection : -60dB
5) Maximum Audio Output : More than 200mW
6) Audio Distortion : less than 5%
3. THERORY OF OPERATION
INTRODUCTION
GMRS X1 is a micro size15 channel portable FM transceiver constructed with a microprocessor controlled,
temperature compensated Phase Locked Loop (PLL) frequency synthesizer. The radio features a double
conversion receiver and a direct FM transmitter modulator. A special integrated circuit provides support to
sub-audible signaling (CTCSS) and most of the receiving parts are switched off periodically in the power saver
mode to reduce battery current drain during standby.
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