User's Manual

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.