Standard Horizon HX270S, Service Manual

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Specifications
General
Frequency range : 156 MHz - 163.275 MHz (Marine Band + WX Band)
Channel Steps : 25 kHz
Frequency stability : ± 5 ppm (–22 °F to +140 °F [–30 °C to +60 °C])
Emission type : 16K0G3E
Antenna impedance : 50 Ohms
Supply voltage : 7.2 VDC
Current consumption : 200 mA (Receive)
40 mA (Standby, Saver Off)
TX: 1.4 A (H)/0.9 A (M)/0.5 A (L)
Operating Temperature : –22 °F to +140 °F (–30 °C to +60 °C)
Waterproof rating : 30 minutes @ 1 meter depth (JIS 7)
Case Size (W x H x D): 2.3” x 4.7” x 1.2” (58 x 120 x 30.5 mm)
Weight (Approx): 13.4 oz (380g) with FNB-83
Transmitter
RF output power
: 5 W/2.5 W/1 W @7.2 V
Modulation Type : Variable Reactance
Max deviation : ±5 kHz
Spurious emissions : At least 73 dB down
Microphone impedance
: 2 k-Ohm
Receiver
Circuit type : Double-conversion superheterodyne
Intermediate Frequencies : 1st: 21.7 MHz
2nd: 450 kHz
Sensitivity
: 0.25 µV 12 dB SINAD
Adjacent channel selectivity : 70 dB
I ntermodulation response : 70 dB
Selectivity : 12 kHz / 25 kHz (–6 dB/–60 dB)
AF output : 600 mW @ 16 Ohm for 10 % THD (@7.2V)