Sony WRT-810A Operating Instructions Manual page 16

Transmitter and Modulator Section
Oscillator
Carrier frequencies
Tone signal
Type of emission
RF power output
Frequency stability
Spurious radiation
Type of antenna
Pre-emphasis
Reference deviation
Maximum deviation
Crystal controlled PLL synthesizer
94 settings at 125-kHz intervals
WRT-810A/820A (64): 770.125 to 781.875 MHz
WRT-810A/820A (66): 782.125 to 793.875 MHz
WRT-810A/820A (68): 794.125 to 805.875 MHz
32.768 kHz
110KF3E
WRT-810A: 10 mW/2.5 mW, selectable
(50 ohms)
WRT-820A: 10 mW (50 ohms)
Within 0.005%
Less than 2.5 uW
1/4 wavelength wire
50 us
+5 kHz
+40 kHz
Maximum modulation frequency
Frequency response
Signal-to-noise ratio
Audio distortion
Audio attenuator
16
15 kHz
WRT-810A: 100 Hz to 13 kHz
WRT-820A: 100 Hz to 15 kHz
More than 60 dB (A-weighted, with reference
deviation at WRR-820A/840A)
WRT-810A: Less than 1.5% (with reference
deviation)
WRT-820A: Less than 1.0% (with reference
deviation)
0 to 21 dB, variable in 3-dB steps
Maximum input sound pressure level (for WRT-810A at 21-dB attenuation
151 dB SPL
Maximum input level (for WRT-820A at 21-dB attenuation)
-3 dB (0 dB = 1 Vrms)
Microphone unit (WRT-810A)
Uni-directional dynamic type
Power Section
Power requirements 3 V DC (two L40 (LR6) alkaline batteries)
Battery life About 8 hours at 25°C or 77°F (with Sony AM:
(LR6) alkaline batteries )
Current consumption Less than 170 mA (at 3 V)
Y