Sony WRT-57G AEP Service Manual

SPECIFICATIONS
Transmitter and modulator sections
Carrier frequency 470 - 502 MHz
(Refer to page 2)
Modulation F3 (Frequency modulation)
RF power output 20 mW at 50 ohm load
Oscillator Crystal-controlled
Frequency stability +25 kHz
Frequency multiplication
24
2x 10°W or less
+2.4 kHz to +75 kHz at 94 dB SPL (at 500 Hz)
0.7% or less (+75 kHz deviation at
40 - 15,000 Hz)
50 usec
Approx. 3/4 wave length flexible wire
Spurious emission
Deviation
Audio distortion
Pre-emphasis
Antenna
Audio section :
Microphone unit Back-electret condenser capsule
Sensitivity adjustable range
30 dB
Frequency response 70 Hz - 15,000 Hz
(Refer to page 2)
Directivity Uni-directional
Signal-to-noise ratio 66 dB or more (+75 kHz deviation at 500 Hz)
New DIN 45 405, PEAK
34 dB SPL or less (converted to the
equivalent input sound, 0dB SPL = 2x
10-4 ubar)
Wind noise * 1 43 dB SPL or less (with the wind screen)
External magnetic field induction noise *?
; 5 dB SPL/milligauss or less
Inherent noise
MICROFILM
Power section
Power requirements 9 V dc with a mercury battery |EC
designation 7MR9 or equivalent
Minimum voltage: 7.0 V dc
Current consumption
35 mA or less
Battery life Approx. 5 hours with Sony Eveready H-7D
General
Dimensions 21 mm dia. x 159 mm,
(/s inch dia. x 63/e inches)
Weight 190 g (6.7 oz) including battery
Finish Satin-nickel plate
Operating temperature
5°C to 50°C (41°F to 122°F)
depending upon the operating
temperature limits of the mercury battery
Design and specifications subject to change without notice.
*1 Wind noise is the value measured by applying a wind velocity of
2 mis (6.6 ft/s) to the microphone from ail directions. The mean
value is taken and converted to the equivalent input sound level.
(0dB SPL = 2x 10° ybar)
*2The external magnetic field induction noise is measured with
the microphone placed in an alternating magnetic field of 50 Hz,
1 milligauss. The maximum noise value is taken and then con-
verted to the equivalent input sound level. (QdB SPL = 2 x
N Y.
SERVICE MANUAL