Sony ICF-SW77 Clock Radio, size: 671 KB
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|jonah.n||6:33am on Wednesday, August 4th, 2010|
|One of the great ones Shame to see this greatest of the great shortwave portable receivers discontinued from the Sony line like the venerable and magn...|
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Modification of Sony ICF-SW77 for DRM Software receiver
Page 1 of 8
Table of Contents
1 INTRODUCTION..... 3 1.1 1.3 PURPOSE OF THIS DOCUMENT.... 3 ORGANIZATION OF THIS DOCUMENT.... 3
SYSTEM OVERVIEW.... 3 CHANGE OF 455 KHZ IF FILTER.... 3 3.1 3.2 3.3 SCHEMATIC..... 3 FILTER BANDWIDTH.... 5 IF FILTER TYPES.... 6
CONNECTION OF DRM MINIATURE MIXER UNIT... 6 4.1 4.2 POWER SUPPLY..... 7 IF CONNECTION..... 7
Page 2 of 8
1.1 Purpose of this document This document describes how to modify a Sony ICF-SW77 short wave receiver to be able to receive a DRM signal. Therefore the DRM Miniature Mixer Unit from Sat-Service Schneider is used, to mix down the 455 kHz IF of the receiver to a 12 kHz IF. This 12 kHz IF is feed to a PC sound card. Please note that the manufacturer's warranty will be discarded if you do this modification. 1.2 Organization of this document Chapter 1 provides an introduction to the document. Chapter 2 provides an overview of the system. Chapter 3 describes how the IF filter of the ICF-SW77 has to be changed. Chapter 4 describes how the DRM Miniature Mixer Unit has to be connected to the receiver.
2 System overview
The 2. IF (455 kHz) of the ICF-SW77 receiver is feed to the miniature mixer unit and down converted to a 12 kHz IF. This IF signal is then connected to the input of a PC sound card. This PC decodes the DRM signal with a decoder software.
455 kHz mixer
3 Change of 455 kHz IF filter
The bandwidth of the ICF-SW77 receiver is too small to receive a DRM signal. Therefore the IF filter has to be changed. 3.1 Schematic The following diagram shows the schematic of the SW 77 IF section.
Page 3 of 8
wide band filter
narrow band filter
The IF section has two IF filters, a narrow band filter and a wide band filter. One of these filters has to be replaced by a wider filter with appr. 10 kHz bandwidth. The filter W is active if the receiver is in wide mode, the filter N is active if the receiver is in narrow mode.
Page 4 of 8
3.2 Filter bandwidth The with the receiver supplied wide band IF filter has a bandwidth ob appr. +/- 3 kHz. The bandwidth is shown in following diagram:
The recommended replacement filter is a Murata CFWM455GY, which has the same footprint as the original filter, but a bandwidth of appr. +/- 4,5 kHz. The bandwidth is shown in following diagram:
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3.3 IF Filter types The following Murata filter types are fitting into the IF filter footprint in the SW77 receiver: Part Number CFWM455G CFWM455F CFWM455E 6 dB bandwidth +/- 4.5 kHz +/- 6.0 kHz +/- 7.5 kHz
4 Connection of DRM Miniature Mixer Unit
The IF frequency is 455 kHz in the SW77 receiver. Therefore the mixer unit with a 467,0 kHz oscillator is needed. It is recommended to use the mixer unit with the crystal oscillator.
Page 6 of 8
4.1 Power supply The mixer unit needs a power supply with 7-20 V DC. Unfortunately the receiver supplies a maximum voltage of 6 V. Test showed that it is possible to use the 6V instead of the 7-20 V to run the mixer unit. An other possibility is to remove the voltage regulator on the mixer unit and replace it with a diode (e.g. 1N4007). The 6V power lines of the mixer unit can be connected to the connector at the right side of the PCB (back view). The +6V line is the most top solder point. The ground can be connected to the last solder point of the connector. It is recommended to use the external power supply and not the batteries when the receiver is used as a DRM front end.
4.2 IF connection The hot line of the IF input should be connected to pin 14 of IC301. The ground connection of the IF input should be connected to pin 12 of IC301.
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FM Stereo Multi-Band World Band Receiver
v v v v v v AM (LW/MW/SW)/FM STEREO WORLDWIDE RECEPTION PLL QUARTZ FREQUENCY SYNTHESIZED TUNING 10 KEY DIRECT ACCESS TUNING MANUAL AND AUTOMATIC SCAN TUNING 162 STATION MEMORY PRESET TUNING FACTORY-PROGRAMMED COUNTRY AND FREQUENCY PRESETS SSB (SINGLE SIDE BAND) CIRCUITRY SYNCHRONOUS DETECTION CIRCUITRY BUILT-IN CLOCK WITH ALARM, SLEEP FUNCTION, AND TIMER/STANDBY KEY PROTECTION CIRCUITRY TAPE RECORD-OUT JACK BACKLIT LCD DISPLAY WITH CONTRAST ADJUSTMENT UNIVERSAL TIME COORDINATOR (UTC) WITH WORLD TIME SCALE STEP-UP FEATURE NEW FEATURE
AM(LW/MW/SW)/FM STEREO WORLD WIDE RECEPTION provides
v JACKS include stereo earphone and tape recording outputs
LARGE 4" SPEAKER provides wide range sound with separate bass and
accurate reception with stereo FM capability over a wide range of frequencies from LW and MW(AM) to SW and FM; Band Pass Filter automatically switches to the Short Wave band in accordance with the frequency being received and effectively reduces interference from bands outside of the one being listened to
PLL QUARTZ FREQUENCY SYNTHESIZED TUNING is an extremely
treble controls for optimum reception of voice or music broadcasts
TILT STAND is built-in for convenient use on a table or desktop BUILT-IN ANTENNAS include ferrite bar antenna for AM and LW,
telescoping antenna for FM and SW
EXTERNAL ANTENNA INPUT is provided to connect the supplied Short
accurate method of tuning, with optimum stability that reduces drift to a minimum
SSB (SINGLE SIDE BAND) CIRCUITRY for optimum multi-mode reception
Wave compact antenna for improved reception
STEREO HEADPHONES are supplied for the best sound from FM stereo
broadcasts and for private listening
and reduced interference on narrow AM bands for better overall sound
v SYNCHRONOUS DETECTION CIRCUITRY reduces fading and annoying
SIGNAL CIRCUITRY: FM: Superheterodyne
"beat" frequency interference from adjacent stations as well as distortion due to fading in AM reception
10-KEY DIRECT ACCESS TUNING lets you key in distant stations directly
AM: Dual Conversion Superheterodyne
FREQUENCY RANGE: FM: 76.5-108 MHz
ANTENNA SYSTEM: LW/AM: Built-in Ferrite Bar Antenna
by their frequency number, with the ease of using a pocket calculator
v MANUAL TUNING via the smooth, rotary dial provides for precise station
SW/FM: Telescoping Antenna
INPUTS: External Antenna OUTPUTS: Stereo Headphone (Stereo Mini jack)
reception and allows you to change the tuning interval from Fast (1kHz) to Slow (5kHz)
v AUTO SCAN TUNING brings in available stations one at a time, and lets
Recording Output (mini jack)
SPEAKER: 4" (10cm) POWER REQUIREMENTS: 6V DC
you listen for a few seconds before deciding to let scanning continue or hold on any station
162 STATION MEMORY PRESET TUNING lets you quickly and easily tune
in stations that have been saved in memory, by selecting on of the five Station Names on each Preset Page
TUNING PAGES (up to 20) each contain five Station Names designated by
up to six characters (i.e. BBC) for 100 Station Names in total. Each Station Name can hold up to 10 frequencies in memory to a maximum of 162 memorized frequencies
QUICK PAGES for fast preset tuning of your most frequently listened-to
"C" Batteries x 4 (optional) 120V, 60Hz with AC Adaptor, supplied BATTERY LIFE (APPROX.): FM Reception: 45 hours AM Reception: 32 hours DIMENSIONS (WHD): 10 78" x 6 1316" x 1 1316" (276 x 172.5 x 46.5mm) WEIGHT: 3 lbs 4 oz (1.48kg) with batteries SUPPLIED ACCESSORIES: AC Power Adaptor, Stereo Headphones, Carrying Belt, Compact Shortwave Antenna, External Antenna Connector, "Wave Handbook", "How to Catch the Wave" Guide OPTIONAL ACCESSORIES: AN-1/AN-102 LW/MW/SW Wide Range Antenna
2002 Sony Electronics Inc. Reproduction in whole or in part without written permission is prohibited. All rights reserved. Sony, Direct Access, and World Band Receiver are trademarks of Sony. Features and specifications are subject to change without notice. Non-metric weights and measures are approximate.
stations, hold two pages with five Station Names or five frequencies, for a total of 10 stations
TIMER PAGE stores up to five stations or frequencies for timer operation,
such as turning the radio on or off at a specified time, for unattended recording off the air, or to wake up to the radio
BACKLIT LCD DISPLAY WITH CONTRAST ADJUSTMENT for highly visible
read-out of frequency, Station Name, signal meter, clock, and all other radio operating functions
v BUILT-IN CLOCK WITH SLEEP TIMER automatically turns the radio off
after 15, 30, or 60 minutes and can act as an alarm that wakes you to a pre-selected station
UNIVERSAL TIME COORDINATOR (UTC) for setting the current local
time and the time-difference between your location and any other in the world
WORLD TIME SCALE provides a fast, visual map reference of current time
anywhere around the globe
v KEY PROTECTION CIRCUITRY protects against accidental changes to
preset station settings
Sony Electronics Inc 1 Sony Drive, Park Ridge, New Jersey 07656 www.sony.com
Printed in USA 2/2002
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