Manufactured by Sony, Tokyo.
The 7600 model series of Sony receivers was initially continued in 1987 with the ICF-7600DS or ICF 2003; at the beginning of the 1990s, Sony gave the ICF-SW7600 a new appearance with trendy round, partly recessed buttons and dark colour. A technological advance was the ICF-SW7600G, introduced in 1994, with a very similar appearance, smaller tuning steps, twice as much memory channels and, above all, the synchronous detector for automated ECSS reception, which was integrated for the first time in a portable travel receiver. In 2001, a version with a modernised look and a bright aluminium colour was released, the ICF-SW7600GR.
- Principle: Double conversion superhet, IF 55.845 MHz, 455 kHz / FM 10.7 MHz
- Operation modes: A1 with BFO, AM (A3), FM (F3)
- Frequency range: FM, LW, MW, SW (1.6 - 29.999 MHz)
- Frequency display: Digital display 1 kHz, fine tuning with knurled wheel
- Frequency memories: 100
- Signal processing: Synchronous detector, attenuator DX / Local
- Features: Clock, timer function, FM stereo via headphones
- Sensitivity: AM (A3) / Selectivity: kHz (-6/-60 dB)
- Mains operation: 110, 220 V with mains adapter
- 184 x 118 x 32 mm, weight 0.615 kg
The dimensions of the silver-coloured 18.5 x 11.8 x 3.0 cm cabinet of the ICF-SW7600GR have not been changed compared to previous models. The weight of 615 g of the set, which is equipped with four UM-3 batteries, makes it easy to be taken on holiday trips.
The loudspeaker is located behind the left front panel. The 400 mW output is sufficient to supply a room; when used with headphones, the 7600GR also provides stereo reception on FM. The main switch at the top right of the front panel is designed as an ON/OFF pushbutton; right next to it is the sleep button and a HOLD switch that prevents the receiver from being accidentally switched on while in luggage.
The numeric keypad with the key „5“ marked for the visually impaired can be used to enter a reception frequency directly; the AM/FM key first preselects the corresponding operation mode AM or FM. The key sequence DIRECT - 6 - 1 - 5 - 5 - EXE calls up the frequency of Radio Oesterreich International from Vienna. The frequency stored by pressing ENTER and a number key can be called up later simply by pressing the corresponding number key. From a recalled frequency, the receiver can also be tuned manually; two up and two down keys, arranged in a half-moon shape, increase and decrease the reception frequency in steps of 1 and 5 kHz, respectively. Unfortunately, a rotary knob for tuning was (consequently) omitted. Pressing the AM band button together with the Up / Down buttons allows the receiver to jump from one broadcast band to the next. The Standby Memory A / B buttons are assign the stations to be activated in timer mode.
The LCD display, which can be illuminated by pressing the Light button on the left of the loudspeaker grille, shows either the operation frequency with an accuracy of 1 kHz or the time. Furthermore, the number of the activated station memory, the activation of timer-sleep mode, the keypad lock and the imminent battery exhaustion are also signalled.
The volume control, the tone control, the mode switch for normal AM reception, AM with synchronous detector and SSB reception, the switch for selecting the sideband and the knurled knob for +/- 1.5 kHz fine tuning in ECSS and SSB mode are arranged one above the other on the right face of the unit. The antenna socket, the input attenuator and the jacks for headphones and cassette recorder as well as the power supply socket for the mains adapter are located on the left face of the ICF-SW7600GR.
The set's reception performance is above average for a travel receiver; thanks to the tuning steps, which are reduced to 1 kHz, it is possible to avoid interfering adjacent channel stations in AM reception. In case of stronger interferenc and fading, the synchronous detector performs best. For automatic ECSS reception, it locks onto the carrier of a station even at low signal strength. Afterwards, in case of disturbed reception, the sideband selector switch can be used to selectively demodulate the less affected upper or lower sideband, which improves intelligibility a great deal. The synchronous detector seems more effective than in various tabletop receivers, but for me it does not quite reach the quality of the circuit in Sony's ICF-2001D.
Thanks to the reduced tuning steps, the additional memory channels, the illuminated display and, above all, the synchronous detector, the ICF-SW7600GR has earned a top ranking among travel receivers. It was the only serious double conversion travel portable still sold by Sony in the 21st century.
Double conversion, digital frequency processing using a PLL synthesizer, synchronous detector.
The set is equipped with semiconductors.