AM/FM Stereo Headset (120-0105) Specifications Faxback Doc. # 7084 With Digital Tuning GENERAL Stereo Headphone Impedance.........................................32 ohms Output reading is taken across a non-reactive load. Reference Output......................................................1 mW The generator output shall be terminated with an IRE test loop by pointing the test loop toward the rear of the right headphone. AM BAND Power supply voltage.................................................3 VDC Modulation.....................................................400 Hz, 30% Unit Nominal Limit Frequency Coverage..............................kHz..530--1710...530--1710 Intermediate frequency..........................kHz........450.........--- Max. sensitivity for reference...600 kHz...microV/m........350........1300 output..........................1000 kHz...microV/m........180........1300 ................................1450 kHz...microV/m........120........1300 Usable sensitivity for 20 db S/N........................600 kHz...microV/m.......1200........2200 ................................1000 kHz...microV/m........790........2000 ................................1450 kHz...microV/m........670........2000 S/N at 5mV/m....................1000 kHz...dB...............35..........28 ACA at reference output....................dB...............23..........16 AGC figure of merit.............1000 kHz...dB...............55..........48 IF rejection.....................600 kHz...dB...............55..........70 Image interference rejection....1450 kHz...dB...............43..........35 Bandwidth at 6 dB down.....................kHz........................4--9 Output at 10% THD, 5 mV/m 80% modulation..................1000 kHz...mW.............18.5..........10 THD at reference output, 5mV/m, 30% modulation..................1000 kHz...%...............2.5...........5 DC current drain, no signal................mA...............21..........25 Whistle modulation of 2nd/3rd harmonic, 1--100mV/m.......................%.................7..........15 Audio fidelity at 6 db down, 1 kHz=0 dB.................................Hz........100--2500...150--1800 Step frequency.............................kHz..............10.........--- Scan stop sensitivity.......... 1440 kHz...microV/m........500........1000 FM BAND Antenna input impedance............................................75 ohms Disconnect the wire antenna and headband antenna when measuring electrical performances. Modulation........................................400 Hz, 75 kHz deviation Power supply voltage.................................................3 VDC Unit Nominal Limit Frequency coverage...........................MHz..87.5--108.1..87.5--108.1 Intermediate frequency.......................MHz 10.7..........--- 3% THD sensitivity..............90.1 Mhz..microV.........10.............20 ................................98.1 MHz..microV.........10.............20 ...............................106.1 Mhz..microV.........10.............20 S/N at 1 mV.....................98.1 MHz..microV.........57.............50 --3 dB limiting.................98.1 MHz..microV..........3.5..........6.3 IF rejection....................90.1 MHz......dB.........60.............50 Image interference rejection...106.1 MHz......dB.........24.............20 Spurious response...............98.1 MHz......dB.........60.............50 ACA at 100 microV, +/- 400 kHz..98.1 MHz......dB.........25.............15 Capture ratio...................98.1 MHz......dB..........3.5............6 De-emphasis, 1 mV input...........100 Hz......dB..........0........0--+/-3 .................................8000 Hz......dB........-12......-12--+/-4 Output power at 10% THD.........98.1 MHz......mW.........18.............10 Audio THD at 400 Hz, 1mV input..98.1 MHz.......%..........0.5............2 Lowest battery voltage for operation...................98.1 MHz.......V..........2............2.3 Overload THD 100 mV input.......98.1 MHz.......%..........1..............3 Step frequency...............................kHz........200 Scan stop sensitivity...........98.1 MHz..microV..........8.............16 Current drain at no signal....................mA.........35.............46 FM STEREO Standard modulation: Main carrier (L+R)..........................33.75 kHz (45%) deviation Subcarrier (L-R)............................33.75 kHz (45%) deviation Pilot (19kHz).................................7.5 kHz (10%) deviation Modulation frequency............................................1 kHz Unit Nominal Limit Stereo separation at 1mV input....100 Hz.....dB...........24............20 1 kHz.....dB...........28............22 10 kHz.....dB...........24............20 THD at 1 mV input..................1 kHz.....%.............0.5.......... 3 Stereo beacon sensitivity................microV............3.5.........--- 38 kHz leakage, 1 mV input...................dB...........28............20 Pilot modulation, 1 mV input.................%.............4.............7 Output Power:................................................15 mW + 15 mW Power Requirements:......................................Two AAA Batteries Alkaline Battery Life:......................................About 28 Hours Weight with Batteries:.....................................4.95 oz (140 g) Specifications are typical; individual units might vary. Specifications are subject to change without notice. (SMC/ir-05/12/95)