BTX-121 (190-1202) Specifications Faxback Doc. # 8796 MEASUREMENT CONDITIONS Power Source......................................................8.4V DC Antenna Impedance..................................................50 ohm Microphone.......................................................Electric Speaker........................................................8 ohm/0.5W Two Switchable Channel.............................................A or B Installed CH-A Frequency.......................................154.600MHz Frequency Range.................................................+/-2.5MHz Channel Space.......................................................30kHz Audio Output Load...................................................8 ohm Temperature..................................................77 degrees F Crystal Oscillation........................................TX Fundamental Receiver Unit Nominal Limit Sensitivity 12 dB SINAD microV 0.25 0.5 Sensitivity 20 dB NQS microV 1 2 Squelch Sensitivity Threshold microV 0.25 0.5 Squelch Sensitivity Tight microV 1 2 Squelch Hysteresis Threshold dB 3 2 Squelch Control Range dB 10 8 Spurious Response 2F-1st IF dB 70 60 ACA Selectivity +/-30kHz dB 60 54 Image Rejection 1st/2nd IF dB 50 48 S/N Ratio 1 mV Input dB 30 30 THD 1 mV 1 kHz % 5 5 Maximum Power 1mV Input mW 300 250 10% THD Power 1mV Input mW 200 200 Frequency Response 300/1k/2k/3kHz EIA STANDARD Minimum Operation Voltage V 6.5 7.0 Current Drain No Signal mA 40 50 Current Drain Maximum Power mA 80 100 TRANSMITTER SPECIFICATION LIMITS Transmission Frequency MHz +/-0.0025 RF Power Output (HI/LOW) W 1/0.6 +/-0.2 Input Level 3kHz Deviation mV 10 10 Modulation Distortion 1k/3kHz Deviation % 5/9% Modulation Frequency Response EIA STANDARD AMC Range from 3kHz Maximum Deviation dB 20 15 Current Drain No Modulation mA 400 500 Minimum Operation Voltage V 6.5 7.0 2nd/3rd/4th/5th dB 45 43 6th/7th/8th dB 45 43 Ft+Ft/Ft+2Ft/Ft+3Ft dB 45 43 Ft-Ft/Ft-2Ft/Ft-3Ft dB 45 43 Note: Nominal specs represent the design specs. All units should be able to approximate these - some will exceed and some might drop slightly below these specs. Limit specs represent the absolute worst condition that still might be considered acceptable; in no case should a unit fail to meet limit specs. TRANSMITTER: Frequency Coverage....................................151.250 to 156.255MHz Frequency Tolerance.............................................+/- 2.5 kHz Type of Modulation.......................................................FM RF Power.....................................................HI 1W, LO 0.5W Deviation..........................................................+/- 5kHz Spurious Rejection....................................................48 dB Minimum Operating Voltage..............................................7.5V REVEIVER: Sensitivity (Sinad 12 dB).......................................... 0.5 uV Signal-to-Noise Ratio (20 dB).......................................0.75 uV AF Power Output.......................................................350mW Current Drain.........................................................150mA Adjacent Channel Rejection.............................................50dB Squelch Sensitivity (Start)..........................................0.4 uV Stop Voltage.............................................................5V Distortion (1 mV Input 4.3 kHz)..........................................6% GENERAL: Power Supply...................................................8.4 Volts DC Antenna Length........................................................150mm Dimensions...................................2-1/2 x 1-1/2 x 6 inches (HWD) (65 X 35 x 160 mm) Weight......................................................14.11 oz (400g) (BR/smc-4/26/94)