Audio modulators

Manufacturer: Sony Model: WRT 810A Synthesized Wireless Microphone Description: The WRT-810A is a tr (more)ansmitter for an 800 MHz band UHF synthesized wiresless microphone system  to be used forbroadcast or movie production purposes. The microphone/transmitter is  classified by frequenzy band. Features: - easy selection of 94 channels- operation powered by widely available batteries- CPU and LCD for coordinated operation control- saved channel and input attenuation settings- highly reliable electronic attenuator- handy audio input switch- compatibility with Sony lavalier micrrophones (WRT-820A)- RF carrier with tone signal- wide dynamic range low noise Specifications: Transmitter and Modulator Section - Oscillator  Crystal controlled PLL synthisizer- Carrier frequencies 94 settings at 125-<Hz intervals   WRT-810A (64): 770.125 to 781.875 MHz   WRT-810A (66): 782.125 to 793.875 MHz   WRT-810A (68): 794.125 to 805.875 MHz- Tone signal  32.768 MHz- Type of emission 110KF3E- RF power output 10 mW/2.5 mW, selectable (50 ohms) Power section - Power requierments 3 V (two L40 (LR6) akaline batteries)- Battery life  About 8 hours at 25°C (with Sony AM3 (LR6) akaline batteries)- Current consumption Less than 170 mA (3 V) General - Opering temperature 0°C to 50°C- Storage temperature -30°C to plus 60°C- Dimensions  48 x 238 mm- Weight   about 300 g (including batteries) Items delivered: - Sony WRT-810A Wireless Microphone (without batteries)- Carrying Case The microphone is in used cosmetic condition and fully functional tested.