Description
The input section features the unique servo bias input circuitry with a standard TA5M type jack for use with electret lavaliere mics, dynamic mics, or line level signals. A DSP-controlled analog audio limiter is employed before the A-D converter. The limiter has a range of more than 30 dB for excellent overload protection and a dual release envelope that makes the limiter acoustically transparent while maintaining low distortion. The limiter recovers quickly from brief transients, with no audible side effects, and also recovers slowly from sustained high levels to keep audio distortion low while preserving short term dynamics.
Digital Hybrid Wireless™ is a revolutionary new design that combines 24-bit digital audio with an analog FM radio link to provide outstanding audio quality and the extended operating range of the best analog wireless systems. The design overcomes channel noise in a dramatically new way, digitally encoding the audio bitstream in the transmitter and decoding it in the receiver, yet sending the encoded information via an analog FM wireless link. This proprietary DSP algorithm eliminates a compandor circuit and its artifacts, and preserves the RF spectral footprint of analog FM designs to simplify multi-channel coordination with exisiting analog wireless systems.
Tech Specs
Frequency range: 256 frequencies in 100 kHz steps for one25.5 MHz wide block
Channel Spacing: 100 kHz
Frequency selection: Control panel mounted membrane switches
RF Power output: 50 mW (nominal)
Compatibility Modes (6): Digital Hybrid Wireless® (400 Series) and IFB
Pilot tone: 25 to 32 kHz; 3 kHz deviation in hybrid mode
Frequency stability: ± 0.002%
Deviation: ± 50 kHz max. in hybrid mode
Spurious radiation: 60 dB below carrier
Equivalent input noise: –125 dBV, A-weighted
Input level:
If set for dynamic mic: 0.5 mV to 50 mV before limiting.Greater than 1 V with limiting.
If set for electret lavaliere mic: 1.7 uA to 170 uA before limiting. Greater than 5000 uA (5 mA) with limiting.
Line level input: 17 mV to 1.7 V before limiting. Greater than 50 V with limiting.
Input impedance:
Dynamic mic: 300 Ohms
Electret lavaliere: Input is virtual ground with servo adjustedconstant current bias
Line level: 2.7 k Ohms
Input limiter: Soft limiter, 30 dB range
Bias voltages: Fixed 5 V at up to 5 mASelectable 2 V or 4 V servo bias for any electret lavaliere.
Gain control range: 40 dB; panel mounted membrane switches
Modulation indicators: Dual bicolor LEDs indicate modulation of –20, -10, 0, +10 dB referenced to full modulation.
Controls: Control panel with LCD and four membrane switches.
Signal to Noise Ratio (dB):
(overall system, 400 Series mode)
| SmartNR |
No Limiting |
w/Limiting |
| OFF |
103.5 |
108.0 |
| NORMAL |
107.0 |
111.5 |
| FULL |
108.5 |
113.0 |
(Note: the dual envelope “soft” limiter provides exceptionally good handling of transients using variable attack and release time constants. The gradual onset of limiting in the design begins below full modulation, which reduces the measured figure for SNR without limiting by 4.5 dB)
Total Harmonic Distortion: 0.2% typical (400 Series mode)
Audio Input Jack: Switchcraft 5-pin locking (TA5F)
Antenna: Flexible, unbreakable steel cable.
Batteries: 1.5 Volt AA lithium or rechargeable NiMH recommended
Battery Life:
SMB: 2 hours (alkaline); 7.25 hours (lithium), 5 hours with 2500mAh NiMH
SMDB: 6 hours (alkaline); 14.5 hours (lithium), 8.5 hours with 2500mAh NiMH
Weight:
RM: 2.3 oz.. (65.8 grams) with lithium battery
SMB: 2.7 oz.. (75.9 grams) with lithium battery
SMDB: 3.7 oz.. (105 grams) with lithium batteries
Overall Dimensions:
SMB/RM: 2.3 x 1.8 x 0.64 inches (not including microphone/lanyard) 58 x 46 x 16 mm (not including microphone/lanyard)
SMDB: 2.3 x 2.4 x 0.64 inches (not including microphone) 58 x 60 x 16 mm (not including microphone)
Emission Designator: 180KF3E
Specifications subject to change without notice.
