Specifications and features – Lectrosonics UM250b User Manual
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SPECIFICATIONS AND FEATURES
Operating frequencies:
470 to 608 MHz, 614 to 806 MHz
Frequency selection:
256 frequencies in 100kHz steps
RF Power output:
250 mW
Pilot tone:
32.764 kHz (± 2Hz); 5kHz deviation
Frequency stability:
± 0.002%
Deviation:
± 75 kHz (max)
Spurious radiation:
90 dB below carrier at frequencies less than 1GHz
Equivalent input noise:
-126 dBV
Input level:
Nominal 2 mV to 300 mV, before limiting.
Mic input greater than 2V, with limiting.
Line input greater than 20V, with limiting (Input to pin 5,
pin 4 tied to ground.)
Input impedance:
Taps provided for dynamic, electret and line level.
Mic load impedance greater than 4k.
Line load impedance greater than 10k.
Input compressor:
Soft compressor, >30 dB range
Gain control range:
43 dB; semi-log rotary control
Modulation indicators:
Dual LEDs indicate modulation level 12 dB below limiting
and at the onset of limiting.
Controls:
2 position “OFF-ON” slide switch for noiseless turn on/turn
off operation. Front panel knob adjusts audio gain. Re
cessed control on side panel adjusts low frequency rolloff.
Rotary switches on side panel adjust transmitter frequency.
Audio Input Jack:
Switchcraft 5 pin locking (TA5F)
Antenna:
Detachable, flexible bronze cable supplied. 50 Ohm port
allows connection to test equipment.
Battery:
Precision compartment auto-adjusts to accept any known
alkaline or lithium 9 Volt battery. (We’ve tried 150
different ones!)
Battery Life:
2 Hours with alkaline 9 Volt, 7 hours with lithium
Weight:
6.6 ozs. including battery
Dimensions:
3.1 x 2.4 x .75 inches
Emission Designator:
160KF3E
Specifications subject to change without notice.
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