REFUM TRANSMITTER
The low frequency roll-off
is adjustable from 35
Hz to 150 Hz to control
the presence of low
frequency audio in the
program material.
The machined
aluminum battery
door is hinged to the
housing. Battery
contacts automatically
adjust to a wide variety
of alkaline and lithium
9 V batteries.
and spring loaded belt clip
REFSWITCH
Reversible Belt Clip
Easy to reach
ON/OFF switch
handle
Transmitter and
Microphone
Rugged machined aluminum housing
Jacks
Specifications
Operating Frequencies (MHz); Block 21 537.600 - 563.100
SNR at receiver output:
Block 25 640.000 - 665.500
(Note: The dual envelope “soft”
Frequency selection: 256 frequencies in 100kHz steps
limiter provides exceptionally
good handling of transients using
Channel Separation: 100 kHz
variable attack and release time
SmartNR No Limiting W/ Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL
108.5
113.0
RF Power output: 100 mW
constants. The gradual onset of limiting in the design begins below clipping level, which
Pilot tone: 25 to 32 kHz; 5kHz deviation
reduces the measured figure for SNR without limiting by 4.5 dB)
Frequency stability: ± 0.002%
THD: 0.2% (typical)
Deviation: ± 75 kHz (max)
Input Dynamic Range: 125 dB (with full Tx limiting)
Spurious radiation: 90 dB below carrier
Controls: Two position “ON-OFF” power switch
Equivalent input noise: –120 dBV (A-weighted)
Audio input gain knob
Input level: Nominal 2 mV to 300 mV, before limiting.
Low rolloff pot on side panel
Greater than 1V maximum, with limiting.
Two 16-position rotary switches adjust
Input impedance: Taps provided for 200, 4k, 40k Ohm
transmitter frequency
Input limiter: Dual envelope “soft” limiter; greater than
Audio muting from pin 5 on mic connector
30 dB range
Audio Input Jack: Switchcraft 5 pin locking (TA5F)
Gain control range: 43 dB; semi-log rotary control
Antenna: Detachable, flexible wire supplied; 50 Ohm port
Modulation indicators: Dual bicolor LEDs indicate modulation of
allows connection to test equipment
-20, -10, 0 and +10dB referenced to full
Battery: Precision compartment auto-adjusts to accept any
modulation
known alkaline 9 Volt battery. (We’ve tried 243
Audio Performance (overall system):
different ones.)
Frequency Response: 32 Hz to 20 kHz (+/-1dB)
Battery Life: 5 hours (alkaline); 10 hours (lithium)
Low freq. roll-off adjustment: –18 dB/octave; adjustable from
Weight: 6.98 ozs. - 198 grams (including lithium 9V battery
35Hz to 150Hz
and antenna)
Dimensions: 3.17 x 2.48 x .84 inches
Emission Designator: 180KF3E
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
February 2, 2006
(20 pages)
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