TN387 UT-4E UHF 700 / 800 / 900 MHz MT-4E Transmitter
MT-4 Radio Systems
TECHNICAL NOTES
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CODANCOMMS.COMTECHNICAL NOTE:
TN387, REV 6-0-0, © May 2014
CANADA/US +1 250 382 8268 | TOLL FREE +1 800 664 4066
The UT-4E UHF 700 / 800 / 900 MHz transmitter is an FM radio module capable of analog
operation in 12.5 KHz (narrowband), 25 KHz (wideband) or 20 KHz (NPSPAC) channels. A
fi rmware upgrade may be purchased to allow P25 digital operation. The UT-4E UHF 700
/ 800 / 900 MHz transmitter operates in one of two frequency bands: 768 to 869 MHz or
896 to 960 MHz. A modular design allows each of the transmitter’s internal modules to be
individually assembled and tested. This facilitates construction, tuning and maintenance as
well as troubleshooting procedures. The transmitter can be programmed with up to 2 banks
of 16 channels each.
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
Specifi cations
Frequency Bands 768 - 869 MHz / 896 - 960 MHz
Channel Spacing 12.5 and 25 KHz (20 KHz NPSPAC; 850 only)
Frequency Switching Range Full Band; ± 0.5 MHz for VSWR alarm
RF Output Power 0.5 to 3.0 Watts adjustable
Duty Cycle 100% (-30°C to +60°C)
Undesired Emissions (Conducted Spurious) ≤ -80 dBc (-45 dBm @ 3.0 Watts) 850
≤ -65 dBc (-30 dBm @ 3.0 Watts) 900
Undesired Emissions ≤ -50 dBc; Narrowband Analog / ≤ -60 dBc; Wideband Analog
(Adjacent Channel Power Ratio) ≤ -67 dBc; Digital
Intermodulation Attenuation ≥ 40 dB
FM Hum & Noise Ratio ≥ 34 dB; NB ; ≥ 40 dB; WB ; ≥ 35 dB; NPSPAC (850)
≥ 31 dB; NB ; ≥ 37 dB; WB ; ≥ 35 dB; NPSPAC (900)
Carrier Frequency Stability ± 0.1 ppm (-30°C to +60°C)
Emission Designators Analog: 11K0F3E (Narrowband); 16K0F3E (Wideband)
Analog: 14K0F3E (20 KHz NPSPAC 850 only)
Paging: 9K20F1D (Narrowband); 16K0F1D (Wideband)
P25 Digital: 8K10F1E (Digital Voice); 8K10F1D (Digital Data)
Audio Distortion (60% of maximum deviation) ≤ 3.0% (-30°C to +60°C)
VSWR Protection ≤ 20:1 VSWR (All Phase Angles)
Operating Temperature -30°C to +60°C
Standby Current ≤ 115 mA / ≤ 145 mA with encryption module
Transmit Current (3.0 W) ≤ 1.80 A
Models Available
UT-4E850-00-300 12.5 / 25 KHz Bandwidth, 0.5 - 3.0 W, 768 - 869 MHz
UT-4E900-00-300 12.5 / 25 KHz Bandwidth, 0.5 - 3.0 W, 896 - 960 MHz
Transmitter Operating Frequency
The transmitter is initially aligned at the factory for the frequency shown on the label on the front panel. For a small
frequency change, no re-alignment of the transmitter may be required. If the frequency change is greater than
±0.5 MHz from the frequency at which the last complete transmitter alignment was performed, the VSWR alarm
/ overload (if used) will need to be realigned. To align and / or adjust the transmitter the outer cover needs to be
removed, the transmitter needs to be plugged into the subrack via a cable and / or extender card and power must
be applied to the system. A 50 dummy load should be connected to the RF output when transmitting.
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