TN247 VR-4E VHF MT-4E Receiver
MT-4 Radio Systems
TECHNICAL NOTES
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LMRSALES@CODANCOMMS.COM
CODANCOMMS.COMTECHNICAL NOTE:
TN247, REV 4-1-0, © Mar 2013
CANADA/US +1 250 382 8268 | TOLL FREE +1 800 664 4066
The VR-4E VHF receiver is an FM radio module capable of analog operation in 12.5 KHz
(narrowband) or 25 KHz (wideband) channels. A fi rmware upgrade may be purchased to
allow P25 digital operation. The VR-4E VHF receiver operates over the frequency band
from 136 to 174 MHz. A modular design allows each of the receiver’s internal modules to be
individually assembled and tested. This facilitates construction, tuning and maintenance as
well as troubleshooting procedures. The receiver can be programmed with up to 2 banks of
16 channels each.
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
Specifi cations
Frequency Band 136 - 174 MHz
Channel Spacing 12.5, 15, 25 and 30 KHz
Frequency Switching Range ± 2 MHz
Reference Sensitivity ≤ -118 dBm (.280 μV)
(12 dB SINAD and 5% BER)
Adjacent Channel Rejection (Class A) ≥ 45 dB; NB Analog / ≥ 75 dB; WB Analog / ≥ 60 dB; Digital
Adjacent Channel Rejection (Class B) ≥ 40 dB; NB Analog / ≥ 70 dB; WB Analog / ≥ 60 dB; Digital
Conducted Spurious Output Power (Analog) ≤ -95 dBm (Class A) / ≤ -57 dBm (Class B)
Intermodulation Rejection ≥ 75 dB Analog / ≥ 80 dB Digital (Class A)
≥ 70 dB Analog / ≥ 70 dB Digital (Class B)
Hum & Noise Ratio ≥ 34 dB Narrowband / ≥ 40 dB Wideband
L.O. Frequency Stability ± 1.0 ppm (-30°C to +60°C)
Audio Distortion (Analog and Digital) ≤ 2.0 % (25°C); ≤ 3.0 % (-30°C to +60°C)
Audio Output Level (600 Balanced) ≤ +3.0 dBm
Operating Temperature -30°C to +60°C
Supply Current (Class A) ≤ 250 mA / ≤ 280 mA with encryption module
Supply Current (Class B) ≤ 115 mA / ≤ 145 mA with encryption module
Models Available
VR-4E150-A0-000 12.5 / 25 KHz Bandwidth, 136 - 174 MHz, Class A
VR-4E150-00-000 12.5 / 25 KHz Bandwidth, 136 - 174 MHz, Class B
Receiver Operating Frequency
The receiver 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 receiver may be required. If the frequency change is greater than ±2 MHz
from the frequency at which the last complete receiver alignment was performed, the RF Preselector will need to
be realigned. To align and / or adjust the receiver, the outer cover needs to be removed; the receiver needs to be
plugged into the subrack via a cable and / or extender card; and power must be applied to the system.
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