Maxon SD-274 User Manual
SD-270 Series Data Radio
User Manual
January 2017
1
FCC RF Exposure Compliance Requirements
The Federal Communications Commission (FCC), with its action in General Docket
93-62, November 7, 1997, has adopted a safety standard for human expo su re to
Radio Frequency (RF) electromagnetic energy emitted by FCC regulated equipment.
Friendcom subscribes to the same safety standard for the use of its products. Proper
operation of this radio will result in user exposure far below the Occupational Sa fety
and Health (OSHA) and Federal Communications Commission limits.
About your SD-270 Series Data Radio
The SD-270 Series is a PLL synthesized 5-watt FM transceiver module, which is
designed for data transmission and voice communication. It can support
pre -emphasis, squelch CTCSS/DCS and audio amplifier. Two-point modulation
technology pro vi des a good low frequency response and POCSAG protocol is
optional. The radio has a fast start-up time, low power consumption, and the
optional modem boards from 1200-19200 bps add extra applications for its use. The
die cast aluminum cabinet and lid provides resistance to RF interference with the
most requested mechanical footprint in the industry.
Should you have questions regarding the operation of the radio, please consult us at:
Maxon America, Inc. Phone: 913-859-9515
11535 W. 83rd Terrace Email: maxon@maxonamerica.com
L e n e x a , KS 66214 Website: www.maxonamerica.com
2
Features
C E , F C C , MRC & AS/NZS 4295: 2015 certified
Programmable 16 channels (Dip Switch Select)
External Software Channel Steering
Configurable Power Sa ve Fe at ure
FSK, 4FSK& GMSK Modem Options; Supports 19200 bps
Frequency Step 6.25KHz
CTCSS/DCS Encode/Decode
Fast start-up time: 5ms
SQ Programmable via PC (6 Levels)
POCSAG Modulation (Optional)
PC Programmable & Software Tune & Calibration
Applications
Industrial telemetry & wireless remote control or Paging system
Gas and oil flow monitoring
Electricity, water and gas utilities
Earthquake, weather, environmental protection
Vehicle tracking and asset tracking systems
Water monitoring, waste water management and irrigation control
Railway, police, army automation system
Aerial defense and fire alarm system
Urban lighting control
3
Specifications
GENERAL
Working Frequency
V: 136-174 MHz
U0: 400-440 MHz
U1: 430-470 MHz
U2: 450-490 MHz
Channel Spacing
12.5KHz/25KHz Programmable
Modulation Type
F3D/F3E
Number of Channels
16
Nominal Working Voltage
12V DC
Extreme Working Voltage
9.6 V～16V DC
Storage Temperature
-40℃～+80℃
Operating Temperature
-30℃～+65℃
Current
Consumption
Standby
＜100mA (65 mA @ 12V)
Transmit 5 watts RF Power
＜1.5A
Transmit 1 watt RF Power
＜1A
TX to RX Attack Time
＜5ms
RX to TX attack time
＜5ms
Frequency Error
＜2.5ppm
Antenna Connector
BNC 50Ω
External interface
DB15 Female
4
TRANSMITTER Specification
R F P o w e r
1W/2W/3W/4W/5W Programmable
Frequency
Deviation
25KHz Channel Spacing
＜5KHz
12.5KHz Channel Spacing
＜2.5KHz
Subsonic
0.5KHz
Audio Response
25KHz Channel Spacing
300Hz～3KHz +1/-3dB
12.5KHz Channel Spacing
300Hz～2.55KHz +1/-3dB
Adjacent
Channel Power
25KHz Channel Spacing
＜-70dBc
12.5KHz Channel Spacing
＜-65dBc
Conducted Spurious Emission
＜1GHz,＜-36dBm
＞1GHz,＜-30dBm
Modulation
Sensitivity
V o i c e
8~15mV
Data
80~130mV
TX SNR
25KHz Channel Spacing
＞45dB
12.5KHz Channel Spacing
＞40dB
RECEIVER Specification
RX Sensitivity
(12dB SINAD)
25KHz Channel Spacing
＜-119dBm Ex treme ＜-115dBm
12.5KHz Channel Spacing
＜-119dBm Extreme＜-115dBm
Adjacent Channel
Selectivity
25KHz Channel Spacing
＞70dB
12.5KHz Channel Spacing
＞60dB
Image Rejection
＞70dB
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