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Maxon's SD-125 RF Data Link Radio Telemetry modules allow RF signals to be exchanged with devices like emergency assistance "call boxes", irrigation systems and electronic signs, making them perform with more reliability. Compact size and multi-voltage DC connection capability gives the module flexibility in use. Add an external modem, and up to 1200 BPS data can also be exchanged, further extending the module's versatility in and around your World.

Whether implementing a new system or installing into an existing system, the Maxon family of data telemetry radios have been the choice of OEM and end-users worldwide for over 25 years.

1 or 5 Watts RF Output
148-174 MHz VHF - V2 (Current Model listed on this page)
440-470 MHz UHF - U2
400-430 MHz UHF - U1
Programmable up to 16 Channels
16 Channels (Dip Switch Select)
(internal dip switch)
Programmable Wide/Narrow Band
Operates from 9V to 18 VDC
Carrier Squelch ONLY
DB-9 Male Connector
12.5/25 kHz Channel Spacing
Carrier Detect
Busy Channel Lockout
BNC Female Antenna Connector
Carrier Detect
Complies with NTIA Specifications
Die-Cast Aluminum Housing
TX Time Out Timer

Applications:

Water/Waste Treatment Plants
Oil and Gas Field SCADA
Security/Alarm System
Gate Systems
Remote Controls
Commercial Sign Control
Automatic Vehicle Location
Murphy/Kill Switches
Weather Monitoring
Irrigation Systems
Emergency Call Boxes
Low Power Repeaters


General Specifications
Parameter:	Maxon VHF SD-125V2	Maxon UHF SD-125U1/2
Frequency Range	148-174 MHz	440-470 MHz U2 400-430 MHz U1
FCC ID Number	F3JSD125V2	F3JSD125U1 (U2)
FCC Parts	Parts 22, 74, 90, 210
Channels	1 to16 dip switch selectable
Channel Spacing	12.5 / 15 / 25 / 30 KHz
Channel Stepping	5 & 6.25 KHz
Channel Spread	26 MHz	30 MHz
Frequency Stability	±5.0 ppm	>±2.5 ppm
Operating Temperature	-22° to +140° F (-30° to + 60° C)
Storage Temperature	-40° to +176° F (-40° to + 80° C)
Input Voltage	9V - 18V DC, 13V nominal
Current Drain @9V	56 mA Standby / 73 mA Rx / 1.8A Tx
Current Drain @13V	42 mA Standby / 63 mA Rx / 1.4A Tx
Current Drain @18V	32 mA Standby / 58 mA Rx / .9A Tx
Operating Rating	90 : 5 : 5 - Standby/Rx/Tx [max settings]
Dimensions [HWD]	4 5/8" x 2 7/16" x 1 3/16" [117 x 62 x 30 mm]
Weight	7.7 oz [218 gm]
Materials	Die-cast Aluminum
IC Certification Number	153 195 332	153 195 333A

ANSI/TIA/EIA-603 Receiver Specifications
Parameter:	Maxon VHF SD-125V2	Maxon UHF SD-125U1/2
Frequency Stability	±5 PPM	±2.5 PPM
Sensitivity (12dB SINAD)	0.28 uV VHF	0.35 uV UHF
Sensitivity (20dB Quieting)	< 0.5 uv @ center channel
Selectivity	60dB (25 KHz) / 50dB (12.5 KHz)
Spurious Rejection	-70dB
Intermodulation	-65dB
Audio Output	2.5V @ 600 Ohms; method < 10% THD level
Audio Distortion	< 5% @ 1 KHz
Hum & Noise	-40 dB
Input Impedance	50 ohms

ANSI/TIA/EIA-603 Transmitter Specifications
Parameter:	Maxon VHF SD-125V2	Maxon UHF SD-125U1/2
RF Power Output.	1 or 5 Watts per channel
Frequency Stability	±5 PPM	±2.5 PPM
Modulation	11K0F3E / 16K0F3E / 19K6F3E
Spurious & Harmonics	-60dBc
FM Hum & Noise	-40dB
Audio Distortion	<10% @ rated modulation
Modulation Limiting	2.5 KHz max. [12.5 KHz] , 5 KHz max. [25 KHz]
Modulation Sensitivity	100 mV RMS @ 60% peak dev.

NOTE: Some features indicated by specifications listed are prohibited by FCC rule and are not available on models sold in the U.S. or its territories. Note: Features and specifications subject to change without notice.