SD-171/SD-174
Maxon Synthesized 5 Watt RF Data Link Telemetry Module
Features:
- Synthesized Frequency Tuning
- 1
or 5 Watts Programmable
RF Output Power - 148-174 MHz VHF 450-490 MHz UHF
- Programmable up to 16 Channels (via dip switch or serial command)
- CTCSS / DCS Tone Signalling
- 2-Tone Decode
- Scan / Power Save
- LED Status Indicator Time-out-timer / Busy Ch Lockout
- Marked Idle / TX Delay
- Courtesy Beep
- Programmable Wide/Narrow Band
- Operates from 9V to 18 VDC
- Complies with NTIA Specifications
- Die-Cast Aluminum Housing
- Time-Out-Timer Function
- 15-Pin Interface Connector (DB15) (See connector pin-outs below)
- PC Programming via Software and Cable (optional)
General Specifications:
| Maxon VHF SD-171 | Maxon UHF SD-174 | |
| Frequency Range | 148-174 MHz | 450-490 MHz |
| FCC ID Number | pending | pending |
| FCC Parts | Parts 22, 74, 90.210 | |
| Channels | 1 to16 dip switch selectable or external serial command | |
| Channel Spacing | 12.5 / 15 / 25 / 30 KHz | 12.5 / 25 KHz |
| Channel Stepping |
5.0 / 6.25 / 7.5 KHz |
5.0 / 6.25 KHz |
| Channel Spread | 26 MHz | 40 MHz |
| Frequency Stability |
±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 |
|
| Attack Time |
RX to TX - 20 ms / TX to RX - 20 ms (no power saving) |
|
| PLL Lock Time | 10 ms | |
| Squelch Attack Time |
RF Level @ Threshold - 40 ms / RF Level @ Threshold +20dB - 30 ms |
|
| Squelch Decay |
5 ms min / 20 ms max |
|
| Baud Rate GMSK |
Up to 9600 |
|
| Baud Rate FFSK |
Up to 4800 |
|
| Dimensions [HWD] |
4-5/16" x 2-5/16" x 1-1/4" [125 x 58 x 32 mm] |
|
| Weight |
8.9 oz [253 gm] |
|
| Materials |
Die-cast Aluminum |
|
| IC Certification Number |
pending |
pending |
ANSI/TIA/EIA-603 Receiver Specifications:
| Maxon VHF SD-171 | Maxon UHF SD-174 | |
| Frequency Stability | ±2.5 PPM | |
| Sensitivity (12dB SINAD) | 0.25 uV VHF | 0.25 uV UHF |
| Sensitivity (20dB Quieting) | < 0.5 uv @ center channel | |
| Selectivity | 70dB (25 KHz) / 65dB (12.5 KHz) | |
| Spurious Rejection |
-65dB |
|
| Intermodulation |
-70dB |
|
| Audio Output |
250 mV @ 8 Ohms (filtered) 250 mV RMS @ 10k Ohms (unfiltered) |
|
| Audio Distortion |
< 5% @ 1 KHz |
|
| Hum & Noise |
-40 dB |
|
| Input Impedance | 50 ohms | |
ANSI/TIA/EIA-603 Transmitter Specifications:
| Maxon VHF SD-171 | Maxon UHF SD-174 | |
| RF Power Output. |
1 or 5 Watts programmable |
|
| Frequency Stability | ±2.5 PPM | |
| Modulation | 11K0F3E / 16K0F3E / 19K6F3E | |
| Spurious & Harmonics | -60dBc | |
| FM Hum & Noise |
-40dB |
|
| Audio Distortion | <2% @ rated modulation | |
| Modulation Limiting | 2.5 KHz max. [12.5 KHz] , 5 KHz max. [25 KHz] | |
| Unfiltered Modulation | 100 mV RMS (input) 7 mV RMS (filtered mod input) | |

Q4 2025 Products and Accessories Guide
Maxon America's LMR, DMR, JobSite, Data Radios & Helmet Communication Equipment and Accessories
Maxon data telemetery two way radio utilize the latest technology in its
design and manufacturing. Ideal for any system design where high performance RF specifications, fast TX/RX attack times, and compact size are a requirement. High specifications permit integration into systems demanding the utmost performance in congested frequency environments.Maxon America, Inc. is a supplier of two-way and data radio products for North and South America. Formerly known as TecNet International, Inc.
| SD-171V | SD-170 Series VHF Synthesized RF Data Radio, 148-174 MHz, programmable 5 Watts output and up to 16 channels. CTCSS/DCS Tone signalling, 2-Tone decode. Scan, TOT, LED status indicator |


