# SATEL-TR4+ Radio Module

A compact 1 W UHF transceiver module for integrating dependable 403–473 MHz data connectivity into OEM equipment.

- Product page: https://catalog.satelusa.com/products/satel-tr4-plus/
- Category: Radio modems
- Status: current
- Part numbers: YM7470, YM7475, YM7480, YM7485
- Manufacturer: SATEL Oy
- Image: https://catalog.satelusa.com/images/products/satel-radio-module.webp

## Overview

SATEL-TR4+ is a compact UHF data transceiver intended for integration into space-constrained OEM equipment. Its RF-shielded single-board construction suits applications such as GNSS surveying rovers, RTK base stations, machine control and other embedded telemetry systems.

The module combines a 403–473 MHz tuning range with selectable 12.5, 20 and 25 kHz channels. Native SATEL modes include 4FSK, 8FSK and 16FSK, while additional compatibility modes support interoperability with several established third-party radio protocols. Repeater operation, addressing, channel lists, FEC and air-interface encryption can be configured for the application.

Configuration is available through SATEL NETCO DEVICE, SATEL Configuration Manager or SL commands over the serial interface. Integrators can use the module by itself or pair it with a SATEL-B2 motherboard for power regulation, RS-232 connectivity and alternative mechanical formats.

## Highlights

- 70 MHz tuning range with software-selectable channel widths
- Programmable transmitter output from 10 mW to 1 W
- Compact RF-shielded PCB for host-device integration
- AES128 support, with AES256 available as an order option

## Available variants

- **YM7470:** AES128 support, DTE connector on the bottom
  - AES128 support: Supported
  - DTE connector position: Bottom
- **YM7475:** Without AES128 support, DTE connector on the bottom
  - AES128 support: Not supported
  - DTE connector position: Bottom
- **YM7480:** AES128 support, DTE connector on the top
  - AES128 support: Supported
  - DTE connector position: Top
- **YM7485:** Without AES128 support, DTE connector on the top
  - AES128 support: Not supported
  - DTE connector position: Top

## Specifications

### Radio

- **Frequency range:** 403–473 MHz
- **Tuning range:** 70 MHz
- **Channel width:** 12.5, 20 or 25 kHz, software selectable
- **Frequency step:** 6.25 kHz; 10 kHz with 20 kHz channel width
- **Modulation:** 4FSK, 8FSK and 16FSK; GMSK subject to availability
- **Carrier power:** 0.01, 0.02, 0.05, 0.1, 0.2, 0.5 or 1 W, programmable
- **Communication mode:** Half-duplex
- **Receiver sensitivity:** Down to typically −115 dBm, depending on modulation, channel width and FEC
- **Maximum radio data speed:** 28,800 bps

### Data interface and configuration

- **Electrical interface:** CMOS-UART with 1.8–3.3 V I/O
- **Serial data speed:** 9,600–115,200 bps
- **Interface connector:** 20-pin, 1.27 mm pitch socket
- **Air-interface encryption:** AES128; AES256 available as an order option
- **Configuration:** SATEL NETCO DEVICE, SATEL Configuration Manager or SL commands

### Mechanical and electrical

- **Operating voltage:** +3.8–5.5 VDC
- **Typical power consumption:** 0.86–0.89 W receiving; 4.8 W transmitting at 1 W RF output; 0.3 W sleep
- **Functional temperature range:** −30 to +70 °C
- **Storage temperature range:** −40 to +85 °C
- **Construction:** PCB with sheet-metal RF/EMI shielding
- **Dimensions:** 57 × 36 × 6.9 mm
- **Weight:** 20 g
- **Antenna connector:** 50 Ω Hirose U.FL-compatible connector

### North American approvals

- **FCC ID:** MRBSATEL-TA40
- **ISED certification:** 2422A-SATELTA40

## Compatibility

- SATELLINE-M3-TR4
- SATELLINE-EASy
- SATELLINE-EASy Pro
- SATEL-EASy+

## Documents

- [Product brochure](https://catalog.satelusa.com/documents/satel-tr4-plus/SATEL-TR4-2022_01.pdf) (datasheet)
- [TR4+ and R4+ Integration Guide](https://catalog.satelusa.com/documents/satel-tr4-plus/SATEL-TR4_R4_Integration-guide_v3.0.pdf) (guide, version 3.0)

## Related products

- [SATEL-B2 Radio Motherboard](https://catalog.satelusa.com/products/satel-b2/)
- [SATEL-EASy+](https://catalog.satelusa.com/products/satel-easy-plus/)