# SATEL Proof-TR4+

A 1 W, IP69K UHF radio modem for 403–473 MHz operation with encryption support.

- Product page: https://catalog.satelusa.com/products/ym6577/
- Category: Radio modems
- Status: current
- Part number: YM6577
- Manufacturer: SATEL Oy
- Image: https://catalog.satelusa.com/images/products/satel-proof.webp

## Overview

SATEL Proof-TR4+ is a rugged UHF radio modem for machine control, smart farming, marine systems and other installations exposed to dirt, vibration, dust and water. Its sealed aluminum enclosure and protected electrical interfaces are designed for demanding outdoor environments.

The radio provides a transparent RS-232 data link across the 403–473 MHz band and supports multiple SATEL radio protocols. The YM6577 model includes AES encryption support for applications that require privacy over the radio link.

## Highlights

- Wide 403–473 MHz tuning range with up to 1 W transmitter power
- IP67 and IP69K-rated die-cast aluminum enclosure
- AES128 air-interface encryption support
- Surge-protected power, data and antenna interfaces with GNSS filtering

## Specifications

### Radio

- **Frequency range:** 403–473 MHz
- **Carrier power:** 0.01–1 W, programmable
- **Channel spacing:** 12.5, 20 or 25 kHz
- **Radio data speed:** Up to 28,800 bps
- **Communication mode:** Half-duplex
- **Encryption:** AES128; AES256 available as an order option

### Data interface

- **Interface:** RS-232 asynchronous serial
- **Serial data speed:** 4,800–115,200 bps
- **Power and data connector:** Deutsch DT04-6P-CL09

### Mechanical and electrical

- **Operating voltage:** +7–27.5 VDC
- **Dimensions:** 174 × 95 × 46 mm
- **Weight:** Less than 500 g
- **Environmental rating:** IP67 / IP69K when the mating connector is correctly assembled
- **Antenna connector:** TNC female, 50 Ω

## Compatibility

- SATEL-EASy+
- SATEL-TR4+
- SATELLINE-EASy
- SATELLINE-TR1

## Documents

- [Proof-TR4+ and Proof-TR9 product brochure](https://catalog.satelusa.com/documents/satel-proof-series/SATEL-Proof_TR4_TR9-03_2026.pdf) (datasheet)
- [Proof-TR4+, Proof-TR9 and Proof-TR489 user guide](https://catalog.satelusa.com/documents/satel-proof-series/SATEL-Proof-TR4_TR9_TR489_User-Guide_v3.7.pdf) (manual, version 3.7)

## Related products

- [SATEL-EASy+](https://catalog.satelusa.com/products/satel-easy-plus/)
- [SATEL Proof-TR9](https://catalog.satelusa.com/products/ym6411/)
- [SATEL Proof-TR489](https://catalog.satelusa.com/products/ym6930/)