# SATEL-B2 Radio Motherboard

A modular motherboard platform that powers and connects compatible SATEL OEM radio modules, available as board-level assemblies or in an aluminum enclosure.

- Product page: https://catalog.satelusa.com/products/satel-b2/
- Category: Radio modems
- Status: current
- Part numbers: YR0000-MP1, YR0000-MP2, YR0000-MP3
- Manufacturer: SATEL Oy
- Image: https://catalog.satelusa.com/images/products/satel-b2.webp

## Overview

SATEL-B2 is a power and interface carrier for compatible SATEL radio modules. It accepts a +7 to +27.5 VDC supply, regulates power for the installed module, and exposes the radio through a primary RS-232 data port. A second RS-232 port supports diagnostics and SL commands, while one general-purpose input and one general-purpose output provide additional host control.

The modular design lets equipment manufacturers use the same carrier architecture with different radio modules and mechanical formats. Radio frequency, output power, encryption and regional approval details depend on the installed module and should be checked in that module's integration guide.

### Enclosed assembly formats

- **ME1:** Aluminum enclosure with mounting ears, D15 interface and TNC female antenna connector
- **ME2:** ME1 configuration with a DIN-rail clip
- **ME3:** Enclosed DIN-rail configuration with a BNC female antenna connector

The bare motherboard assembly order codes are YR0000-MP1, YR0000-MP2 and YR0000-MP3. Complete assemblies combine the desired mechanical suffix with a compatible radio-module code. For North American applications, current options include the SATEL-TR4+ YM7470/YM7475 and SATEL-TR489 US/CA YM8820/YM8825 variants.

SATEL-B2 assemblies using SATEL-TR4+, SATEL-TR49, SATEL-TR489 or SATEL-TR300 retain the connector and pinout used by the SATELLINE-M3-TR1, providing a migration path for existing integrations. The SATEL-TR489 combination similarly supports migration from SATELLINE-M3-TR1 869 designs.

## Highlights

- Accepts compatible SATEL-TR4+ and SATEL-TR489 radio modules
- Regulates a +7 to +27.5 VDC input for the installed radio module
- Provides two RS-232 ports plus one general-purpose input and output
- Available in board-level MP and enclosed ME assembly formats

## Available variants

- **YR0000-MP1:** B2A motherboard with a horizontal female 26-pin header, heat-transfer hardware and mounting screws
  - Assembly format: B2A board-level assembly with horizontal female 26-pin header
- **YR0000-MP2:** MP1 components plus a D15 adapter
  - Assembly format: MP1 board-level assembly with D15 adapter
- **YR0000-MP3:** B2B motherboard with a vertical male 26-pin header, heat-transfer hardware and mounting screws
  - Assembly format: B2B board-level assembly with vertical male 26-pin header

## Specifications

### Power and interfaces

- **Operating voltage:** +7 to +27.5 VDC
- **Primary data interface:** RS-232 Port 1
- **Secondary interface:** RS-232 Port 2 for diagnostics and SL commands
- **General-purpose I/O:** One input and one output
- **B2A connector:** 26-pin horizontal female header, 1.27 mm pitch
- **B2B connector:** 26-pin vertical male header, 1.27 mm pitch

### Power consumption with radio installed

- **SATEL-TR4+ receive:** Less than 1.3 W
- **SATEL-TR4+ transmit:** Less than 3.0 W at 0.5 W RF; less than 8.0 W at 1 W RF
- **SATEL-TR489 receive:** Less than 1.2 W
- **SATEL-TR489 transmit:** Less than 3.0 W at 0.5 W RF; less than 7.0 W at 1 W RF

### Environmental and construction

- **Functional temperature range:** −30 to +65 °C
- **Storage temperature range:** −40 to +85 °C
- **Construction:** Board stack without housing or aluminum enclosure

### Assembly options

- **MP1:** B2A board-level assembly with horizontal female 26-pin header
- **MP2:** MP1 board-level assembly with D15 adapter
- **MP3:** B2B board-level assembly with vertical male 26-pin header
- **ME1:** Aluminum enclosure with mounting ears and TNC female antenna connector
- **ME2:** ME1 enclosure with DIN clip
- **ME3:** Aluminum enclosure with mounting ears, DIN clip and BNC female antenna connector

## Compatibility

- SATEL-TR4+
- SATEL-TR489
- SATEL-TR49, SATEL-TR300 and SATELLINE-M3-TR9 by availability
- SATELLINE-M3-TR1 connector and pinout

## Documents

- [Product brochure](https://catalog.satelusa.com/documents/satel-b2/SATEL_Motherboard_07_2025.pdf) (datasheet)
- [User Guide](https://catalog.satelusa.com/documents/satel-b2/SATEL-B2_UserGuide_v1_3.pdf) (manual, version 1.3)
- [Quick Guide](https://catalog.satelusa.com/documents/satel-b2/SATEL-B2_QuickGuide_v1_3.pdf) (guide, version 1.3)

## Related products

- [SATEL-TR4+ Radio Module](https://catalog.satelusa.com/products/satel-tr4-plus/)
- [SATEL-TR489 Radio Module](https://catalog.satelusa.com/products/satel-tr489/)
- [SATELLINE M3-TR9 Radio Module](https://catalog.satelusa.com/products/satelline-m3-tr9/)