> For the complete documentation index, see [llms.txt](https://kraksat.gitbook.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kraksat.gitbook.io/documentation/sr-nano-bus-platform/untitled.md).

# SR-NANO-BUS platform

SatRevolution has provided and personalized a scalable satellite platform SR-NANO-BUS, which includes:

* 1U Mechanical Structure
* Electrical Power System
* RF Communication Module
* Basic On-board Computer

The platform is described based on datasheets provided by the manufacturer. More details are available at <https://cubesatworld.com/>.

## 1U mechanical structure

Single unit cubesat structure that fulfills international standards. It is designed to provide the necessary mechanical durability and thermal conductivity
.

| Properties                                                          |
| ------------------------------------------------------------------- |
| Size: 109.7 x 109.7 x 113.5 \[mm3]                                  |
| Mass: 96 g                                                          |
| Material: Aluminum 7075 alloy                                       |
| Manufacturing details: CNC manufactured, hard anodized and oxidized |
| Power switches: 3 safety deployment switches and 1 RBF pins         |
| Separation springs: 2                                               |

![](/files/-L_PBeGEjbA0xJqA5IYT)

## EPS module&#x20;

Electrical Power System is responsible for conversion of energy acquired by the solar panels and distribution of the power to the payload and platform subsystems, such as OBC and CM.&#x20;

| Features                                 |
| ---------------------------------------- |
| 2 redundant power buses                  |
| Battery supervisory circuit              |
| Thermal control of circuit and batteries |

| Details                                                                                   |
| ----------------------------------------------------------------------------------------- |
| Fully redundant and stabilized output voltages: 12 V (1.6 A), 3.3 V (1 A), 1.8 V (0.1 A). |
| Single battery capacity: 3200 mAh                                                         |
| Pack size: 3 batteries                                                                    |
| Max stored energy: 80 Wh                                                                  |

| Properties                           |
| ------------------------------------ |
| Mass: 590 g (with pack of batteries) |
| Size: 96x96x25 \[mm3]                |

## CM module&#x20;

RF communication module is responsible for TT\&C uplink and downlink. The module consists of 2 UHF transceivers.&#x20;

| Features                                                                                                                    |
| --------------------------------------------------------------------------------------------------------------------------- |
| Operational frequency: 433 MHz                                                                                              |
| Transmission data rate: 9600 b/s                                                                                            |
| Range: 400-500 km                                                                                                           |
| TX modulation: 2GFSK 9600 bps, AFSK 1200 bps                                                                                |
| RX modulation: 2GFSK 9600 bps                                                                                               |
| <p>Main components:</p><p>Ultra-Low Power microcontroller MSP430FR</p><p>Silicon Laboratories Si446x family RF radio IC</p> |

| Details                                  |
| ---------------------------------------- |
| Supply voltage: 12 V, 3.3 V              |
| UHF max RF power output: 30 dBm          |
| Max current consumption at RX: 15 mA     |
| Max current consumption at TX: 250 mA    |
| Normal current consumption at TX: 117 mA |

| Properties             |
| ---------------------- |
| Mass: 37 g             |
| Size: 96x96x6.6 \[mm3] |

## OBC module&#x20;

Basic version of On-board Computer. Cubesat subsystem for payload control and communication with medium computing power and external MRAM memory.&#x20;

| Features                                                               |
| ---------------------------------------------------------------------- |
| Main processor: MSP430FR5994, 16MHz, 256KB FRAM, Ultra Low-Power Modes |
| Inner module communications (IMC)                                      |

| Details                                                                            |
| ---------------------------------------------------------------------------------- |
| Current consumption: 120 μA/MHz (processor) + other components for payload control |
| Power switches on 3.3 V and 12 V                                                   |
| Connector FX10A-168                                                                |

| Properties           |
| -------------------- |
| Mass: 37 g           |
| Size: 96x96x5 \[mm3] |


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