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SPACE / Avionics & communications / REVIEWED 2026-09-11

E03Telemetry & command radio

Maintain the spacecraft’s command and health link.

Manufacturers & products

Telemetry, tracking and command equipment keeps the spacecraft controllable. A radio carrying high-rate payload data is not automatically a safe-mode TT&C transponder, and tracking/ranging functions are not universal.

These are sourcing candidates, not a confirmed Starlink supply chain.

manufacturer

GomSpace

NanoCom AX100

A compact UHF half-duplex transceiver provides command and telemetry links for small spacecraft, with selectable band configurations and published rate-dependent receiver performance. [7][3]

Company location: Aalborg, Denmark

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

Confirm the current flight configuration and firmware revision; older AX100 datasheets may describe additional band options.

View product & inquiry route

manufacturer

EnduroSat

S-band transceiver

An integrated full-duplex S-band spacecraft transceiver serves telemetry and telecommand with configurable output power and GFSK data rates. [8]

Company location: Sofia, Bulgaria

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

The vendor’s separate high-rate X-band SDR is not the same TT&C product.

View product & inquiry route

manufacturer

ISISPACE

TRXVU VHF/UHF full-duplex transceiver

A spacecraft VHF-uplink/UHF-downlink radio offers a lower-rate command/telemetry architecture backed by a manufacturer inquiry channel and documented radio brochure. [10][11][9]

Company location: Delft, Netherlands

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

Public detailed brochure is older; request the current controlled datasheet and available configuration.

View product & inquiry route

manufacturer

IQ spacecom

XLink S/X space radios

Space radio modules support configurable satellite links and interface with separate ground equipment in the vendor’s end-to-end architecture. [12]

Company location: Berlin, Germany

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

XLink flight radio and AX60 ground modem are separate products; specify TT&C waveform and safe-mode requirements.

View product & inquiry route

manufacturer

Safran Data Systems (Syrlinks brand)

N-STAR / EWC31-NG

A smallsat S/S-band transponder combines telemetry, command and tracking-related capabilities within the Safran product portfolio formerly supplied under Syrlinks. [13][14]

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

Syrlinks merged into Safran Data Systems effective January 2025; it is retained as product branding, not an additional independent supplier.

View product & inquiry route

manufacturer

Satlab

SRS-4

An S-band spacecraft radio offers separate transmit and receive chains with published symbol rates, output control and error-conditioned receiver sensitivity. [15][16]

Company location: Aalborg, Denmark

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

Confirm coding, net user throughput and tracking/ranging features rather than assuming them from symbol rate.

View product & inquiry route

manufacturer

Alén Space

TOTEM SDR / TRISKEL integration

A space software-defined radio platform can form part of an integrated avionics and TT&C system when supplied with the required waveform, front end and control implementation. [4][5]

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

Programmable SDR hardware is not by itself a complete independent safe-mode transponder.

View product & inquiry route

manufacturer

TESAT

S-band and Ku-band TT&C transponder family

Mission transponders provide spacecraft command, telemetry and tracking functions, with the available band and operational modes selected for a particular programme. [2]

Company location: Backnang, Germany

Custom program inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

Ka-band demonstrator status is distinct from the qualified S/Ku offerings.

View product & inquiry route

manufacturer

Rocket Lab

Frontier radios

An expanded spacecraft command/control radio family supports different frequency-band and mission configurations through a unified manufacturer product line and direct technical inquiry. [17][18]

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

Request exact waveform, ranging and network compatibility for the chosen model.

View product & inquiry route

manufacturer

Innoflight

SCR-104 / SCR-154 S-band radios

Space software-defined compact radios provide programmable S-band communications; the same portfolio includes separate higher-band radio and networking products. [6]

Company location: San Diego, California, United States

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

SCR-106 X-band and SCR-208 Ka-band products are not interchangeable with S-band TT&C radios.

View product & inquiry route

manufacturer

CesiumAstro

SDR-1001

A reconfigurable space radio building block supports customer-defined RF processing and can be integrated with other electronics into a mission communications architecture. [1]

Manufacturer inquiry

Request a technical quotation through the manufacturer; current configuration and availability require confirmation.

Product scope & qualifications

Requires an appropriate waveform and RF chain; broad tuning capability does not establish fail-safe TT&C behaviour.

View product & inquiry route

What remains unverified

No listed radio is established as the actual SpaceX TT&C supplier.
Current model availability, firmware support and environmental acceptance remain quotation items.
Some current portfolio pages publish little controlled technical data; older datasheets are identified rather than silently treated as latest revisions.

Where it comes from

A company address is shown separately from a published factory location. Request the manufacturing site and lot traceability for the exact part when sourcing.

What to compare

Band, link direction and duplexing · MHz / GHz
Match spacecraft uplink/downlink sub-bands and half/full-duplex behaviour to the actual ground network.
Safe-mode command path
Check independent boot, acquisition, watchdog/reset, command authentication and recovery when the payload computer is unavailable.
Waveform and coding
Specify modulation, framing, coding, synchronization and network protocol versions; a generic SDR requires implementation.
Sensitivity and RF output · dBm / BER / PER
Compare sensitivity at the stated bit/symbol rate, coding and error criterion, and power at the required modulation.
Tracking and ranging
Verify coherent turnaround, ranging formats and frequency stability only if the mission requires them.
Throughput · kbps / Mbps / kBd
Keep uplink versus downlink, symbol versus bit rate and raw versus net rate separate.
Power and interfaces · W / V
Check receiver-only versus transmit draw, bus-voltage range and data/control connectors.
Maturity and environment
Compare exact flight configuration, mission life, radiation, thermal/vibration evidence and lifecycle status.

Selection & integration notes

Place high-rate payload downlinks in the payload chain unless they also provide the required command and tracking functions.
Frequency tuning range is not permission to operate or proof of compatibility with a ground network.
A full-duplex radio may still need an antenna, filtering and sufficient transmit-to-receive isolation.
General Dynamics explicitly marks its historical S-band TDRSS/DSN transponder and ConDR radio discontinued; neither is listed as a current supplier product here.

Supporting references [19][20]

Published product examples

4 REFERENCES

Specifications belong to the named product and configuration.

NanoCom AX100GomSpace

Band options: 395–405 MHz or 430–440 MHz[7]Select ordered configuration.
Data rate: 0.1–38.4 kbps[7]Half-duplex radio.
RF output: 24–30 dBm[7]Configured output setting.
Sensitivity: −137 dBm[7]100 bps with FEC; do not apply to maximum rate.
Envelope / mass: 65 × 40 × 6.5 mm / 24.5 g[7]Product-page configuration.

Example sources [7]

S-band transceiverEnduroSat

Spacecraft Tx / Rx: 2,200–2,290 / 2,025–2,110 MHz[8]Full duplex.
Data rate / modulation: 5–125 kbps / GFSK[8]Published operating modes.
RF output: 24–33 dBm[8]1 dBm adjustment steps.
Power: 1.2 W Rx idle; up to 11 W transmitting[8]At 12 V; transmit maximum at 33 dBm.
Mass: 246 g ±5%[8]Product-page configuration.

Example sources [8]

SRS-4Satlab

Tx / Rx bands: 2,200–2,290 / 2,025–2,110 MHz[15]Spacecraft transmit / receive.
Symbol rate: 100 kBd–5 MBd[15]Do not equate symbol rate with bit rate.
Receiver sensitivity: −122 dBm[15]<1% PER, 100 kBd BPSK.
Power: Rx / Rx+Tx: 1.5 W / 10.8 W[15]6 V, 20 °C, 5 MBd; transmit at 33 dBm.
Mass: 253 g[15]Published hardware configuration.

Example sources [15]

N-STAR S/S-band transponderSafran Data Systems (Syrlinks brand)

Rx / Tx bands: 2,025–2,110 / 2,200–2,290 MHz[13]Spacecraft receive / transmit.
Uplink / downlink rates: Up to 512 kbps / 2 Mbps[13]Separate link directions.
Mass: 360 g[13]Published product configuration.
RX+TX consumption: 12 W[13]Operating conditions not further specified on product page.

Includes integrated duplexing; confirm coherent/ranging modes and mission configuration.

Example sources [13]

Sources & references

REVIEWED 2026-09-11

Manufacturer pages and technical documents support the linked claims. A review date is not a publication date or stock check.

SDR-1001 CesiumAstro · Publication date not stated
Reconfigurable space radio building block and integration scope.
Accessed 2026-09-10
Products TESAT · Publication date not stated
Space T/R modules, amplifiers, passive RF assemblies and TT&C transponder families; company address.
Accessed 2026-09-10
Products GomSpace · Publication date not stated
Portfolio and Aalborg, Denmark company address.
Accessed 2026-09-10
TOTEM software-defined radio Alén Space · Publication date not stated
Space SDR development and integration platform.
Accessed 2026-09-10
TRISKEL datasheet issue 1.8 Alén Space · Publication date not stated
Integrated avionics and TT&C context for TOTEM radio.
Accessed 2026-09-10
Product info Innoflight · Publication date not stated
Current SCR-104/SCR-154 S-band radios, mission processing portfolio and San Diego contact.
Accessed 2026-09-10
NanoCom AX100 GomSpace · Publication date not stated
UHF half-duplex command/telemetry radio parameters.
Accessed 2026-09-10
S-band transceiver EnduroSat · Publication date not stated
Full-duplex S-band telemetry/command radio parameters.
Accessed 2026-09-10
I want to buy ISISPACE · Publication date not stated
Manufacturer inquiry channel.
Accessed 2026-09-10
Product categories ISISPACE · Publication date not stated
Current VHF/UHF spacecraft transceiver and deployable antenna offerings.
Accessed 2026-09-10
VHF/UHF full-duplex transceiver brochure ISISPACE · Publication date not stated
TRXVU band architecture and manufacturer address; older revision requires current confirmation.
Accessed 2026-09-10
End-to-end satellite communications solution, July 2025 IQ spacecom · Published 2025-07
Space XLink radios and S/X-band patch antennas; ground modem is a separate product.
Accessed 2026-09-10
N-STAR S/S-band transponder for nano-satellites Safran Data Systems · Publication date not stated
N-STAR TT&C transponder mass, frequency, data-rate and power parameters.
Accessed 2026-09-10
Syrlinks joins Safran Data Systems Safran · Published 2025-02-13
Syrlinks legal merger effective January 1, 2025; current product brand.
Accessed 2026-09-10
SRS-4 S-band radio Satlab · Publication date not stated
Radio channel rate, output-power, sensitivity and test-conditioned power draw.
Accessed 2026-09-10
About Satlab Satlab · Publication date not stated
Aalborg company location and sales inquiry route.
Accessed 2026-09-10
A new Frontier in radios Rocket Lab · Published 2025-04-03
Expanded Frontier command/control radio family.
Accessed 2026-09-10
Radios full-suite datasheet v4 Rocket Lab · Publication date not stated
Family configuration selection and manufacturer inquiry.
Accessed 2026-09-10
S-band TDRSS/DSN transponder: discontinued General Dynamics Mission Systems · Publication date not stated
Explicit manufacturer discontinued-product notice; excluded from current offerings.
Accessed 2026-09-10
ConDR configurable digital radio: discontinued General Dynamics Mission Systems · Publication date not stated
Explicit manufacturer discontinued-product notice; excluded from current offerings.
Accessed 2026-09-10