What is the SkyLink915?
The SkyLink915 is an ISM band (902-928 MHz) bi-directional dual radio system designed for UAS Command and Control (C2). It provides a protocol-agnostic autopilot telemetry interface, frequency hopping for interference mitigation, and integrated status monitoring to meet RTCA DO-377A requirements for data transfer, security, and routing.
What are the key features of the SkyLink915?
Key features include dual radio architecture for path diversity, frequency hopping for frequency diversity, integrated integrity and health monitoring, a transparent RS232 autopilot telemetry interface, UTC-synchronized TDD message framing, seamless integration with muLTElink systems, and support for SkyLine Cloud Managed BVLOS Service. It complies with Environmental DO-160G, Software DO-178C Level C, and Complex Hardware DO-254 Level C.
What frequency band does the SkyLink915 operate on, and does it require licensing?
It operates on the ISM band (902-928 MHz) and does not require FCC licensing or FAA transmit approvals, unlike C-Band systems.
What are the technical specifications of the SkyLink915?
Input voltage: 4-36 VDC; Peak power: 1.7 W; Size: 51 x 78 x 33 mm; Weight: 74 grams; Operating temperature: -45 to 70°C; Transmit power: 1 W (4 W EIRP); Receiver sensitivity: -118 dBm; Bandwidth: 200 kHz; User data rate: 4400 Bytes/sec; Timing/Position input: 1 PPS UTC time pulse and NMEA 0183 at 115,200 bps via RS-232.
What regulatory compliances does the SkyLink915 meet?
It complies with FCC 47 CFR Part 15.247 (ID: 2AFFT2XISM). Note: This device has not been authorized by the FCC and may not be offered for sale or lease in the US until authorization is obtained, except for direct sales to the US Government or exports by uAvionix.
What is the warranty for the SkyLink915?
uAvionix products are warranted free from defects in material and workmanship for two year from purchase. uAvionix will repair or replace faulty products at no charge for parts or labor (customer covers transportation costs). Warranty excludes damage from abuse, misuse, water, fire, flood, unauthorized servicing, or modifications.
Is the SkyLink915 compatible with other systems?
Yes, it connects to SkyStation915 and SkyStation915LTE ground radio systems, integrates with muLTElink5060 for multiple links, and supports autopilots like ArduPilot/Mission Planner and PX4/Auterion via RS232. It is part of the SkyLine ARS ecosystem.
What is the difference between SkyLink915 and other SkyLink models like SkyLink5060?
SkyLink915 uses the unlicensed ISM band (902-928 MHz) for easier deployment without licensing, while SkyLink5060 operates on the aviation-protected C-Band (5030-5090 MHz), which requires FCC and FAA approvals but offers protected spectrum for aviation use.
What components are needed to set up a complete SkyLink915 system?
A complete CNPC link requires the SkyLink915 airborne radio, compatible antennas (e.g., ISM Band Dipole), a GPS unit (e.g., truFYX), a ground radio system like SkyStation915POE or SkyStation915LTE, and an autopilot with RS232 telemetry support. SkyLine cloud registration is also required for BVLOS operations.
How do I register the SkyLink915 with SkyLine ARS?
Follow the ARS registration steps in the manual: Access the SkyLine portal, enter the device serial number, configure network settings, and pair with ground stations. Registration enables cloud-managed features like monitoring and roaming.
What ground radio systems (GRS) are compatible with SkyLink915?
Compatible GRS include SkyStation915POE (tower mount) and SkyStation915LTE (portable). These provide ISM band connectivity, with LTE options for hybrid setups.
How do I physically install the SkyLink915 on a UAV?
Mount the unit securely using the provided brackets, ensuring clear line-of-sight for antennas. Connect power (4-36 VDC), RS232 telemetry to the autopilot, and GPS inputs. Avoid proximity to heat sources or interference-prone areas.
How should I install the antennas for SkyLink915?
Install the ISM Band Dipole Antennas (UAV-1004675-004) with at least 20 cm separation for diversity. Ensure vertical orientation and unobstructed views toward the ground station. Use low-loss cables if extensions are needed.
Where should I install the GPS for SkyLink915?
Mount the truFYX EXT GPS externally for optimal sky view. Connect via RS-232 for NMEA position data and 1 PPS for timing.
What are the installation considerations for portable vs. tower-mount GRS with SkyLink915?
For portable (LTE) models like SkyStation915LTE, ensure stable power and cellular connectivity. For tower-mount (POE) like SkyStation915POE, secure on a mast with Ethernet/POE cabling and weatherproofing.
Can I integrate SkyLink915 with existing UAV hardware?
Yes, it integrates via RS232 to the autopilot and supports seamless addition to muLTElink systems for hybrid ISM+LTE links. Ensure voltage compatibility (4-36 VDC) and minimal electromagnetic interference.
How do I configure the autopilot for SkyLink915?
For ArduPilot/Mission Planner: Set serial port to RS232, baud rate to match (e.g., 115,200 bps), and enable telemetry. For PX4/Auterion: Configure UART settings similarly. Detailed steps are in Section 10.7 of the ARS manual.
What configuration is needed for SkyLine cloud integration?
After physical installation, register the device in the SkyLine portal (Section 10.5-10.6), set up network parameters, and configure link preferences (e.g., ISM or hybrid with LTE).
How do I set up link switching or roaming with SkyLink915?
Configuration is handled via SkyLine for ground logic (Section 13 in GRS manual). The system automatically switches links or roams within ISM based on signal quality, with no manual airborne config needed beyond initial registration.
How does the SkyLink915 handle interference in the ISM band?
It uses frequency hopping design to mitigate ISM band interference and provide frequency diversity, ensuring reliable C2 links.
What is the typical range and data rate during operation?
Data rate is 4400 Bytes/sec. Range depends on antenna setup, terrain, and interference but is optimized for BVLOS UAS operations with line-of-sight to ground stations.
How does link switching work with SkyLink915 in hybrid setups?
In ISM+LTE ARS solutions, the system switches between links based on signal integrity (Section 13.1 in GRS manual). Roaming within a link (e.g., between ground stations) is automatic for seamless handover.
What monitoring features are available during operation?
Built-in status, integrity, and health monitoring for both airborne and ground radios, meeting RTCA DO-377A requirements. View via SkyLine cloud dashboard.
Can SkyLink915 operate in multiple environments?
Yes, it supports temperatures from -45 to 70°C and is environmentally qualified to DO-160G Cat B2, suitable for various UAS applications.
What are the recommended checks and maintenance procedures for SkyLink radios?
Regular maintenance includes checking the antenna connections, ensuring the device is free from physical damage, and verifying that the firmware is up to date. Conduct routine tests to ensure the system’s operational reliability, especially in diverse environmental conditions.
What should I do if the SkyLink915 shows no connection to the ground station?
Check antenna connections, power supply (4-36 VDC), GPS signal, and SkyLine registration. Verify line-of-sight and minimal interference. Restart the system and check cloud status.
Why is the data rate lower than expected?
Possible causes: High interference in ISM band, poor antenna alignment, or distance exceeding optimal range.
What if the GPS timing input fails?
Ensure truFYX EXT is properly connected and has satellite lock. Without 1 PPS UTC pulse, TDD framing may degrade; check cables and reposition GPS for better sky view.
What does it mean if the system reports integrity monitoring errors?
This indicates potential hardware faults or signal issues per RTCA DO-377A. Check health logs in SkyLine, inspect connections, and ensure compliance with operational limits (e.g., temperature).
Who do I contact for support?
Contact uAvionix support directly for warranty service, technical issues, or repairs. Provide device serial number, firmware version, and error descriptions.
What are the FAA requirements for operating SkyLink radios, particularly in the C-Band spectrum?
Operation in the C-Band spectrum requires adherence to FAA and FCC regulations, including obtaining the necessary frequency authorizations and ensuring compliance with any regional or national restrictions related to aviation-protected frequencies.
I still have questions. Where do I go for customer support?
For additional customer support, please submit a Support Ticket to the uAvionix customer support team.
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