Tethers Unlimited Delivers SWIFT K-Band CubeSat Transmitter

SWIFT K-Band CubeSat transmitter (Credit; Tethers Unlimited)

BOTHELL, Wash. (Tethers Unlimited PR) — Tethers Unlimited, Inc. (TUI) announced that it has successfully delivered the first flight unit of its new K-Band transmitter for small satellites to a confidential customer.

Developed under a Small Business Innovation Research contract from the US Army’s Space and Missile Defense Command, the SWIFT®-KTX transmitter builds upon TUI’s high-maturity SWIFT software defined radio platform to enable satellites as small as a loaf of bread to transmit data at rates exceeding 100 megabits per second (Mbps).

Capabilities

SWIFT-KTX provides small satellites with a high-throughput downlink in K-band. When paired with the next generation SWIFT baseband processor and sufficient link margin, real data rates of 500 Mbps or more are achievable using high order modulation (>3 bits/Hz) and Turbo/LDPC encoding.

Two transmitter front-end modules are currently in development. Each module includes a two 2W PAs that directly drive two switchable WR-42 waveguide interfaces for left/right antenna polarization agility. A third ≈10 dBm waveguide output is available before the PAs for driving TWTAs and integrated K-band ESAs.

  • >500 MHz real modulation bandwidth
  • Two discrete designs covering approximately:
    • 18-23 GHz
    • 23-28 GHz
  • ≈ 3 dBm saturated output power w/ ≈20 dB adjustable range
  • Three switchable WR-42 waveguide outputs (two w/ HPAs)

Target Specifications

  • >3 year LEO mission design life
  • 1/3U or smaller: 86×86 x < 40mm
  • < 500 grams
  • 6-36V unregulated DC
    • Integrated latch-up/fault detection and protection
  • Flexible mounting options
    • Flanges for deck mounting
    • Ears for CubeSat rail mounting
  • Power consumption:
    • Current generation 50 MHz baseband processor: ≈3W
    • Next generation 500 MHz baseband processor: ≈15W
    • K/Ka-band module power consumption for 33 dBm output: ≈16W
  • High-speed interface options:
    • 1Gbit Ethernet
    • 200 Mbps SpaceWire (LVDS)
    • 200 Mbps sync. HDLC over LVDS
    • 10+Gbps SERDES (next generation baseband processor only)

  • Robert G. Oler

    looking at the power etc specs a very impressive achievement…and so will be the ground station that puts together that data flow with I am guessing a medium or so gain antenna on a cubesat

    well done.

  • Michael Halpern

    When I saw the image before looking at the specs i thought it would be 10cm x 10cm, getting a decent low power transmitter without even a tight beam system in such a size is impressive, small frequency range sure, but it’s still impressive.