RF section Control section Output Section Df Df Df CPU Hybrid LC GPS Control section 915MHz 10dBm CPU TI CC1101E Transceiver Hybrid Mixer HMC 1056 LO HMC765 7 GHz 10dBm LC Interface board 8 GHz 6dBm DAC Df DAC DAC Df splitter Df 8 GHz 0dBm Kuhne Amplifier PA600770-2 CPU Tegra TK1 12V 1A USRP Ettus B210 USB powered LO HMC765 7-9 GHz 15V, 5.5V DAC MCP4725 3.3V DAC buffer RF Switches Peregrine PE42441 3.3V, TTL RF Power Amp Kuhne KUPA600770-2 2A (x3) Output Section 3-way splitter PE42441 3-way splitter PE42441 3-way splitter PE42441 8 GHz 30dBm Antenna 1 Antenna 2 Antenna 3 Total ~ 100W

RF section Control section CPU Pointing Control Total ~ 100W GPS Control section 915MHz -100 dBm CPU TI CC1101E Transceiver Mixer WJ-12 LO HMC765 High Gain Antenna 7 GHz 10dBm Digital Recorder Low Gain Antenna Pointing Control CPU Tegra TK1 12V 1A Digital Recorder Ettus B210 USB powered LO HMC765 7-9 GHz 15V, 5.5V DAC MCP4725 5V DAC buffer RF Switches RLC SR-2-MININ 12V, TTL 120mA (x6) RF Power Amp Kuhne KUPA600770-2 2A (x3) Total ~ 100W

Flight computer NVIDIA Tegra TK1 ARM processor 12V DC USB3.0 for SDR USB2.0 for webcam Digital IO and RS232 SPI bus for LO I2C bus for DAC IO for RF switches 13 x 13 x 4 cm Status In lab, software mostly in progress

General interface board Multiplexes and Interfaces peripherals to flight computer 8-output digital IO (4 reserved) 4-input temp AD590 temp sense (or general +/- 2.5V 16-bit A/D) 0-12V 12-bit DAC output (3 reserved for phase shifters) GPS w/ external antenna SPI bus outputs for synthesizer On-board I2C bus TI CC1100e 950 MHz radio Txcvr Freescale K20-family microcontroller

Flight Power Supplies Four board models TI Power Modules Out Voltage Range (3-12V or 12-15V) Out Current Range (0.5-1.5A or 3-6A) TI Power Modules PTN78000W/H PTN78020W/H PTN78060W/H Input Range 18-36V Input/Output Filtering capacitors Electrolytic, Tantalum, Multilayer Ceramic Status PCB boards arrived Parts ordered, to arrive 5/10

Software Defined Radio Universal Software Radio Peripheral USB Bus powered Radio Transceiver chip with FPGA to decimate baseband signal to fit over USB pipe Software design GMSK / QPSK modem to modulate signal Status Link working, not up to adequate speed Fall-back position of TI transceiver chip (CC1100) and microcontroller currently working at 100 kbps

RF Hardware Local Oscillator Synthesizer Hittite HMC766 Eval board +10dBm 7-8 GHz tunable Integer/Fractional VCO/PLL +15V, +5.5V 3-Way splitter to feed triple-monopole line feed SP4T switch to feed three antenna designs Status LOs ordered and arrived (x2) 3-way splitters exist SP4T switches (two options identified and in stock)

Mechanical and Heat dissipation In design stage CAD sent out to shop All electronics parts exist in lab and are being coded / tested. Currently at 7.5 lb. 30 cm Power supplies Heat strap 20 cm 10 cm CPU & Interface board 8 GHz power amplifiers and RF switches

Breadboard for lab test DCDC converters Interface board Power amplifiers Flight computer RF splitter and phase shifters

Optional RF re-packaging for cubesat volume Duroid 4350 / FR-4 Trade Section Length Duroid Loss FR4 Loss Part Loss 1 (950 MHz) 90° hybrid + mixer 1.3 in 0.11 dB 0.18 dB 2 (7700 MHz) splitter + phase shift 0.7 in 0.20 dB 0.50 dB 1.5 + 4 dB 3 (7700 MHz) Antenna switch 1.0 in 0.28 dB 0.71 dB 1.2 dB Total loss 0.59 dB 1.39 dB 3 Notes: Section 3 is the only one after the power amplifiers. Board layout is conceptual for trades – would be decreased in size and integrated with interface board for cubesat. 2 1

Df Df Df radio Hybrid LO IF2 LO IF1 RF splitter 950MHz +10 dBm 7.3-8.2 GHz +15 dBm IF2 radio Hybrid mixer LO IF1 LO -8dB -3dB RF 7.7 GHz -1 dBm 7.7 GHz -5.8 dBm Df Df splitter Df -4dB 7.7 GHz -10 dBm

21.5mm (0.847”) 11.627mm (0.458”) 18.4mm (0.724”) 2.0mm (0.080”) (0.050”) 17.75mm (0.700”)