145.800 MHz

433.500 MHz

N/A

N/A

Massachusetts Institute of

Technology

N/A
 

14.5 kHz, 25.5 kHz,

36 kHz, and 47 kHz

Downlink only.

Bluetooth

Bluetooth

RF Only between team's two BalloonSats

N/A

437.450 MHz

No longer using RF (06/14/12)

2.4000GHz and 2.4835GHz

2.4000 GHz and 2.4835 GHz

Using RF but frequencies unknown.

145.890 Mhz

435.150 Mhz

437.000 Mhz

435.900 MHz

Using a half-duplex system.

Guidelines on RF requirements for SHOT II payloads taken from SHOT II User's Guide, page 10.

> The following frequencies are off-limits during all launch and recovery day activities: 144.340 MHz (±15 kHz), 147.555 MHz (±15 kHz) and 445.975 MHz (±100 kHz).

> The following frequencies are available and clear of interference in launch and recovery area: 145.600 MHz and 446.050 MHz. There are likely to be many other usable frequencies in the area but EOSS has not yet confirmed them to be interference-free.

> Each transmitter must be controlled by a licensed ham operator and identified per Part 97 of the FCC Rules.

> Effective Isotropic Radiated Power (EIRP) must be no more than 0.4W (26 dBm).

> Each transmitter must be capable of being shut down in flight in the event of interference with essential EOSS channels or other users.

> There should be no problem if teams wish to use Part 15 devices, or ham bands other than 2m and 70 cm, e.g. 29, 50, 220, 905 MHz or higher bands, although the EIRP should be no more than 30 dBm (1W) to avoid possible de-sense to balloon receivers. This should be more than enough to maintain a narrow-band link out past 100 miles down to below 20,000 ft in descent but the Part 15 (e.g. WiFi) devices may not work beyond 20 or 30 miles even with gain antennas on the ground. Experiments using communications links to the ground should notify COSGC as soon as possible during the design phase, so that placement of the payload in the balloon string can be coordinated.