VUSat

In February 2005 the rendering of the first Indian amateur radio microsatellite by the PSLV carrier device is being prepared (Polar Satellite Launch Vehicle) from Sriharikota.

This satellite will be approximately cubic in shape (630 x 630 x 550 mm) and will weigh 40 kilograms. There are solar panels on four walls, there are antennas on the top and the lower part is used to attach to the shuttle.

An elliptical orbit with a height of approx 817 several hours of band opening is rare. One trip will take approx 116 minutes, and under ideal conditions it will be within range of the earth station for ten to twelve minutes.
There are two linear transponders on board: Indian and Dutch. Both are designed to work in B mode with uplink on UHF and downlink on VHF (U – In operation). Their bandwidth is 60 kHz and thus enable CW, SSB and FM communication. Output power is approx 30 dBm (1W).

The requirements for the equipment of the earth station are quite high. For example, it will be necessary for work:
1, UHF uplink (435,250 MHz)

• HF power: 40 dBm (10W)
• As a result, SWR begins to rise again due to an increase in impedance mismatch: 12 to 18 dBi
• EIRP pri max. antenna gain: 56 dBm

2, VHF downlink (145,900 MHz)

• As a result, SWR begins to rise again due to an increase in impedance mismatch: 16 dBi
• Carrier frequency level at the RX input: -107 dBm (1uV)

Transponders will be distinguishable by beacons, The VU part will be broadcast on 145,940 MHz unmodulated carrier, The PA part will transmit a modulated signal to 145, 860 MHz.