1 DCS MANUFACTURERS MEETING NOVEMBER 9, 2006 Peter Woolner Mitretek Systems /300 Auto Detect

2 Satellite load of 100 channels at ~48 dBmi Desired channel at its minimum EIRP of 47 dBmi Two adjacent channels at the average uplink EIRP of 48 dBmi, one at the minimum allowed frequency separation Both adjacent channels have worst case sideband power distribution Interference Assessment

3 Calculation Steps Calculate worst case frequency separation Integrate sideband power in the desired signal’s noise bandwidth Add this interference to the thermal noise Calculate C/N0 reduction (< 1 dB) Calculate remaining margin (~0.3 dB)

4 Results 300 bps links cannot harm 100 bps links 100 bps links might exceed the parameter levels that could harm a 300 bps link but I believe this is very unlikely If needed, adjacent channels can now be checked for their relative performance Wallops reception would still have ~6 dB margin

5 Conclusions There is no RF reason to prevent any DCPR channel being used at 100 bps and 300 bps signals intermixed in any ratio The demodulators must be able to identify each signal correctly Is a change needed to the DAPS?