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Technical Documentation of 50cm 300-900 MHz (P500)
Type | HEMT LNA, unclooled |
Channel | 2 |
Tsys | 300K(Trec~150K |
RF Frequency Range | 300-900 MHz |
Band Width RF Filter | 300 - 505 MHz |
→ | 608 - 685 MHz |
→ | 790 - 915 MHz) |
1. Local Oscillator | ULO1 = 1250-1850 MHz |
1. IF | 2100 - 2200 MHz |
2. Local Oscillator | ULO2 = 2000MHz fixed |
2. IF | 100 - 200 MHz |
Polarization | LHC and RHC |
Calibration | Noise Diode |
Feed | 11-Feed from DRAO |
Output | 300 - 900 MHz |
Comments
This receiver is a straight forward 300 MHz to 900 MHz receiver with no down conversion. Due to intensive RFI in this broad frequency band three filter bands are installed in the main part to prevent the system from saturation by the strongest interferer. Nevertheless, there is much more RFI in the band that has to be filtered in the backend. For dedicated projects, switchable RF filters plus LNAs have been inserted for frequencies around 402 MHz and 611 MHz. The filters have a bandwidth of 7 to 10 MHz. For continuum measurements an analogue filtering down converter module to an IF of 100 MHz to 200 MHz for both channels is available.