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Technical Documentation of 50cm 300-900 MHz (P500)

TypeHEMT LNA, unclooled
RF Frequency Range300-900 MHz
Band Width RF Filters wide band300 - 505 MHz
608 - 685 MHz
790 - 915 MHz, all parallel
Band Width RF Filter 400 MHz band401 - 405 MHz
Band Width RF Filter 600 MHz band608 - 614 MHz
1. Local OscillatorULO1 = 1250-1850 MHz
1. IF2100 - 2200 MHz
2. Local OscillatorULO2 = 1400MHz fixed
2. IF500 - 1000 MHz
PolarizationLHC and RHC
CalibrationNoise Diode
Feed11-Feed from DRAO
Output300 - 900 MHz direct or 500 - 1000 MHz with IF converter

Block Diagram


IF Converter


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.
electronics/rx/techinfo/documentation_p500mm.txt · Last modified: 2022/05/10 14:14 by rkeller