WebSDR station description
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2m antenna: The antenna used when 2m is connected is a russian surplus VHF turnstile at 85 meters above sea level. A pre-amp is directly mounted beneath the antenna. In front of the turnstile is a 70cm eggbeater for use at the Delfi-C3 groundstation. |
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70cm antenna: The antenna used when 70cm is connected is one of the Delfi-C3 tracking antennas. |
VLF antenna: The antenna used for VLF reception is an active antenna designed by prof. Nordholt at the TU-Delft. More about this antenna can be found in an article from Dick Rollema PA0SE. This antenna is directly connected to the sound card. | |
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The local oscillator for the receiver consists of a marconi instruments RF generator for now. I plan to replace it with a fixed crystal oscillator. |
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The receiver designed and constructed by Wouter Jan Ubbels, PE4WJ. It is a Direct Conversion (DC) receiver containing two mixers. one for In-Phase and one for Quadrature mixing. The 90 degrees phase shift is accomplished by using a coaxial transmission line hybrid. The output of both mixers is amplified and sent to the sound card sampling at 192kHz. |
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The internals of the receiver, including 90 degrees phase shift coaxial line and the actual receiver inside the metal can. |
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The computer whichs processes it al... |
Last modification on: 23 Feb 2016. File: pa3weg/websdr_station_description.php