Some photographs of the phasing interferometry radio telescope (146 MHz)
The 146 MHz radiotelescope.
In front the astro rover, which contains the mobile antenna.
In front the fixed antenna.
The antennas are 3 element beams for 146 MHz.
Again the fixed antenna.
The Astro Rover. This is the mobile antenna, which i
What you see inside the fieldbox ( and my feet)
From left to right: 2 times 10 dB 146 MHz amplifiers,
the 146 MHz to 31 MHz frequency convertors, the 2 times
19 db 31 MHz amplifer and the 13.6 Volt power supply
An extra piece of coax cable to correct some phase error
The 1 time 10 dB 146 MHz amplifier
The 2 times 19 dB 31 MHz amplifier
The 2 times 146 MHz to 31 MHz frequency convertors
You see left the AVR microprocessor which programs
the si570 local oscillator, above it the 2 powerregulators
for the 5 volt for the microprocessor and the 3 Volt
for the si570.
At the right the 2 convertors.
top is 146 MHz input and at the lower part the 31 MHz output.
I build them as coherent as possible without using
the modern SMD technique.
The convertors in more detail
If anybody want some more information, please send me a mail.
The 146 MHz radiotelescope in test phase
In some more detail
Left and Right are the two beam antennas
In the middel the fieldbox with a lot of electronics in it.
From this fieldbox go 2 coaxial cables of 80 meter length to the
caravan in which are the receivers and the computer
The frontend , the dipole antenna and a beam-reflector
Please don't laugh... it is working!
In the plastic is the antenna amplifier ( noise figure
is 0.2 db and amplification = 28 db) and a 10 db broadband