What can be used for HRPT
The first and the most importent component of the system is the antenna, so before you start the solder iron, decide what antenna you will use. If you can use a big parabolic antenne from 120 cm and up, you can make nearly anything work.
However a big antenne demand a heavy elevation rotor system, and for my own part would a 100 cm (or bigger)parabolic antenna, come under Copenhagens city planning office, so i would have to get a building permission before i could put it on the roof.
My aim was to use a small antenne, that could be rotated by a small elevations rotor system, and could be used without building permission.
I have don my testing, by making differnt construktions and see how they work.
The data on the homemade parts i have used, comes from a testbench on the Danish electronic engeniering college, so the result could be used in a spreadshet and in that way
,i could compaire my homemade with other HRPT systems.
This will work.
The NOAA 95 project's modem, with 120 cm parabolic antenna, and the NOAA 95 HRPT project reciever
The pictueres below, show the system that i use, and are made by the Duch group "kunst manen".
Click here for the reciever construktions homepage
Click here for the modem construktions homepage
The modem and the reciever can work with.
A 65 cm parabolic antenna, with a helix feed and a pre. amp. 0.4 db NF 35 db gain.and converter from ORBIT.
The 2 X 36 elm. beam, with brass combiner with a NF at 0.2 db, (0.7 db )
pre. amp. 35 db,
0.62 db NF, converter from UWK bericte (1984).
PS: on the recievers homepage, there is a 150 cm long HELIX antenna, that would work to.
Back to English page