Value chain · CLM-0991
In plain terms
In 1978 the frequency band the satellite was to use was an industrial free-for-all band in the West, where users must put up with each other's interference, but the Eastern bloc had its equivalent band shifted 75 MHz lower, so the satellite's frequency was not inside it there.
The claim as recorded
The 2400-2500 MHz industrial, scientific and medical band the SPS power beam sits in was not recognised uniformly in 1978: Arndt and Leopold state that Albania, Bulgaria, Hungary, Poland, Romania, Czechoslovakia and the USSR "reserve 2375 MHz +/- 50 MHz for the IMS band", so the SPS fundamental at 2450 MHz fell outside the ISM allocation over those countries, and that "by definition anyone operating in an IMS band must accept interference from any other user within this band".
Evidence behind this: T3-proceedings reprinting a 1978 conference paper; a statement of allocations as of 1978.
Scope and limits
AS OF 1978; the ITU Radio Regulations have been revised many times since and the Region 1 ISM allocation today is 2400-2500 MHz (footnote 5.150), so this is history, not the present position. The paper calls the band "IMS"; the current term is ISM.
What it assumes
No assumptions are recorded against this claim.
Where it comes from
PDF p.241, normalised (the page prints "nonGovernment" and "Rommania", and a typewriter plus-or-minus whose bar falls on the next line): "The SPS downlink power beam lies in the 2400-2500 MHz frequency band which has been reserved for Government and non-Government industrial, medical, and scientific (IMS) usage. By definition anyone operating in an IMS band must accept interference from any other user within this band. However, this 100 MHz band is not recognized by some of the European countries, including Albania, Bulgaria, Hungary, Poland, Romania, Czechoslovakia, and the USSR." "These countries reserve 2375 MHz +/- 50 MHz for the IMS band."
Basis: MHz band edges by administration
Related records
- Answers question
- QST-001 not published in this release
Cite this
energyaperture.com/c/clm-0991
CLM-0991, Energy Aperture, as of 1978.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-516
- CLM-0988The rule that radio astronomers hold the satellite to is a specific international report, and its limit near the satellite's frequency is...CLM-0989The same figure, minus 160, appears in two 1970s papers meaning two different things: in one it is the noise reaching the ground, in the...CLM-0990The extra twenty decibels of noise suppression for a fleet assumes a hundred satellites. The government's reference plan was sixty, which...CLM-0992The receiving field on the ground makes its own harmonics: the diodes that turn microwaves into electricity also generate signals at two...CLM-1091The people running the programme said 2.45 GHz was sensible and also said, in the same breath, that nobody international had agreed to it...CLM-1222The fourth paper the 1978 design cites for its beam limit also calls the limit a theory that had not been tested. The one experiment it...