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That Miraculous Device: Onboard Radio
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Domagoj Offline
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Post: #31
RE: That Miraculous Device: Onboard Radio
That is a very good news. I never realized such a system, open for public, even existed.
01-23-2016 04:54 AM
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Exploro Offline
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Post: #32
RE: That Miraculous Device: Onboard Radio
Some notes on band S, Ka, and Ku bands.

S-band

Amateur allocation for radio/ satellite is 9 cm and 13 cm bands.

9 cm band

SHF; regions 1 and 2 the 9 Cm band is between 3,300 and 3,500 MHz for radio. The satellite band is between 3,400 and 3,410 MHz. Available on "secondary" basis.

13 cm band

Portion of the UHF spectrum allocated to amateur radio/ satellite use on "secondary" basis. 13 cm band between 2,300 and 2,450 MHz for radio and 2,400 and 2,450 MHz for satellite

Allocations are universal through all regions! All stations above 2.4 GHz must accept harmful interferebce from industrial, scientific, and medical equipment operating in this band

IN the US (part of Region 2) 13 cm band is in two segments
#1: 2.3 to 2.31 GHz
#2: 2.39 to 2.45 GHz

Operating Requirements: All licensees hold Technician class license or higher in the US.

Ka Band

26.5-40 GHz, wavelengths between 1.1 and 7.5 cm

20-30 GHz used for Satellite communications. Uplink is either 27.5 and 31 GHz. Downlink uses between 18.3 and 19.7 GHz or between 19.7 and 20.2 GHz.

Ka allows high bandwidth for communications.

Ku Band

Spectrum between 12 and 18 GHz' Ku refers to "Under" K band. Wavelengths are between 1.67 and 2.5 cm

Typical band used for TDRS

Region 2 bands are from 11.7 to 12.2 GHz for LOF. 10.75 to 11.25 for Fixed Satellite Service. Satellite uplink is 14.0 to 14.5 GHz.

Both Ka and Ku bands suffer from interference due to rain. Amateur allocations for bands between Ka and Ku are 1.2, 3 and 5 cm wavelengths
(This post was last modified: 02-22-2016 04:59 AM by Exploro.)
02-22-2016 04:58 AM
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NERVAfan Offline
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Post: #33
RE: That Miraculous Device: Onboard Radio
(02-22-2016 04:58 AM)Exploro Wrote:  S-band
[...]

Operating Requirements: All licensees hold Technician class license or higher in the US.

So one of us would have to get a license if we did this...

Technician class is the basic one, and IIRC it's not that hard - I used to have one but it expired and I've forgotten nearly 100% of it.

Quote:Ku Band

Spectrum between 12 and 18 GHz' Ku refers to "Under" K band. Wavelengths are between 1.67 and 2.5 cm

Typical band used for TDRS

So this is what the ISS TDRS uses?
03-11-2016 03:39 AM
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Exploro Offline
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Post: #34
RE: That Miraculous Device: Onboard Radio
(03-11-2016 03:39 AM)NERVAfan Wrote:  So this is what the ISS TDRS uses?

According to the wiki article on the station S-band and Ku-band systems are used for communication. S-band is used for audio communications only. Ku-band radios are used for audio, video, and telemetry.
(This post was last modified: 03-14-2016 07:29 AM by Exploro.)
03-14-2016 07:25 AM
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