 LNB hacking
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Conundrum
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Sun Jun 23 2013, 12:34PM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
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Hi all.
Interesting articles re. satellite SETI 
Seems that the third harmonic of the "water hole" at 1420.40575 MHz is very close to a wavelength that most if not all LNBs could be minimally modified to detect.
My proposed modification is a small encapsulated board based on an LM567 that detects the unique frequency of the 440 Hz signal (well known, easy to generate), switches the LNB to the required higher band at a range of 11.320 to 11.380 GHz, overrides the internal limiters and also alternates between H and V polarity at each scan transit.
The dish should work at this wavelength happily and still be compatible with all current systems, as well as being fitted to replace already broken LNBs for not much £.
Also another useful modification would be that the modified LNB could detect Gunnplexers at 10.250 GHz so a lot of amateur radio enthusiasts would like them.
Add to this an optical sensor as that white window is also transparent to near infrared light.
If needed this can be replaced with an infrared passing lens and still not affect the GHz range.
This would be "line of sight" but not a problem due to the weak signal being diffracted by the dish itself.
Comments?
EDIT: Add alpha and gamma sensors, for solar flare and ambient radiation monitoring?
-A
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PSCG
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Registered Member #3792
Joined: Sun Mar 27 2011, 06:07PM
Location:
Posts: 136
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LNB converters have been used before for TX or RX at the 10 GHz band, so it is doable:
Link 1
Link 2
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