Highest frequency
- Thread starter Sudyal
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fineshot1
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Why re-invent the wheel - Click on the links below. Hopefully you have adobe reader.
http://www.ntia.doc.gov/osmhome/allochrt.pdf
http://www.ntia.doc.gov/osmhome/Chp04Chart.pdf
http://www.adec.edu/tag/spectrum.html
There wouldn't be any point in going higher. There isn't much of interest to listen to that the casual listener could find above 1300 MHz. That's not to say there are no signals there... there are. But the skill level required to detect them, let alone demodulate them is not trivial. That's why most scanners that go up that high stop at 1300. The wide band receivers that go even higher? A waste of money in my opinion...
The lowest electromagnetic frequenciy would be DC current at about .00001 KHz. I think the sun's electromagnetic freqency can ran up to 50000 GHz during a large solar flare. That's why some receivers are called "DC to Daylight". The highest frequency on any consumer grade receiver I've seen in 3000 GHz. You can hear about as much radio traffic there as listening to your shoe. 
kd7rto
Member
Above the 1240-1300 MHz amateur band, the only voice traffic which can be demodulated are from experimenters like this guy: http://ka7oei.com/
A sweep of the 1850-1990 PCS band with a spectrum analyzer will tell you which service providers put a strong signal into your location, which are weak and would not be a good choice if you are in the market for a new cell phone, and how many 1.25 MHz wide carriers that a CDMA provider is operating. Very few would find this information worth the cost of the equipment.
In the 2.4-2.5 GHz ISM band you will find wireless LANs, wireless surveillance cameras, and cordless phones using unmonitorable digital modulation techniques. Amateur radio licenses have privileges in this band, and in some areas it is used for ATV. The Optoelectronics Video Sweeper looks like a neat toy to explore these video sources. Some people (with a lot of time on their hands) attempt to map wireless LANs, a google search for the term “wardriving” should provide all the details. Finally, there is a PCMCIA card (with a DOS program) which functions as a cheap spectrum analyzer for 2.4-2.5 GHz. I haven’t looked recently, but a few years ago they were found in abundance on Ebay.
A sweep of the 1850-1990 PCS band with a spectrum analyzer will tell you which service providers put a strong signal into your location, which are weak and would not be a good choice if you are in the market for a new cell phone, and how many 1.25 MHz wide carriers that a CDMA provider is operating. Very few would find this information worth the cost of the equipment.
In the 2.4-2.5 GHz ISM band you will find wireless LANs, wireless surveillance cameras, and cordless phones using unmonitorable digital modulation techniques. Amateur radio licenses have privileges in this band, and in some areas it is used for ATV. The Optoelectronics Video Sweeper looks like a neat toy to explore these video sources. Some people (with a lot of time on their hands) attempt to map wireless LANs, a google search for the term “wardriving” should provide all the details. Finally, there is a PCMCIA card (with a DOS program) which functions as a cheap spectrum analyzer for 2.4-2.5 GHz. I haven’t looked recently, but a few years ago they were found in abundance on Ebay.
n1das
Member
There is also some 10GHz "X band" and 24GHz "K band" amateur radio activity on these bands, shared with radiolocation service licensees, aka RADAR. My radar detector in my car never misses door openers operating in the 10 GHz band.
There are also plenty of point to point microwave links operating in the GHz range.
There are also plenty of point to point microwave links operating in the GHz range.
n1das
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