2.4 Ghz Services - Channel to Frequency Chart

Occupies part of the 13cm amateur radio band 2400-2450 Mhz with aTV assigned to: 2406-2424 Mhz aTV1 & 2430-2448 Mhz aTV2
2.4 Ghz Services in Mhz - Video - Audio - Data & Telephone devices share this band as do microwave ovens (for cooking / heating water)
Typical distance of most communication gear is ~10 meters to 30 meters (100 feet) - more if using specially designed narrowcast antenna (dish like)
Wireless
Audio Services
"Security TV"
Wireless
Video Services
"Bluetooth"
Headsets
Cordless Phones
IEEE
802.11b = DSSS
802.11g = OFDM
Wireless
Data Services
Microwave Ovens
Cooking Food
Water Absorption
Audio Services
Video Services
 18 Mhz Bandwidth
2.402 - 2.480Ghz
 2.4Ghz Data Ch. 5 Mhz Bandwidth
Centre frequency
50+ Mhz bandwidth
Phones Cordless Audio Channels -- 2402 Mhz
Intercoms Audio Channels -- 2407
wireless headsets Audio Channels 01 2412
wireless speakers 2.4Ghz TV Ch.1 2413 Mhz Audio Channels -- ----
"Bluetooth" Audio Channels 02 2417 Mhz
InfraRed extenders Audio Channels 03 2422
Audio Channels 04 2427
2.4Ghz TV Ch.2 2432 Mhz Audio Channels 05 2432
Audio Channels 06 2437
Audio Channels 07 2442
Audio Channels 08 2447
-- -- ----
2450 Mhz
2.4Ghz TV Ch.3 2452 Mhz Audio Channels 09 2452 Mhz
Audio Channels 10 2457
Data Services Audio Channels 11 2462
Data Loggers Audio Channels 12 2467
WiFi Networks 2.4Ghz TV Ch.4 2472 Mhz Audio Channels 13 2472
Audio Channels -- 2477
Audio Channels -- 2482
Data Channel
 14 2484
out of band / guard band -- 2487 - 2497 Mhz
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Terms:
DSSS = Direct Sequence Spread Spectrum - OFDM = Orthogonal Frequency Division Multplexing
"Bluetooth" also uses this frequency, hoping many 1000's times a second.
"Frequency Hoping" Allows more people to use this narrow part of the radio frequency spectrum by changing channels rapidly in predefined sequences.
Thus allowing the "electronic smarts" to easily recover the audio / video / data information from what sounds like a hash of noise.
Older video / audio systems show this noise as pulsating line interference or strong varying audio hiss. 2.4Ghz is considered a poor long distance (10's of km) terrestrial communication frequency due to the physics of water (vapor) absorption.
As microwave ovens operate at 1000's of watts in this band to exploit water absorption characteristics to heat food.interference is very high
Also many short range (1m to 2Km) communication devices now use this frequency, this band is very crowded.
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"vk3khb.gak.net.au/atv/2.4Ghz_list.html" was last updated on 2008DecThu18_15:23 : viewed on _JanWed07_08:58 by 38.103.63.60 visitor #154 since 2008_July_1