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2.4 Ghz Services - Channel to Frequency Chart


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2.4 to 2.4835 Ghz services occupy large part of the 12cm amateur radio band 2400-2450 Mhz
aTV1 assigned to: 2406-2424 Mhz (2415 -/+9Mhz bw for AM or FM) &
aTV2 assigned to: 2430-2448 Mhz (2439 +/-9Mhz bw for AM or FM)

2.4 Ghz services Video - Audio - Data and Telephone devices as well as domestic and commercial ovens (for cooking / heating water) at 2450Mhz +/-50Mhz

Typical TX power levels 1mW to 10mW (max) for domestic equipment, licensed amateurs allowed much more. Typical distance of most domestic communication gear is ~10 meters to 100 meters (300feet) more if using narrowcast antenna (dish like objects on poles).

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Wireless
Audio
Services
Security
TV
Wireless
Video
Services
"Bluetooth"
Headsets
Cordless
Phones
IEEE
802.11b
=DSSS
802.11g
=OFDM
Wireless
Data
Services
Amateur
Radio
and
TV
Audio
Services
Video
Services
18 Mhz
Bandwidth
2.402 -
2.480Ghz
2.4Ghz
Data.Ch.
5 Mhz
Bandwidth
2400 Mhz
to
Phones
Cordless
. . Audio
Channels
-- 2402 Mhz 2403 Mhz
satellites
Intercoms . . Audio
Channels
-- 2407 2406
CW & SSB
wireless
headsets
. . Audio
Channels
01 2412 2406 Mhz
aTV1
wireless
speakers
2.4Ghz
TV Ch.1
2413 Mhz Audio
Channels
-- ---- aTV1
"Bluetooth" . . Audio
Channels
02 2417 Mhz aTV1
InfraRed
extenders
. . Audio
Channels
03 2422 aTV1
2424 Mhz
. . . Audio
Channels
04 2427 2425 Mhz
fm sstv rtty
. 2.4Ghz
TV Ch.2
2432 Mhz Audio
Channels
05 2432 2430 Mhz
aTV2
. . . Audio
Channels
06 2437 aTV2
. . . Audio
Channels
07 2442 aTV2
. . . Audio
Channels
08 2447 aTV2
2448 Mhz
microwave
oven

2450 Mhz

+/- 50Mhz
bandwidth
. 2.4Ghz
TV Ch.3
2452 Mhz Audio
Channels
09 2452 Mhz fm links to
2450 Mhz
. . . Audio
Channels
10 2457 public
park
Data
Services
. . Audio
Channels
11 2462 public
park
Data
Loggers
. . Audio
Channels
12 2467 public
park
WiFi
Networks
2.4Ghz
TV Ch.4
2472 Mhz Audio
Channels
13 2472 public
park
. . . Audio
Channels
-- 2477 public
park
. . . Audio
Channels
-- 2482 public
park
. . . Data
Channel
14 2484 public
park
. . . Out of band
/ guard band
-- 2487 - 2497
Mhz
.



Terms:
DSSS = Direct Sequence Spread Spectrum
OFDM = Orthogonal Frequency Division Multiplexing
"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 (vapour) absorption. Also as microwave ovens exploit this feature and operate at 1000's of Watts inside a metal box to heat food the noise in the band can be quite high. As more short range devices (1 to 250 meters) use this band, the interference level will become very high, to counter act this interference different modulation techniques and frequency hopping algorithms are used. Transmitter output power levels for each set of devices may add to the reception problems of other non-linking devices but with encoded signals turned on, polarised antenna (oriented horizontal or vertical) or physical separation of devices, operation and security from other users can be achieved. The other "public license" bands / frequencies that have similar uses for voice (phone) video (security) data (internet) are 900Mhz, 1.8Ghz, 5.8Ghz. Some of these bands are also used for mobile / cell phones, hence the ease of "Bluetooth" or wireless functionality with your other communication / multi-media devices.

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