Mirrors
/
ARDEN-documentation
mirror of https://github.com/aredn/documentation.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Replace Channel Width Example 

Replace the channel width example graphic in preparation for removing 
references to the 9cm band.

Also correct the number of channels in 5cm band.
This commit is contained in:
Steve AB7PA 2020-10-25 12:38:18 -07:00 committed by GitHub
parent 6e52822f7b
commit b4ba4e93f2
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
arednNetworkDesign/_images/channel-width-example.png
View File

Binary file not shown.
Side by Side Swipe Overlay

Before

Width:  |  Height:  |  Size: 54 KiB

After

Width:  |  Height:  |  Size: 70 KiB

6
arednNetworkDesign/frequency_bands.rst
View File

@ -18,7 +18,7 @@ Band Frequency Range Total Bandwidth Channels
33 cm 902-928 MHz 25 MHz 4
13 cm 2390-2450 MHz 45 MHz 9
9 cm 3300-3500 MHz 120 MHz 24
5 cm 5650-5925 MHz 260 MHz 52
5 cm 5650-5925 MHz 260 MHz 54
======= ================= =============== ========
The table above shows that the 9 cm band has the most available bandwidth in its unshared channels, while the 5 cm band has the next largest amount of available bandwidth in unshared channels. The choice of a frequency band for AREDN |trade| networking depends on several different factors, but you can "mix and match" bands in your network design as long as both sides of a radio link use the same band, channel, and channel width.
@ -85,9 +85,9 @@ Disadvantages
:align: center
Advantages
One advantage for using the 5 cm band is that it contains 52 channels, and many of them at the upper end of the band are under-utilized with less chance of interference. You can choose channel widths of 5, 10, or 20 MHz, with larger channel widths providing higher data rates. Remember that reducing the channel width will increase the :abbr:`SNR (Signal to Noise Ratio)` to improve signal quality if that is an issue for a problem link.
One advantage for using the 5 cm band is that it contains 54 channels, and many of them at the upper end of the band are under-utilized with less chance of interference. You can choose channel widths of 5, 10, or 20 MHz, with larger channel widths providing higher data rates. Remember that reducing the channel width will increase the :abbr:`SNR (Signal to Noise Ratio)` to improve signal quality if that is an issue for a problem link.
The radio equipment and antenna systems for this band are readily available and are less expensive due to greater consumer demand. There is a wide variety of equipment from several manufacturers which supports the AREDN |trade| firmware and operates across the 52 available channels. Radio and antenna systems for this band which are similar in size to those for other bands will often have higher gain. Devices in the 5 cm band are also well-suited for *Backbone Links* since there is little chance for RF interference from other radios sharing these frequencies at high profile sites. With clear line of sight and well-tuned antennas, 5.8 GHz signals can propagate across very long distances.
The radio equipment and antenna systems for this band are readily available and are less expensive due to greater consumer demand. There is a wide variety of equipment from several manufacturers which supports the AREDN |trade| firmware and operates across the 54 available channels. Radio and antenna systems for this band which are similar in size to those for other bands will often have higher gain. Devices in the 5 cm band are also well-suited for *Backbone Links* since there is little chance for RF interference from other radios sharing these frequencies at high profile sites. With clear line of sight and well-tuned antennas, 5.8 GHz signals can propagate across very long distances.
----------