Difference between revisions of "Wireless"

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(Fresnel Zone)
(Signal-to-Noise)
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=Signal-to-Noise=
 
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*http://en.wikipedia.org/wiki/Signal-to-noise_ratio
 
Signal-to-noise ratio (often abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise. It is defined as the ratio of signal power to the noise power, often expressed in decibels. A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise.
 
Signal-to-noise ratio (often abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise. It is defined as the ratio of signal power to the noise power, often expressed in decibels. A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise.

Revision as of 18:50, 20 March 2014

Long Range Other

Bridge Solution

Decision

To be added later.

Hardware and Stuff

http://www.ubnt.com/

Notes

MCS15 (130mbps?) = see 'my post'

  • Don't forget to turn off AirMax and use a 20 MHz channel width, or your campers won't be able to associate to the AP.

MCS stands for Modulation and Coding Scheme. The 802.11n standard defines a total of 77 MCS. Each MCS is a combination of a certain modulation (e.g., BPSK, QPSK, 64-QAM), coding rate (e.g., 1/2, 3/4), guard interval (800 or 400 ns), and number of spatial streams. Support for MCS 0-15 is mandatory for 802.11n APs and support for MCS 0-7 is mandatory for 802.11n clients.

Calculating Signal

Cable

  • Microcom...PRO - $189, CARRIER - $249
  • Streakwave...PRO - $145, CARRIER - $185
  • Amazon and eBay...Shireen DC 1021 (similar to PRO cable) - $155
  • Both PRO and CARRIER GRADE are rated for CAT 5E up 1 Gbps
    • PRO has only foil shielding
    • CARRIER has foil and wire mesh shielding, and a plastic anit- crosstalk divider.

My Post

Wifi

  • 2x 19db panel antennas
  • 2x waterproof enclosures
  • 2x wrt54gl (250mw)
  • 2x POE injectors

Notes

Connectors for Dish

  • Antenna Female N
  • Cable Male N to Female N
  • USB Wireless Card antenna connector Outside Threads Male pin Inside
  • Antenna of wireless card femal in and threads in.

Fresnel Zone

  • http://en.wikipedia.org/wiki/Fresnel_zone
    • 3 zones, 1st zone center, then 2nd, then 3rd, etc.
    • Waves that reflect off of surfaces within an even Fresnel zone are out of phase with the direct-path wave and reduce the power of the received signal. Waves that reflect off of surfaces within an odd Fresnel zone are in phase with the direct-path wave and can enhance the power of the received signal.
  • http://www.zytrax.com/tech/wireless/fresnel.htm

Signal-to-Noise

Signal-to-noise ratio (often abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise. It is defined as the ratio of signal power to the noise power, often expressed in decibels. A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise.