Ht Spread Spectrum

Ht Spread Spectrum

Spread-Spectrum Radios
Minimize noise and interference from RF sources

Communications / Spread-Spectrum Radios

About Spread-Spectrum Radios
Spread-spectrum radios are very popular for creating wireless communication links to and between data loggers. These low-cost devices provide robust links ranging in speeds from 10 to 200 kbps and distances of 3 to 50 miles, depending on the radio model and operating conditions. These radios consume little power and are easy to install and maintain, as they have been designed for low-power, non-licensed operation. Spread-spectrum radios spread the normally narrow-band information signal over a relatively wide band of frequencies. This allows the communication to be highly immune to noise and interference from RF (radio-frequency) sources.

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If you are unsure if spread-spectrum communications is right for you, you can try before you buy. Campbell Scientific offers a 900 MHz spread-spectrum demonstration kit that allows you to easily test communications from one point to another using the RF407 and RF451 radios.

Number of FAQs related to Spread-Spectrum Radios : 5

No. Removing the interference will remove the radio signal. The radio, like all FCC Part 15 devices, is not allowed to cause harmful interferences to licensed radio communications and must accept any interference that it receives.
No. A spread-spectrum radio, like all FCC Part 15 devices, is not allowed to cause harmful interferences to licensed radio communications and must accept any interference that it receives.
Yes. Two spread-spectrum radios can be used to connect two computers.
Spread-spectrum radios work by frequency hopping and transmitting at discrete frequencies over part of the unlicensed band, rather than by transmitting over a very wide part of the spectrum as some other devices do.
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-Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.

Up to 1.61 km (1 mi) with omnidirectional antenna; up to 16.09 km (10) mi with higher-gain directional antennas at ideal conditions

-Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.

20.92 to 96.56 km (13 to 60 mi) depending on antenna and line-of-sight

-Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.

Up to 1.61 km (1 mi) with omnidirectional antenna; up to 16.09 km (10 mi) with higher-gain directional antennas at ideal conditions

EMEA (Europe, Middle East, and Africa)

-Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.

Up to 5 km (3.11 mi) depending on antenna and line-of-sight

-Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.

Up to 1.61 km (1 mi) with omnidirectional antenna; up to 16.09 km (10 mi) with higher-gain directional antennas at ideal conditions

-Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.

Up to 1.61 km (1 mi) with omnidirectional antenna; up to 16.09 km (10 mi) with higher-gain directional antennas at ideal conditions

-Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.

Up to 1.61 km (1 mi) with omnidirectional antenna; up to 16.09 km (10 mi) with higher-gain directional antennas at ideal conditions

Any country where 2.4 GHz Wi-Fi communications are allowed

0.4 km (0.25 mi) with omnidirectional antenna (outdoors); up to 0.8 km (0.5 mi) with higher-gain directional antennas at ideal conditions

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Friday, October 15, 2010 10:13 PM

( permalink )

Should this be disabled or is it just a power saving issue? And if I disable all of them will this help with performance Thanks. CPU Spread Spectrum: [Disabled] HT Spread Spectrum: [Disabled] PCle Spread Spectrurn(SPP): [Disabled] PCle Spread Spectrurn(MCP): [Disabled] SATA Spread Spectrum: [Disabled]

Re:Spread Spectrum

Saturday, October 16, 2010 0:00 PM

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Someone else might be able to shed more light on the specifics, but yes as a rule of thumb disable them all.

Re:Spread Spectrum

Saturday, October 16, 2010 5:18 AM

( permalink )

D.M.W.T Someone else might be able to shed more light on the specifics, but yes as a rule of thumb disable them all. +1......Tonn-Fo!!!!

Re:Spread Spectrum

Saturday, October 16, 2010 7:01 AM

( permalink )

Spread-spectrum clocking is a fundamental way that electronic devices can contain oscillators but not produce more electromagnetic interference than allotted by the Federal Communications Commission (FCC). The history of spread-spectrum clocking begins with the fundamentals of electronic devices. Most electronic devices today are equipped with a type of local oscillator that continuously generates a clock signal for other synchronous components to use. Most electrical components that use this type of oscillator can cause this tone to be transmitted in the form of electromagnetic interference (EMI) to other devices in the area. To prevent this interference, the FCC in 1975 enacted FCC Part 15 that regulates the output power of these clocks in electronic devices. Engineers needed a method to keep their devices from overstepping this limit, so they started using spread-spectrum clocking in their devices. In theory, spread-spectrum clocking means that the tone is varied so that the clock signal varies continuously around the desired frequency. For example, for a 1 GHz processor, the frequency might be 999.5 Mhz at one moment in time and 1.0005 GHz at another. Doing this constantly causes the power of the tone to be "spread" out more over a broader band of tight frequencies centered at the desired tone. *Also, it's not a good idea to have them on when overclocking, as it can cause system instability. I advise to keep the settings disabled.

Re:Spread Spectrum

Saturday, October 16, 2010 6:08 PM

( permalink )

Thanks Xray great article I disabled them all.

Re:Spread Spectrum

Saturday, October 16, 2010 6:35 PM

( permalink )

ooooh Mr science guy. J/K, thanks Xray thats the type of info I was hoping he would eventually receive.

Re:Spread Spectrum

Sunday, October 17, 2010 2:30 AM

( permalink )

Your welcome, my fellow forum bros. :)

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