Power level of the received signal and SNR

The SNR or S/ N (Signal-to-Noise Ratio) parameter is given in decibels (dB). It describes the ratio at the frequency in question.

The speed rate of wireless link depends on the power level of the received signal and its ratio to the noise. Even well -balanced radio link will be useless in case of high noise level. We have no influence on ambient electromagnetic noise level. The noise includes all unwanted radio signals that can deteriorate operation of wireless link or even make it idle. If the interference is in the working channel, even high power level of the received signal will not protect us against decrease of transfer rate.

Unexpected transmission interruptions and/or large number of lost packets can indicate decrease of SNR, e.g. some interference has occurred.
However, the most frequent reasons of SNR decrease are: water -soaked RF cable connecting the RF device with the antenna (e.g. due to damaged sheath), water -soaked connector(s), moved antenna (especially in the case of offset or parabolic antenna with narrow half -power beamwidth), mechanical damage of the antenna. The diagnostic testing of the installation has to be started with inspection of the physical condition of these elements. The quality of the components used is vital for reliability and longevity of every installation.

The problem with interferences is more difficult to tackle. It may be a "competing" service provider using the same or close channel. The countermeasures include:

* change to other, free channel
* change of polarization of the antennas
* use of client antennas with narrower beamwidth
* increase of RF power levels
* change to more powerful antennas

Featured Product

ELK Products -C1M1 Dual-Path Alarm Communicators with Remote Services

ELK Products -C1M1 Dual-Path Alarm Communicators with Remote Services

C1M1 offers a truly significant reduction in transmission time in comparison to other communicators that rely on dial capture or data bus decoding. This can result in quicker response time to emergency situations which could save lives and assets. By providing both IP and cellular pathways, C1M1 provides the reliability installers are looking for in an alarm communicator. C1M1 eliminates port forwarding and extra fees for remote access. Installers can remotely upload/download programming changes to M1 controls over IP or cellular using ElkRP2. Consumers can control the M1 remotely via the free ElkLink mobile app and web portal, as well as eKeypad and M1 Touch Pro apps. Other IP-based software and interface partners can connect to the M1 control over the local network through C1M1. C1M1 also provides email/text notifications for arm, disarm, and alarm events. ELK-C1M14GSM supports GSM (AT&T/T-Mobile) networks and ELK-C1M1CDMA supports CDMA (Verizon) networks.