The narrow bandwidth filters out more noise so your SNR improves. The noise reading should go down to just under Let's say this signal is received through a wide receiver filter bandwidth of 2400 Hz.
If a received CW signal is S9 and the meter reads S7 without a signal, the SNR is 12dB (normally each S-unit is 6dB). SNR(dB) = 10*LOGįor loud signals you can roughly calculate SNR off the S-meter. It is calculated as the ratio of signal power to the noise power. Signal to Noise Ratio (SNR) is a figure of merit that compares the level of a desired signal to the level of background noise. The signal is your radio signal and the noise is atmospheric, electrical, or other interfering radio signals. This is identical to what happens in the Radio Frequency (RF) world where You had to compensate by speaking louder (more signal power) to maintain a conversational voice level against the increased noise level (more noise level power). What has happened is that the background (ambient) noise level has risen, and in order to maintain communications You find yourself shouting to your partner in order to be understood. By the time dessert comes the restaurant and bar area is nearly full. Conversation is easy between the both of you. You and your partner go to an early dinner. Contact me through: to Noise Radio, definition and application to Radio Communications
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