How to takle rf-noise

or how to Improve Receiver Bliss.

Let's start with the basics first.

Receiver gain setup

I always setup my receiver(s) with just enough attenuation/gain to make sure that the AGC only acts on the signal I'm listening too.
I have the preamps switched off on all band from 20m and above (14MHz and below). Depending on the band conditions I either use the build in attenuator or the RF-gain. Below are the steps that I use to achieve receiver bliss.

• Record the S-meter reading of the band noise on a clear frequency. I.e., Tune away from the signal you are listening too and note the S-meter reading off the band noise alone.
• Now apply attenuation until the S-meter reads as little as possible. (On the IC-7610 I can select the attenuation in steps of 3dB) A similar outcome can be achieved using the the RF-gain as well.
• Next tune to the desired signal. The result is that now the band noise will not stimulate the AGC into action i.e., the AGC will now only operate on the desired signal.

We now have selected the receiver sweet point for the current band conditions.

The result is a very quite receiver which is very pleasant to listen to.

 

Receiver Noise Counter Measures

or how to make sure we can hear those QRP stations!