What’s the main reason for narrow-band roofing filters? The first is that they attenuate signals. While this reduces the SNR, it does not affect the receiver’s overall performance. If you’ve ever heard of a crowded band, you probably know that roofing filters can create a similar problem. For example, a CF-600/6 filter can lead to a huge CW DX pile-up. It’s important to remember that no DSP can fix these problems, so it’s necessary to use a roofing filter. In addition, roofing filters can increase IMD3 – a metric that measures how much signal gets filtered. roofing contractors
Luckily, modern transceivers have DSP filters, but some still use a roofing filter. These filters filter incoming signals before the intermediate frequency stage. They block strong signals that would otherwise overload the amplifier stages. As a result, narrow-band roofing filters help improve the receiver’s dynamic range. However, there are other disadvantages to narrow-band roofing filters. Here are some of them.