This tool calculates the best interference-free radio frequencies (UHF) within a TV channel (8 MHz grid). Only one TV channel is analyzed in isolation. Additional frequencies from other TV channels are not checked for compatibility.
FreqBuddy is designed for use in Germany. Even if the TV channels are not only used in Germany, the exclusions (radio astronomy and LTE) are adapted to German conditions. Other comments are also applied exclusively to German rules.
Attention: FreqBuddy is a mathematical tool for calculating optimal frequencies. You must check for yourself whether the use of these frequencies is permitted for your application.
First use fmscan.org to find out which TV channels (column “Ch”) are not or only weakly occupied by DVB-T. Completely free channels do not appear in the list and are probably a good choice. Ideally, do not use two directly adjacent TV channels.
These can be mirrored within a TV channel. By default, the spacing increases with each higher frequency (increasing - ↑). This can be reversed (descending - ↓). This is recommended, for example, for a second set of frequencies to be used simultaneously. The second set should be as far away as possible from the first and use the descending frequency spacing instead of the ascending one.
If the transmitter and receiver are to be operated close to each other:
The minimum requirements for intermodulation resistance are met in all cases. These values apply to the increasing frequency intervals. The order must be reversed for the descending frequency intervals.