The Input Frequency Solution (Major Interference Cases)
The ultimate solution is to eliminate the 5G interfering signal before it enters the LNB in the first place.
This can be done in two ways:
Fig. 1 – Install Av-Comm’s range of C Band LNBs with inbuilt Bandpass Filters.
Fig. 2 – Install a standalone Waveguide Filter which is placed between the Feedhorn and the input of the LNB.
These solutions offer the highest rates of success, by providing up to 75dB of protection against 5G interference. In the most severe cases, a filtered LNB and a standalone Waveguide Filter can be used together to offer the ultimate protection against any interference.
It should be noted that standalone Waveguide Filters create insertion loss which may be unacceptable, depending on the link budget information specific to the downlink site. The insertion loss of a typical standalone Waveguide Filter will result in a carrier to noise (C/N) reduction by ~0.5-1.0dB.
Over the past decade Av-Comm has developed a range of C Band LNBs with inbuilt Bandpass Filters to solve out of band interference cases. Av-Comm’s preferred method to eliminate C Band interference, is to use an LNB with inbuilt Bandpass Filter. We believe this approach is optimal because unlike standalone Waveguide Filters, Av-Comm’s filtered LNB solutions do not suffer from insertion loss and provide a more cost effective solution.
The table overleaf shows the specifications on our LNB and waveguide filter range, full specification sheets along with frequency plots are available on request. High stability (5Khz) versions of all LNBs are also available for improved reception of MPEG4 signals.