CABLE TV/Satellite RFI Coax Noise Filter, stops 200 KHz-30 MHz interference
CABLE TV/Satellite RFI Noise Filter for VLF, AM broadcast & shortwave from .2-30 MHz – Receive Only - F connector I/O
Purpose. The CMNF-TV is used to suppress RFI noise and interference (in the 200 KHz-30 MHz range) from common mode currents on the coaxial input line of satellite and cable TV receivers.
The filter is designed to have a high RF impedance to noise and interference from common mode currents on the outside of the coax braid while passing RF signal currents on the center conductor and inside of the coax braid to the antenna.
The effectiveness of the filter is dependent upon the amount of common mode noise encountered on the feed line. If your receive system has a large amount of common mode noise current then you should experience a reduction of common mode current which usually as heard as background noise level. Typical choking impedance is shown in the gallery picture.
The filter was quite effective. Was surprised that it actually reduced the noise level more than the signal so S+N/N improved by 1.9 S units. Bill