Interference HOW-TO Page 1 - Page 2 - Page 3 - Page 4 - Page 5 - Page 6 Filters This page covers HOW-TO install some helpful filter at your Radio-station transmitter site. LOW-PASS FILTER LF-30A by KENWOOD LOW-PASS Filter First you should get yourself a Low-Pass Filter,- The filter let's RF-Signals below 30MHz pass and attenuates everything above 30MHz. This eliminates al over-tones into higher frequencies,- FM-Radio and TV-Band a.s.o. to be emitted from your transmitter. The Low-Pass Filter is installed on your antenna cable. It should be installet behind any Power Amplifier but before any tuner. Installation of LOW-PASS FILTER Installation of an Purple-4C65 'AMIDON' Toroid core on AC-Power cord RF-Chokes The idea with RF-Chokes is to 'Block' RF-Signal leakage into your power-lines causing interference in other electronic equipment. Make a coil of your AC Power-cord onto the toroid core,- The toroid core need to be made of proper ferrite material color-code with purple or pink. (Code 4C65 or 4A11) You have to make som experiments to get the right numbers of turns,- should be about 6 if working on 27MHz. (Lower frequency = more turns) Installation of Toroid-core on AC Power Cord. Page 1 - Page 2 - Page 3 - Page 4 - Page 5 - Page 6 *** End of page *** <--Back