Mapleham Study: Telephone RFI and PA Systems (B-008-002)

Telephone RFI and PA Systems (B-008-002)

Telephone RFI — cabling acts as an antenna, install a modular plug-in RFI filter close to the telephone device
PA System RFI — long speaker leads act as antennas, picking up SSB as distorted speech and CW as on-and-off clicking or humming