QRM Eliminator X-Phase HF Bands Second Generation Metal Shell (1-30 MHz)QRM Eliminator X Phase 1 30 MHz HF Bands Second Generation Metal Shell Principle: The QRM canceller is inserted into the feeder of the antenna from the trx without any other modifications to the radio. The box has a built in PTT control to keep the canceller connected during transmission. However, this requires an additional auxiliary receiving antenna, such as a 2m 6. 6ft antenna or only a few meters of wire in the shed. The two antennas receive