X-Phase QRM Eliminator 1.8 to 30Mhz

  1. Schematic
  2. References
  3. References


X-Phase-01.jpg X-Phase-02.jpg

Turn on the unit, adjust GAIN1 to have the noise signal with same level on both antennas, then adjust with the PHASE and GAIN2 knobs the noise, both alternatively, to a minimum of noise. Then adjust the GAIN1 knob for less noise. If not possible, readjust the PHASE and GAIN2 knobs again until the minimum can be found. A bit difficult at first try, don't give up to early!
When found a minimum the local noise has to be nearly or totally gone and the wanted signal will be left over. If this signal is gone as well => the aux. antenna picks up to much of the wanted signal AND of the noise, change /modify the antenna. As all 3 knobs interact with each other, the adjustment can be a bit tricky.

When you believe, the unit does not work.... use your antenna analyzer as signal generator, put it somewhere in the shack. Connect both antenna jacks with a little banana lead and check for a S9 signal from your analyzer. Then with GAIN fully counterclock-wise, the signal must be phased out after adjusting the PHASE and GAIN2 knobs.

WARNING:Must have a PTT connection before Transmitting






VK5TM Noise Canceller:


Review of the QRM Eliminator X-phase
Posted on April 6, 2019 by Jean-Paul Suijs - PA9X :






Glenn Lyons VK4PK
Ver:gnl20210824 - pre published v0.9