X-Phase QRM Eliminator 1.8 to 30Mhz

X-Phase-01.jpg X-Phase-02.jpg
Usage:

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



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Schematic

X-phase-schematic.jpg

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References

VK5TM Noise Canceller:
https://vk5tm.com/homebrew/noisecancel/noisecancel.php

:
https://a43.veron.nl/wp-content/uploads/2020/04/X-Phase_eng.pdf

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

https://www.pa9x.com/review-of-the-qrm-eliminator-x-phase/

:
https://www.ra0sms.ru/p/qrm-eliminator-x-phase.html

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20210824 - pre published v0.9