Posted by Robert, VA3ROM [ va3rom@gmail.com ] on December 19, 2022 at 02:31:47.

In Reply to: Re: Airspy HF+ Discovery posted by swlem3 on December 18, 2022 at 14:19:44.

Evening Ray, A few links to various QRM designs. Pricey version from Germany but another variant sold on eBay. The design looks to be pretty simple to implement and probably much like what MFJ also sells. www.ebay.ca/sch/i.html?_from=R40&_nkw=qrm+eliminator+x-phase&_sacat=0&rt=nc&LH_PrefLoc=3 www.amateurradio.com/noises-off-wmo-qrm-eliminator/ g8jnj.net/rfnoisecancellation.htm Hope some of this info helps you out, Ray. 73, Robert ---------------------------------------------------------------   File Attachment 1: RF_Noise_Cancellation_Circuit.jpg

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