{"id":8106,"date":"2021-05-22T06:08:54","date_gmt":"2021-05-22T12:08:54","guid":{"rendered":"http:\/\/play.fallows.ca\/wp\/?p=8106"},"modified":"2021-05-04T10:25:36","modified_gmt":"2021-05-04T16:25:36","slug":"all-good-things-qrm-eliminator-wrap-up","status":"publish","type":"post","link":"https:\/\/play.fallows.ca\/wp\/radio\/radio-frequency-interference\/all-good-things-qrm-eliminator-wrap-up\/","title":{"rendered":"All Good Things – QRM Eliminator Wrap-up"},"content":{"rendered":"

\"qrm<\/a><\/p>\n

If you set\u00a0 up noise antennas properly, any of these devices can work for you. That’s the essence of my QRM Eliminator Wrap-up. <\/p>\n

Sadly, all good things come to an end. It’s time for me to return my borrowed NCC-1 and MFJ-1026 to their rightful owners. Thanks VE6KK and VE6AGR, respectively. Also, time for me to provide a QRM Eliminator Wrap-up.<\/p>\n

Our tests showed that the DX Engineering NCC-1<\/a> is a marvel for both reducing local RFI and phasing multiple antennas. I found everything about this unit smooth, precise and lab-instrument quality. As expected for the $850 price, I guess. If you ever have a chance to grab one of these used at a flea market (remember them?) give it serious thought.<\/p>\n

At the other end of the price spectrum, my RA0SMS X-Phase<\/a> actually worked pretty well, especially as a $21 kit. Although somewhat prone to IMD with a wideband antenna, careful adjustment of the antenna attenuation controls sorts this problem in many situations. Phase adjustment is a bit limited and not very symmetrical, though, and there is not really any gain for a noise probe. However, if you have the right antennas, you will find this unit performs okay for RFI reduction, surprisingly well in a few case. Worth a try.<\/p>\n

JPS got this whole thing started with the ANC-4 back in 1995<\/a> which is when I got mine. Thanks to Timewave for keeping it going. Although lacking gain control for the main antenna, it does a great job reducing local RFI. Phase control is a bit touchy (as are all except NCC-1) but results are repeatable and noise null is sufficient for noticeable improvement.<\/p>\n

MFJ introduced its MFJ-1026<\/a> (and 1025 without preamplifier) soon after. I found its performance comparable to the ANC-4. Unfortunately, performance is limited to HF due to hard-wired high pass filter. From what I have read, though, build quality varies with the MFJ, so if you are buying one used check it out first.<\/p>\n

QRM Eliminator Wrap-up Closing Remarks<\/h2>\n

You can read additional notes about how these units performed in my previous articles. Suffice it to say, they all work for noise reduction but only the NCC-1 does a good job at serious receive antenna phasing.<\/p>\n

As discussed many times, the critical factor for RFI reduction with these boxes is the antenna setup, particularly using noise probes<\/a> to pick up RFI rather than desired signals. It’s really all just math, whether done analog or digital with a two channel coherent receiver.<\/p>\n

My conclusions for QRM eliminator wrap-up? First, get the noise antennas right for your specific requirements.\u00a0 Second, use diversity reception if you can. You can do more with I\/Q data at baseband than with any analog box. Third, try any of these devices if you want to enjoy HF reception again on a city lot.<\/p>\n","protected":false},"excerpt":{"rendered":"

If you set\u00a0 up noise antennas properly, any of these devices can work for you. That’s the essence of my QRM Eliminator Wrap-up.<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_share_on_mastodon":"0"},"categories":[9],"tags":[32,33,353,27,352],"series":[354],"class_list":["post-8106","post","type-post","status-publish","format-standard","hentry","category-radio-frequency-interference","tag-anc-4","tag-mfj-1026","tag-ncc-1","tag-rfi","tag-x-phase","series-rfi-cancellation-shootout"],"yoast_head":"\nAll Good Things - QRM Eliminator Wrap-up - Making It Up<\/title>\n<meta name=\"description\" content=\"If you set up noise antennas properly, any of these devices can work for you. 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