{"id":10064,"date":"2020-10-30T05:28:30","date_gmt":"2020-10-30T11:28:30","guid":{"rendered":"http:\/\/ergo.fallows.ca\/wp\/?p=10064"},"modified":"2020-10-16T13:44:31","modified_gmt":"2020-10-16T19:44:31","slug":"wideband-receiving-loop-array-up-and-running","status":"publish","type":"post","link":"https:\/\/ergo.fallows.ca\/wp\/radio\/shortwave-radio\/wideband-receiving-loop-array-up-and-running\/","title":{"rendered":"Wideband Receiving Loop Array Up and Running"},"content":{"rendered":"

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

It’s taken a while, but I finally have my wideband receiving loop array up and running. And, it works great for medium and short wave listening. <\/p>\n

More than forty years ago, an article in Ham Radio Magazine sparked my interest in a wideband receiving loop array. In May 1978, Henry Keen W5TRS described an active receiving system useful from 75 through 10 meters capable of directing a null toward the interference source. His system used a couple of short active antennas with close spacing. (See Selective Receiving Antennas<\/a> on page 20.)<\/p>\n

Over the past two years, after I got my first dual channel coherent receiver (Afedri AFE822x) I have been experimenting with diversity reception using multiple antennas to null interference and reduce noise. But what I really wanted to try was building and phasing a wideband receiving loop array.<\/p>\n

And, now my dream has become reality.<\/p>\n

I have installed two 1-meter loops, each powered by the AAA-1C active antenna amplifier kit<\/a> from LZ1AQ. What with COVID mail delays, the second amplifier took more than 2 months to arrive. Each antenna is a set of switchable crossed loops<\/a>, oriented N-S and E-W. Spacing between my loops is 100 feet, or around 30 meters. Each is fed to my shack with equal lengths of CAT7 cable.<\/p>\n

You can see my setup in the picture above, thanks Google Maps. A block diagram of the system is shown upper right. Antenna phasing and summing is performed digitally in the receiver.<\/p>\n

Wideband Receiving Loop Array Basic Operation<\/h2>\n

To start out, I have been using this phased array on shortwave using the SDRplay RSPduo<\/a>, and on medium wave with the AFE822x<\/a>. Typically, the eastern loop (right, above) supports Tuner 1 on each receiver, and the west loop (left, above) Tuner 2.<\/p>\n

Usually, arrays are designed with element spacing between \u03bb\/4 and \u03bb\/2. At 30 meters spacing, this means the sweet spot for this array is 2.5 to 5.0 MHz. But I find it works well outside this range.<\/p>\n

Below \u03bb\/4, my pattern has one or two wide lobes, while above \u03bb\/2 spacing we find more like 3 or 4 narrower lobes, depending on phasing. On 540 kHz BCB, I can get a 6 dB increase by summing both loops in phase, and a 35 dB null by summing out of phase.<\/p>\n","protected":false},"excerpt":{"rendered":"

It’s taken a while, but I finally have my wideband receiving loop array up and running. And, it works great for medium and short wave listening.<\/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_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Wideband Receiving Loop Array Up and Running #hamr #hamradio #lz1aq #magloop #SWL","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"enabled":false},"version":2}},"categories":[18],"tags":[11,7,43,44,6],"class_list":["post-10064","post","type-post","status-publish","format-standard","hentry","category-shortwave-radio","tag-hamr","tag-hamradio","tag-lz1aq","tag-magloop","tag-swl"],"yoast_head":"\nWideband Receiving Loop Array Up and Running - ERGO<\/title>\n<meta name=\"description\" content=\"It's taken a while, but I finally have my wideband receiving loop array up and running. 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