{"id":9891,"date":"2022-05-14T05:39:46","date_gmt":"2022-05-14T11:39:46","guid":{"rendered":"http:\/\/play.fallows.ca\/wp\/?p=9891"},"modified":"2022-05-12T10:01:22","modified_gmt":"2022-05-12T16:01:22","slug":"diversity-reception-antenna-switch","status":"publish","type":"post","link":"https:\/\/play.fallows.ca\/wp\/projects\/electronics-projects\/diversity-reception-antenna-switch\/","title":{"rendered":"Diversity Reception Antenna Switch"},"content":{"rendered":"

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

My first attempt failed. My second attempt to build a diversity reception antenna switch will work! Here goes. <\/p>\n

My major project last winter as a simple SDR Receiver Matrix Switcher<\/a>. I used off-the-shelf Arduino relay modules to switch antennas and receivers. Results were disappointing. My major challenges were RFI ingress and poor isolation.<\/p>\n

So, during April, I went back to the drawing board. My new diversity reception antenna switch is now up and running in the lab. This time, I did things properly.<\/p>\n

My new design, shown above, uses proven antenna switches and filters. I will describe these in detail shortly. I kept the Arduino relay modules, shown in orange as relay banks 1 and 2, to control the relay switches. This new system can be controlled by WIFI using NodeMCU or by USB serial using Arduino Mega.<\/p>\n

The radio relay switches are shown in white on the left. I provide four pairs of channels. Three support my dual channel SDR receivers – RSPduo, Afedri and ANAN – which the fourth position routes antennas into my NCC-1 phaser. These switches were purchased online.<\/p>\n

The antenna switch, shown in black, routes four antennas into two channels. My default antennas are two loops in an array. Alternatively, I can select my main ham antenna and a noise probe for reducing local RFI. My friend Jim VE6JF built this homebrew switch and it works great.<\/p>\n

Diversity Reception Antenna Switch<\/h2>\n

Control of my AAA-1C wideband loop amplifiers (in green) is provided by relay bank 2. With this, I can switch loop patterns and modes remotely. Finally, I added in an excellent dual channel medium wave bandstop filter with remote control. I am using off the shelf filters with a DIY circuit board for switching.<\/p>\n

Over the next few weeks, I will describe this system in detail, as well as report on results. Here’s hoping I got it right this time!<\/p>\n","protected":false},"excerpt":{"rendered":"

My first attempt failed. My second attempt to build a diversity reception antenna switch will work! Here goes.<\/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":[11,7],"tags":[52,357,246,239,38,22],"series":[368],"class_list":["post-9891","post","type-post","status-publish","format-standard","hentry","category-electronics-projects","category-software-defined-radio","tag-arduino","tag-diversity","tag-hamr","tag-hamradio","tag-sdr","tag-swl","series-dual-channel-antenna-switch"],"yoast_head":"\nDiversity Reception Antenna Switch - Making It Up<\/title>\n<meta name=\"description\" content=\"My first attempt failed. 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