{"id":60,"date":"2015-01-25T11:48:48","date_gmt":"2015-01-25T10:48:48","guid":{"rendered":"https:\/\/pa3csg.nl\/?page_id=60"},"modified":"2019-05-08T08:27:16","modified_gmt":"2019-05-08T06:27:16","slug":"receive-splitters-hf","status":"publish","type":"page","link":"https:\/\/pa3csg.nl\/?page_id=60","title":{"rendered":"Receive splitters HF"},"content":{"rendered":"

To experiment with 2 receive antennas on the lower bands I\u00a0 needed some kind of splitter \/ combiner with some isolation between te ports. A google search brought the following webpage;<\/p>\n

http:\/\/www.dxing.info\/equipment\/rolling_your_own_bryant.dx<\/a><\/p>\n

The fleamarket supplied the right torroids and it was quickly build. It proofed to be a nice design for the lower frequencies.<\/p>\n

The result of my building efforts:<\/p>\n

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The unit open:<\/p>\n

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Measurement of attenuation to one of the ports. Up to 7 MHz it was more or less OK with a 4dB loss.<\/p>\n

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The isolation between the 2 ports is fine on the lower frequencies but is only 10dB on 20 MHz.<\/p>\n

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The same isolation measurement but now from 0-10 MHz<\/p>\n

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Isolation measured from 0-5 MHz<\/p>\n

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To see if the receive splitter would be OK on 138 kHz, a measurement from 0 – 2 MHz. The marker is on 140 kHz.<\/p>\n

Yes the thing just works fine there!<\/p>\n

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Second attempt with splitter as published from the BCC. The article can be found HERE\u00a0 <\/a>This is named CN8WW RX power splitter. It is considerable more wideband and it has a better isolation between the 2 ports.<\/p>\n

Plots are from 0-50 MHz. 5 MHz per division horizontal, 10 dB vertical.<\/p>\n

Top view of the splitter of the Bavarian Contest Club.<\/p>\n

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Plots are from 0-50 MHz. 5 MHz per division horizontal, 10 dB vertical. Losses are a bit higher but frequency range is very nice. Only one plot shown here but both ports were equal.<\/p>\n

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Measurement of the isolation between the output ports, input port terminated with 50 Ohms<\/p>\n

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The plot for the isolation:<\/p>\n

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 <\/p>\n","protected":false},"excerpt":{"rendered":"

To experiment with 2 receive antennas on the lower bands I\u00a0 needed some kind of splitter \/ combiner with some isolation between te ports. A […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":717,"parent":0,"menu_order":38,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"categories":[38,16],"tags":[],"_links":{"self":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/60"}],"collection":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=60"}],"version-history":[{"count":3,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/60\/revisions"}],"predecessor-version":[{"id":718,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/60\/revisions\/718"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/media\/717"}],"wp:attachment":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=60"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=60"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=60"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}