{"id":43158,"date":"2020-05-07T07:43:23","date_gmt":"2020-05-07T11:43:23","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=43158"},"modified":"2020-05-07T07:43:23","modified_gmt":"2020-05-07T11:43:23","slug":"patrizios-simple-homebrew-ncpl-antenna","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2020\/05\/patrizios-simple-homebrew-ncpl-antenna\/","title":{"rendered":"Patrizio’s simple homebrew NCPL antenna"},"content":{"rendered":"

\"\"<\/a>Many thanks to SWLing Post<\/em> contributor, Patrizio Cardelli, who writes:<\/p>\n

I’m Patrizio (SWL I – 5184 \/AN) from Riva del Garda, Italy.<\/p>\n

A few days ago, I built a Noise-Cancelling Passive Loop (NCPL) antenna. I built the 1:1 balun with a couple of ferrite 175 – 285.<\/p>\n

I got a good result on medium wave on my ICOM IC R 71 E with the antenna inside my house installed behind the desk just to avoid any problems with my wife.<\/p>\n

On shortwave, the signal was low in comparison with the Bonito mini whip but in my QTH I have a lot of QRM and with this antenna I solved my problem.<\/p>\n

Yesterday I tried the balun with my random wire (15,2 meter long) also with good results.<\/p><\/blockquote>\n

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About my NCPL antenna: I made mine with RG-58 coaxial cable just to have easy portability in SOTA (please see photo) and also the feed line is made by the same coaxial cable. OK, you are right…it’s ugly:<\/p><\/blockquote>\n

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Electrical connections are not soldered, still I don\u2019t see any mechanical issues and this antenna since it is made for SWL \/ BCL purposes (meaning, RX only, no TX).<\/p>\n

Concerning the binocular ferrite core, I didn’t have one, so I used two ferrite core type 175 \u2013 285 (28,5 mm length, external diameter 17,5 mm and internal diameter 9,5 mm) normally used to reduce HF interference:<\/p><\/blockquote>\n

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For the winding I used PVC insulated cable cat no: 7\/0,2 type 2 (def61 \u2013 12) conductor 7\/0,2mm TSCu X 0,3mm R\/T type single (4 turns primary and 4 turns secondary). It\u2019s the same cable with which I built my random wire antenna (also portable for SOTA but now installed on my balcony until the COVID \u2013 19 emergency is over).<\/p>\n

The attached videos show the situation in comparison with my BONITO MINI WHIP active antenna (also installed inside my house). Recently I changed my QTH and unfortunately here I have a lot of interference both on MW and SW. The better results that you can hear are achieved with my NCPL antenna.<\/p>\n

I have made this test with my ICOM IC R 71 E + BHI noise cancellation speaker\u2026..you can assess yourself, the better results that you can hear are achieved with the NCPL antenna and in the case of Tecsun PL-660 without any noise cancelling filter (BHI speaker off).<\/p><\/blockquote>\n