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Post by Paul OM0ET (Admin) on May 13, 2019 14:35:08 GMT
Here are some pictures from measuring of my Mini 9:1 UnUn. I have made a little tool - variable resistance set on 450 ohms. 9:1 UnUn should transform it to 50 ohms. And he did it 😉👍 see the pictures.
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Post by Paul OM0ET (Admin) on May 13, 2019 17:54:05 GMT
I have connected 450 ohm resistor in to input of the UnUn and measured output impedance with transceiver X5105. SWR was flat on 1.1 except on 6m band.
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Post by Paul OM0ET (Admin) on May 13, 2019 17:56:54 GMT
Other bands... Attachments:
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Post by juanjosecastillo on Jun 8, 2019 6:53:31 GMT
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Post by Paul OM0ET (Admin) on Jun 9, 2019 5:23:41 GMT
Excellent made Juan!! Did you tryed already? Or did you tests with 450 ohm resistor? I wonder how it works to you 😉👍 No problem with the FB links or any others 👍 Better results you will get when use better ferrite material of the core. 😊 Less attenuation.
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Post by Joe KC2JYD on Apr 25, 2020 1:43:26 GMT
Hello Paul do you have a parts list of the materials you used to build the 9:1? Also what type of drillbit was that? Thank you
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Post by Paul OM0ET (Admin) on Jun 12, 2020 20:25:44 GMT
Hello Paul do you have a parts list of the materials you used to build the 9:1? Also what type of drillbit was that? Thank you Sorry Joe but I don't have such a list But I used a 25mm PVC tube, two caps, Screw, BNC connector, two small toroids and I am not sure about diameter enameled wire.
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Post by Dylan Lathrop on Jun 28, 2021 19:06:52 GMT
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