Post AXdYXDO1wXns975fXs by freemo@qoto.org
 (DIR) More posts by freemo@qoto.org
 (DIR) Post #AXdYXDO1wXns975fXs by freemo@qoto.org
       2023-07-13T02:02:45Z
       
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       so i decided im putting back up my HF antenna, doing it all new! I'm excited.
       
 (DIR) Post #AXdZZeC7LL27p3F47c by brouhaha@mastodon.social
       2023-07-13T02:14:23Z
       
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       @freemo Cool!In August I'm planning to put up a 2m/70cm J pole. I want to try measuring it with a NanoVNA to see whether it has low enough SWR to also be usable at 1.25m. I suspect not, but it seems worth checking.
       
 (DIR) Post #AXdZhA31JOe4dmZNdg by freemo@qoto.org
       2023-07-13T02:15:46Z
       
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       @brouhaha SWR tells you nothing about its suitability for a particular frequency.. Remember a 50 ohm resistor is 1:1 SWR and a dipole fed with a ladder line is a good performer even at 10:1 SWR
       
 (DIR) Post #AXdcKkL6VvJGOp21tA by Hawk1291@fosstodon.org
       2023-07-13T02:45:21Z
       
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       @freemo haha walked into that one. Are you building an antenna or did you get something ready to go?
       
 (DIR) Post #AXdpp6c1ZDaFZLkjOy by brouhaha@mastodon.social
       2023-07-13T05:16:30Z
       
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       @freemo My transceiver isn't rated for 10:1, though. I'll have to look up the specs. If the measured SWR exceeds to transceiver specs, at least I'll know not to try it.
       
 (DIR) Post #AXdpwwb6gZcepF3rRg by freemo@qoto.org
       2023-07-13T05:17:54Z
       
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       @brouhaha thats irrelevant. You just stick a tuner on it or add a capacitor/inductor to match at the feed point.
       
 (DIR) Post #AXdrKiH7gfV3JGbzcW by kentborg@social.tchncs.de
       2023-07-13T05:33:25Z
       
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       @freemo @brouhaha SWR tells one a lot. Such as "I need some sort of matching here".
       
 (DIR) Post #AXdrPugQyt4bF0vkmG by freemo@qoto.org
       2023-07-13T05:34:20Z
       
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       @kentborg @brouhaha Yup, it tells you a lot. Suitability as a transmitter is not usually one them.
       
 (DIR) Post #AXeFxyRPuisJdpgFvs by RFDave@mastodon.social
       2023-07-13T10:09:22Z
       
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       @freemo @brouhaha the only thing SWR tells you is how well something is matched to 50ohms. There’s no information about radiating efficiency there.
       
 (DIR) Post #AXegM2ITpLDrMHdPqi by freemo@qoto.org
       2023-07-13T15:05:06Z
       
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       @RFDave @brouhaha Well its a bit more than that, but yea, SWR doesnt substitutde for radiation effiency