Post 9xPywU99TFjyl0j3ui by Hammut@mastodon.aventer.biz
(DIR) More posts by Hammut@mastodon.aventer.biz
(DIR) Post #9xPZkCBruMCyjp2WKe by F1RUM@mastodon.radio
2020-07-24T10:50:44Z
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Is it necessary to have an antenna tuner in QRP mode (<5W) ?If it is, which one to put in backpack ?Or how do you do when you go to field with a small transceiver and a long wire antenna ?(I have so many questions)
(DIR) Post #9xPZkDg2Nfw1LgA7zk by Hammut@mastodon.aventer.biz
2020-07-24T12:53:21Z
0 likes, 1 repeats
@F1RUM There is no answer when to use a tuner under any circumstances nor depending on the power you use. If you operate single band, e.g. 40 m, you are able to tune the lenght of the radiator directly. So try it on ur own. There is no shortwave (portable) antenna that works "out of the box".
(DIR) Post #9xPr9UyostgHTOaTtw by sp6mr@mastodon.radio
2020-07-24T12:37:02Z
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@F1RUM I've heard good stuff about LDG Z-11PRO II, but it's kinda pricey, so I am still considering whether to get it or not. You can also tune the antenna by hand, that's what we did once
(DIR) Post #9xPr9VnVqQEM0cIxuq by F1RUM@mastodon.radio
2020-07-24T13:25:07Z
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@sp6mr not cheap, effectively.I don't know if it is easy to use it in field : need power, 20cm long, 630gr...Prepare an antenna for a specific band seems to be a good idea ( @Hammut )What the simplest (and cheaper) way to tune an antenna (understand have a wire at the good length)
(DIR) Post #9xPr9WgoWoSym8B876 by sp6mr@mastodon.radio
2020-07-24T13:30:34Z
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@F1RUM @Hammut It takes batteries as a power source, and I've heard those can last a few years in there. The way we have tuned an inverted v was to simply make the wire longer or shorter, by wrapping it around itself. Definitely not the most optimal, but easy to do and does not destroy the antenna
(DIR) Post #9xPr9XNLyeUgu456Q4 by F1RUM@mastodon.radio
2020-07-24T13:32:47Z
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@sp6mr And which device do you use to tune the antenna ?@Hammut
(DIR) Post #9xPr9YU7qxVOLMG1c8 by Hammut@mastodon.aventer.biz
2020-07-24T16:09:27Z
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@F1RUM As told before - there is no easy answer for everyone. It depends on your needs. I sometimes use a PI-Network ( not so good) or LC-Network (better) or no tuner (best) because a resonant antenna (with SWR <2:1) needs none. Antennas are a very interesting discipline of ham radio. You have the chance to learn a lot. After years I am improving my equipment. That's it. I won't miss it.@sp6mr
(DIR) Post #9xPxSHBH0rUpu2kX0C by sp6mr@mastodon.radio
2020-07-24T13:35:17Z
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@F1RUM @Hammut We used Arduino + RigExpert AA-32 Zero connected to the laptop. I've heard that there are some ways to use it without a laptop, though, as it's essentially an Arduino shield. I guess NanoVNA would be even better in that regard
(DIR) Post #9xPxSJDpQKjEEXxbGK by Dubby@mastodon.radio
2020-07-24T16:45:27Z
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@sp6mr @F1RUM @Hammut NanoVNA would be perfect for that
(DIR) Post #9xPxSKVadmWwDvHIaO by Hammut@mastodon.aventer.biz
2020-07-24T17:20:06Z
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@Dubby @sp6mr @F1RUM Well, I see you plan to analyze the antenna and its complex loads. - ok but that's more than simple tuning. In my opinion this belongs to real antenna- construction. In Field a simple SWR-Meter will do the job.
(DIR) Post #9xPywPHTYsQbfNa8h6 by F1RUM@mastodon.radio
2020-07-24T17:19:26Z
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@HammutI have to review my amateur lessons. I passed my exam about 30 years ago and do not practice until last year.Thanks for your help @sp6mr
(DIR) Post #9xPywU99TFjyl0j3ui by Hammut@mastodon.aventer.biz
2020-07-24T17:36:51Z
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@F1RUM👍F ... orget it. When the french lessons where like in germany they where scratching the skin a bit / passing the exam. You better should have contacts to experienced OP. Are you in the club?
(DIR) Post #9xQGQGKp5MZjpSyAyG by F1RUM@mastodon.radio
2020-07-24T20:29:26Z
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@Hammut If I understand :1) NanoVNA is useful to construct an adapted antenna for a specific band, after that, this antenna will not need to be tuned and will be able to be connected directly to TX2) Automatic tuner is needed for wire/multiband antenna or if not really adapted to used frequency3) SWR-meter controls, between TX and antenna that all is fine and could used to correct antenna settings (but less easily than with a VNA)Is it good? @sp6mr
(DIR) Post #9xQGQHWudtq9XFdLSC by Hammut@mastodon.aventer.biz
2020-07-24T20:52:33Z
0 likes, 1 repeats
@F1RUM You are right, 100%!Additional remark 3):To use a SWR-meter you need a TRX ( it is passive)VNA is equipped with an oscillator - so you don't need an extra TX and this is one reason it is recommended for practical construction. It is much more comfortable to operate than the well known "grid dipper" commonly used 20, 30 years ago.@sp6mr
(DIR) Post #9xRD7vcHGwANefey00 by F1RUM@mastodon.radio
2020-07-24T20:58:29Z
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@Hammut Yes ! 💪One more question. Is it possible with an SWR-meter to know if your wire is too long or to short to help you in setting up ? Or it can just tell you that it is adapted or not ?@sp6mr
(DIR) Post #9xRD7w3vc8Hh2Qb368 by Hammut@mastodon.aventer.biz
2020-07-25T07:50:36Z
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@F1RUM It is - if you use a general coverage TRX. For single band use any TRX will do the job.@sp6mr
(DIR) Post #9xRMg4NS6ZWuGA51Qu by Hammut@mastodon.aventer.biz
2020-07-25T09:37:40Z
0 likes, 1 repeats
@F1RUM RSGB has good infos for beginners. https://rsgb.org/main/get-started-in-amateur-radio/antennas/your-first-antenna-the-half-wave-dipole/