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Apr 01, 2019, 05:02 PM
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Quote:
Originally Posted by gppsoft
a relay for ultimate lrs
Little more details please I see TX module board, DC-DC converter, BT module. Is it external LRS box like ExpertLRS, or 2.4 GHz -> 433 MHz relay ?
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Apr 01, 2019, 05:06 PM
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Quote:
Originally Posted by gppsoft
Stock antenna is very bad
...and has much less interference effects due to less efficiency . It is all about MMANA-GAL calculated Vee dipole.
Apr 01, 2019, 05:24 PM
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Quote:
Originally Posted by RD00
Little more details please I see TX module board, DC-DC converter, BT module. Is it external LRS box like ExpertLRS, or 2.4 GHz -> 433 MHz relay ?
Ok. This is 2.4->433 relay with bluetooth for configure . R6DS(Radiolink) and RFM23B powered by DC-DC 5v. Now I think what to do with the receiver.
Apr 01, 2019, 09:55 PM
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I think this is appropriate time to start ULRS thread on the http://forum.rcdesign.ru . We have Expert- and Baichi- type firmwares focused on high ranges due to low bandwidth but no one started from fully symmetrical channel.
Apr 01, 2019, 11:49 PM
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Quote:
Originally Posted by RD00
I think this is appropriate time to start ULRS thread on the http://forum.rcdesign.ru . We have Expert- and Baichi- type firmwares focused on high ranges due to low bandwidth but no one started from fully symmetrical channel.
OK. Let's start! Create a topic on the site?
Apr 02, 2019, 12:15 AM
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Or you.
Apr 02, 2019, 01:03 AM
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Quote:
Originally Posted by RD00
Or you.
But does it make sense? The project does not develop and is unlikely to develop, according to the author.
Apr 02, 2019, 09:21 AM
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Quote:
Originally Posted by flipflap
I don't understand what you don't understand ?

A dipole antenna has two sections by definition (else it's a monopole antenna).

Maybe this video will clarify :

https://www.youtube.com/watch?v=_ZC3tTWyW4w
I meant the two sections I have marked with a circle. In that image I see a main section with a total length of 26,94 mm, and another section with 34,11mm. In a normal dipole antenna there is just one section (a half for each pole). It doesn't even match your antenna ruler which shows 15,14 mm of section for each pole for that frequency (439 mhz aprox.)with a total length of 30,28. That's why I don't understand the design.
Last edited by gcp900; Apr 02, 2019 at 10:18 AM.
Apr 02, 2019, 12:06 PM
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Quote:
Originally Posted by RD00
start ULRS thread on the http://forum.rcdesign.ru
Done.
Apr 02, 2019, 02:25 PM
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Thread OP
Thanks but please remove my name, and you can mention that there's also an open source version (ULRS 1.X).
Apr 02, 2019, 05:46 PM
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If loss of telemetry will failsafe? Or control will work without telemetry while it is available?
Apr 02, 2019, 09:30 PM
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Thread OP
Quote:
Originally Posted by gcp900
I meant the two sections I have marked with a circle. In that image I see a main section with a total length of 26,94 mm, and another section with 34,11mm. In a normal dipole antenna there is just one section (a half for each pole). It doesn't even match your antenna ruler which shows 15,14 mm of section for each pole for that frequency (439 mhz aprox.)with a total length of 30,28. That's why I don't understand the design.
If I'm right this is a sleeve dipole, and the coax sections act as a balun. I don't know exactly the math for their length but the goal is to improve the SWR.
Apr 03, 2019, 07:04 AM
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@flifplap
i wonder if i flash firmware 433MHZ but use with hardware 868mhz , it work ? Or have to modify firmware to use band 868mhz ?
Apr 03, 2019, 07:20 AM
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Thread OP
Won't work, at least not work well because there are many parameters dependent on frequency.
Apr 03, 2019, 07:35 AM
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Quote:
Originally Posted by flipflap
Thanks but please ...
OK, sorry. It is not editable yet, but I'll ask moderator.

UPD: done.
Last edited by RD00; Apr 03, 2019 at 10:08 AM.


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