Yes, European LoRa is 867 - 869 MHz. Much smaller than North America (902 - 928). This restricts Europe to only 10 channels while NA has 64+8+8 channels. Downlink BW is also smaller in Europe at 125 KHz while Na can run at 500 KHz. Europe definitely got the short end of the stick on this deal...
I wonder if the crimping marks on the coax are created by the grips of the machine that cut and stripped the ends? Are they the same distance from the ends?
Looks like you didn't have to take the Radome off of the base. You may have just unscrewed from the bottom. Would this be a colinear antenna ? As for the dents I think they do it to hold the section assembly together . Thanks for the video.
If I wanted to build one for 923 MHz, do I google 'coax colinear antennna'? Is that what this wire in tube design is? Seems simple enough, soldering copper wire in brass tubes with plastic disc plugs. What's the funky bit at the bottom with the extra brass shim on it?
I see higher quality "legit" brands that are 1.5m long claim a very uniform 8-dbi of gain, so for this to be 1.1m, I'd imagine it will come up a bit short on the true db. who knows though. It's a fun video and entertaining; thank you.
I’d be curious to see if the lightning arrester they provided has any effect on the antenna resonance. I’m really shocked with the internal construction refuse to be built very well he could’ve achieved the same design using coax for a lot less money.
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The dimples are there to create friction, just to help hold the dielectric in place during assembly, as they will slide right out of the brass tube.
I would love to see those measurements both with and without the lightning arrestor, just to see what effect it has.
The 868MHz frequency band is used for LoRa in Europe instead of the 915MHz used in the Usa.
Yes, European LoRa is 867 - 869 MHz. Much smaller than North America (902 - 928).
This restricts Europe to only 10 channels while NA has 64+8+8 channels.
Downlink BW is also smaller in Europe at 125 KHz while Na can run at 500 KHz.
Europe definitely got the short end of the stick on this deal...
@@EngineeringVignettes as usual
I've got a 1090 MHz antenna used for ADS-B reception that looks almost identical to this one. Nice to see what the insides look like.
Would be great for meshtastic in both US and EU
868MHz is the EU Lora
That antenna is dual band for EU 868MHz and US 912MHz Lora
905.something is the Long Fast used by Meshtastic.
I wonder if the crimping marks on the coax are created by the grips of the machine that cut and stripped the ends? Are they the same distance from the ends?
Looks like you didn't have to take the Radome off of the base. You may have just unscrewed from the bottom. Would this be a colinear antenna ? As for the dents I think they do it to hold the section assembly together . Thanks for the video.
I built similar coax collinear for 1090MHz. Simple and easy
If I wanted to build one for 923 MHz, do I google 'coax colinear antennna'? Is that what this wire in tube design is? Seems simple enough, soldering copper wire in brass tubes with plastic disc plugs. What's the funky bit at the bottom with the extra brass shim on it?
@@davidtaylor6124 Look at this: ruclips.net/video/WDCsK73SC4c/видео.html
and more: ruclips.net/user/results?search_query=coax+collinear+antenna
I see higher quality "legit" brands that are 1.5m long claim a very uniform 8-dbi of gain, so for this to be 1.1m, I'd imagine it will come up a bit short on the true db. who knows though.
It's a fun video and entertaining; thank you.
I’d be curious to see if the lightning arrester they provided has any effect on the antenna resonance. I’m really shocked with the internal construction refuse to be built very well he could’ve achieved the same design using coax for a lot less money.
But dual band? That would be a good trick.
900 m Band, pretty interesting frequency 😂😂😂
yeah imagine a 5/8 vertical for that one lol ;)
nice vid,
866MHz is European ISM band