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RogerWilco
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Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Sat Jul 20, 2019 7:19 am

@MikroTik: when will this product be added to the products page?
https://gowifi.co.nz/wireless/rbsxtr.html
 
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sebastia
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Re: Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Sat Jul 20, 2019 12:00 pm

Not listed separately, but offered in distribution channel. Grab it if you want...
 
RogerWilco
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Re: Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Sun Jul 21, 2019 2:21 am

Not listed separately, but offered in distribution channel. Grab it if you want...
Don't need to at the moment, I've just purchased the version with the modem. Just wondering if there is any more info on the antenna, etc.
EDIT: found a PDF with some info: https://www.discomp.cz/download/MikroTi ... XT-LTE.pdf

I guess what I want to know if 700Mhz range is covered. It appears that all the variations of the SXT LTE Kit (International, US, 4G) are identical apart from the modem itself. The RBSXTR&R11e-LTE-US covers 700Mhz range... does this mean the others do too - and back to the topic, the modem-less version?
 
mkx
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Re: Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Sun Jul 21, 2019 11:53 am

The PDF linked in previous post shows gain pattern in the bottom two charts. The left chart shows gain as function of frequency in low frequency bands and prooves that the dish is mediocre antenna for these frequencies at best (simple dipole antenna would have gain of around 2dBi but in narrow frequency range). The chart does cover 700MHz band and shows negative gains. Another antenna property, which is not shown but does affect performance, is VSWR ... some antennae don't have bad gain in certain frequency parts, but high VSWR figures make them unfeasible.
The same dish makes a decent antenna in high band (1.7 GHz and higher) and shows that there are actually different varieties of the dish ... selection of LTE modem can not affect antenna gain!
BR,
Metod
 
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krafg
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Re: Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Sun Jul 21, 2019 11:22 pm

The PDF linked in previous post shows gain pattern in the bottom two charts. The left chart shows gain as function of frequency in low frequency bands and prooves that the dish is mediocre antenna for these frequencies at best (simple dipole antenna would have gain of around 2dBi but in narrow frequency range). The chart does cover 700MHz band and shows negative gains. Another antenna property, which is not shown but does affect performance, is VSWR ... some antennae don't have bad gain in certain frequency parts, but high VSWR figures make them unfeasible.
The same dish makes a decent antenna in high band (1.7 GHz and higher) and shows that there are actually different varieties of the dish ... selection of LTE modem can not affect antenna gain!
Very interesting. What do you think of it?

http://www.l-com.com/tabbeditem_mobi.aspx?id=50678

Regards.
You do not have the required permissions to view the files attached to this post.
If you want to know my network, you can find it here.

Image
 
RogerWilco
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Re: Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Mon Jul 22, 2019 3:23 am


Very interesting. What do you think of it?

http://www.l-com.com/tabbeditem_mobi.aspx?id=50678

Regards.
Not a lot. If it is similar to this antenna which I've already got. It may be my location, but the antenna is quite useless.
https://www.telcoantennas.com.au/telco- ... 0-2700-mhz
 
RogerWilco
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Re: Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Mon Jul 22, 2019 3:26 am

The PDF linked in previous post shows gain pattern in the bottom two charts. The left chart shows gain as function of frequency in low frequency bands and prooves that the dish is mediocre antenna for these frequencies at best (simple dipole antenna would have gain of around 2dBi but in narrow frequency range). The chart does cover 700MHz band and shows negative gains. Another antenna property, which is not shown but does affect performance, is VSWR ... some antennae don't have bad gain in certain frequency parts, but high VSWR figures make them unfeasible.
The same dish makes a decent antenna in high band (1.7 GHz and higher) and shows that there are actually different varieties of the dish ... selection of LTE modem can not affect antenna gain!
I'm not to knowledgeable when it comes to antennas. The negative gain... this is usually in relation to something?
 
mkx
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Re: Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Mon Jul 22, 2019 7:09 pm

I'm not to knowledgeable when it comes to antennas. The negative gain... this is usually in relation to something?
In short: yes, this is relative figure - imaginnary truly omni-directional antenna would have gain of 0dBi). Higher the number, better signal. The most ordinary dipole antennae have gain of around 1dBi, antennae built into smart phones feature similar gain. Bigger ugly looking antennae (for fixed installations, such as fixed broadband or on cell towers) have gains up to 18 or 20 dBi (for that gain @800MHz, an X-pol antenna is almost 3m high). Dishes go up to 40-50 dBi. Any antenna with less than 0 (i.e. negative gain) is best when mounted in pile of trash.

For longer story check wikipedia article.
BR,
Metod
 
RogerWilco
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Re: Mikrotik RBSXTR (No Modem) 9dBi 60 degree LTE Antenna

Tue Jul 23, 2019 2:56 am

Cheers mkx!

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