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MUM Europe 2020

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by ndor
Sun May 13, 2018 5:24 pm
Forum: RouterBOARD hardware
Topic: 3x3 MIMO antennas >20dBi
Replies: 19
Views: 2080

Re: 3x3 MIMO antennas >20dBi

This is a badly based experiment, the construction based only on some images, without any technical detail . On the other hand, there is absolutely no connection that MIMO 3x3 is exclusively for indoor. On the contrary, an oudoor link is much more feasible because there are two identical equipments....
by ndor
Sun May 13, 2018 12:04 pm
Forum: RouterBOARD hardware
Topic: 3x3 MIMO antennas >20dBi
Replies: 19
Views: 2080

Re: 3x3 MIMO antennas >20dBi

Seriously !! Understand that you used this type of feeder.
Or do you just give it your opinion about what you see in a picture?
How did you find that there are no phase differences between the connectors?
by ndor
Sat May 12, 2018 9:28 am
Forum: RouterBOARD hardware
Topic: 3x3 MIMO antennas >20dBi
Replies: 19
Views: 2080

Re: 3x3 MIMO antennas >20dBi

For 30 dBi you should look for a parabolic offset or prime focus feeder.
Something like that
http://antenewireless.ro/index.php?rout ... uct_id=377
by ndor
Wed Feb 21, 2018 9:34 am
Forum: Wireless Networking
Topic: dual-polarization, recommendation
Replies: 1
Views: 414

Re: dual-polarization, recommendation

If you refer to isolation between polarizations, you can not calculate it, measure it.
The minimum acceptable is -20dB.
If you refer to isolation between two antennas, there is no standard, the higher, the better.
by ndor
Wed Feb 07, 2018 10:10 am
Forum: Wireless Networking
Topic: 60GHz multipoint, share your experience
Replies: 36
Views: 13403

Re: 60GHz multipoint, share your experience

In the movie I see nothing but a laptop on a field.
How much does the land cost in the area? I suspect you sell land, not equipment.
by ndor
Sun Jan 21, 2018 9:45 am
Forum: Wireless Networking
Topic: wAP 60G experience
Replies: 292
Views: 44206

Re: wAP 60G experience

Some pictures with the product , we can see ?
by ndor
Tue Nov 07, 2017 8:42 pm
Forum: Wireless Networking
Topic: Dish
Replies: 4
Views: 537

Re: Dish

Because wireless it is bi-directional communication , and antenna have the same gain in tx like in rx .
That means you have better reception with big antenna than small antenna.
by ndor
Mon Oct 30, 2017 8:24 pm
Forum: Wireless Networking
Topic: Combining two radios into one antenna
Replies: 27
Views: 2521

Re: Combining two radios into one antenna

scampbell: your idea is not working because that is a low band (2.4G) and hi band (5G) filter inside. Ndor: yes, i can be done with bandpass filter - but that would really limit the usage. For example: radio port1 filtered to 5500-5650 radio port2 filtered to 5750-5900 Again: Mimosa connect 2 radio...
by ndor
Fri Oct 20, 2017 9:33 am
Forum: Wireless Networking
Topic: Combining two radios into one antenna
Replies: 27
Views: 2521

Re: Combining two radios into one antenna

Yes , it is possible if you use a duplexer and additional bandpass filters .In fact the same setup is also used in the professional equipment .
by ndor
Sun Jun 25, 2017 9:19 am
Forum: Wireless Networking
Topic: LDF 5 using a satellite dish
Replies: 4
Views: 1157

Re: LDF 5 using a satellite dish

1. No. And you can not fit both devices in the antenna focus .
2. Yes.......the signal go to the sky , if you don't redirect the dish on the desired direction .
by ndor
Mon Apr 10, 2017 8:58 pm
Forum: Wireless Networking
Topic: The radiation patterns for some boards
Replies: 17
Views: 3982

Re: The radiation patterns for some boards

mANT19 is an sector antenna with an opening of 120 degrees .
This radiation pattern is too narrow .
by ndor
Thu Aug 18, 2016 7:14 pm
Forum: Wireless Networking
Topic: Question about short link with SXT Lite 5
Replies: 8
Views: 1142

Re: Question about short link with SXT Lite 5

According to the calculation of the Fresnel zone , for the distance and frequency of the question , must install at least 2 m height in relation to the highest obstacle .
- http://www.proxim.com/products/knowledg ... -zone#feet
by ndor
Tue Aug 16, 2016 7:49 pm
Forum: Wireless Networking
Topic: NetMetal antenna configuration - V-V vs. H-V
Replies: 10
Views: 1613

Re: NetMetal antenna configuration - V-V vs. H-V

To combine antennas with the same polarization has nothing to do with the spatial diversity . No more than it can be said that the system will become SISO . The advantage would be that it will be a single polarization , less interference , an area covered more widely . The spatial diversity has noth...
by ndor
Tue Aug 16, 2016 4:00 pm
Forum: Wireless Networking
Topic: NetMetal antenna configuration - V-V vs. H-V
Replies: 10
Views: 1613

Re: NetMetal antenna configuration - V-V vs. H-V

Yes, you can use how many antennas you like, with the same polarization . It will work very well .
You can use power divider 2: 1 to mount two antennas on the same connector .
Total 6 antennas !!
by ndor
Mon Apr 11, 2016 2:54 pm
Forum: Wireless Networking
Topic: Microstrip (flat panel) versus eliptical (disk) antenas?
Replies: 24
Views: 2556

Re: Microstrip (flat panel) versus eliptical (disk) antenas?

Using a metal tube, you will create a waveguide .At that diameter and a frequency between 5-6 Ghz you will not get anything at the other end . Or ,if you have a signal, it will be very bad . See waveguide transmission line theory On the other hand, if use a metal tube with finite lenght , you will n...
by ndor
Sun Mar 06, 2016 6:51 pm
Forum: RouterBOARD hardware
Topic: Need advice to cover 20km wifi
Replies: 20
Views: 2209

Re: Need advice to cover 20km wifi

I think you have no idea how it works in wireless , data transmission. A mobile client is not the same as a stand alone client. I'll give you two small clues: 1 - Antennas between AP and client need to see one another without obstacles. 2 - A mobile client that connects to the AP with a phone, table...
by ndor
Sun Nov 22, 2015 9:30 am
Forum: RouterBOARD hardware
Topic: SXT 2 Transmit power
Replies: 4
Views: 1239

Re: SXT 2 Transmit power

Yes, total are about 15 w
by ndor
Fri Sep 04, 2015 5:10 pm
Forum: Wireless Networking
Topic: Problem with 3x3 MIMO Antennas and Netmetal
Replies: 19
Views: 5164

Re: Problem with 3x3 MIMO Antennas and Netmetal

Yes, there are manufacturers who use systems with 27 antennas and more/ channel in the same polarization. Ruckus, Xirrus ... etc, but talk of a totally different technology (beamforming) and a different destination p2mp. .... I do not want to comment remainder posting. All I wanted to say was, that ...
by ndor
Fri Sep 04, 2015 11:21 am
Forum: Wireless Networking
Topic: Problem with 3x3 MIMO Antennas and Netmetal
Replies: 19
Views: 5164

Re: Problem with 3x3 MIMO Antennas and Netmetal

Quadrature directional coupler or hybride directional coupler , same thing , are passive devices . In the link below you can see an example in Figure 21 how can also be used a combination of such devices. With a little imagination you can get an idea of what I explained above . - https://en.wikipedi...
by ndor
Thu Sep 03, 2015 6:47 pm
Forum: Wireless Networking
Topic: Problem with 3x3 MIMO Antennas and Netmetal
Replies: 19
Views: 5164

Re: Problem with 3x3 MIMO Antennas and Netmetal

In my opinion using a slant polarization for a 3x3 system is a mistake. Slant polarization is not recommended for use in combination with polarization H and V .Insulation due to very small differences from the other two. Only -3 dB against each of them. Usually,singular slant polarization is used in...
by ndor
Wed Apr 29, 2015 9:06 am
Forum: RouterBOARD hardware
Topic: FYI: Photo of RB922 + R11e + enclosure StationBox InSpot
Replies: 25
Views: 6740

Re: FYI: Photo of RB922 + R11e + enclosure StationBox InSpot

I also don't understand how RF Elements can specify that the antennas are vertically polarized to be honest as they are running parallel to the floor. First, you must understand what they mean polarization. It is the electromagnetic wave polarization that has no connection with how the antenna is p...
by ndor
Fri Mar 06, 2015 2:40 pm
Forum: Wireless Networking
Topic: 5.5-6.5GHz Dish Antenna
Replies: 9
Views: 1735

Re: 5.5-6.5GHz Dish Antenna

Jirous , in my opinion , is the best on the market.
http://en.jirous.com/antenna-5ghz-parabolic
by ndor
Sat Feb 28, 2015 1:02 pm
Forum: Wireless Networking
Topic: Mounting 2 Omni antenna on mast
Replies: 4
Views: 1003

Re: Mounting 2 Omni antenna on mast

In theory no matter who is above and who is below.
In practice I would suggest that 5.8 ghz antenna to be placed on top.
Of course this is also depending on their radiation in the vertical plane and each antenna gain,
by ndor
Tue Feb 24, 2015 3:04 pm
Forum: Wireless Networking
Topic: RF Element's "Symmetrical Antennas"
Replies: 20
Views: 4406

Re: RF Element's "Symmetrical Antennas"

But bigger openin in antenna means not only bigger coverage, but bigger noise to!
At this point I agree with you
by ndor
Tue Feb 24, 2015 1:42 pm
Forum: Wireless Networking
Topic: RF Element's "Symmetrical Antennas"
Replies: 20
Views: 4406

Re: RF Element's "Symmetrical Antennas"

Yes it is a waveguide with a corrugated horn. This type of horn antenna has a radiation that looks like this and is especially suitable for point to point links horn_directivity.JPG An antenna sector radiation should look like this: sectoral horn patern_1.JPG As shown vertical radiation is greatly a...
by ndor
Tue Feb 24, 2015 9:24 am
Forum: Wireless Networking
Topic: RF Element's "Symmetrical Antennas"
Replies: 20
Views: 4406

Re: RF Element's "Symmetrical Antennas"

In fact it is nothing but a horn antenna. I do not understand why someone would at this sector to radiate equally in both planes. That would mean that interfere strongly with other antennas located above and below this type of antenna I'd be really curious to see how they can get more than -53dB sep...
by ndor
Mon Feb 23, 2015 9:55 am
Forum: RouterBOARD hardware
Topic: Advice requested: Antenna selection for dual-band BaseBox
Replies: 1
Views: 717

Re: Advice requested: Antenna selection for dual-band BaseBox

I guess you want to mount one RB on each floor. Otherwise I do not see how you could have good coverage with omni antennas in 4 floors.
In this case no matter what distance are antennas to one another.
by ndor
Tue Feb 10, 2015 9:48 am
Forum: RouterBOARD hardware
Topic: RB953GS 3 antenna connection
Replies: 1
Views: 424

Re: RB953GS 3 antenna connection

Yes, you can. Works very well
by ndor
Thu Dec 18, 2014 10:18 pm
Forum: Wireless Networking
Topic: Minimum spacing between omnidirectionnal antenna
Replies: 6
Views: 1401

Re: Minimum spacing between omnidirectionnal antenna

No matter the distance. Both antennas are mounted on the same equipment so they will work synchronously. And there will be not interference between them.
by ndor
Fri Oct 17, 2014 10:06 am
Forum: RouterBOARD hardware
Topic: Use 3x3 mimo radio W/ 3 directionals to improve coverage?
Replies: 5
Views: 1289

Re: Use 3x3 mimo radio W/ 3 directionals to improve coverage

Yes, you can do this. You can put three antennas on a RB953GS oriented in different directions.
by ndor
Mon Sep 22, 2014 5:32 pm
Forum: Wireless Networking
Topic: About 100/Users per device
Replies: 11
Views: 3485

Re: About 100/Users per device

I think he would need something from Xirrus. Something XR-6000 Series
They say that can support up to 3000 simultaneous users on an AP
http://www.xirrus.com/Products/Wireless ... es-%281%29
by ndor
Mon Jul 22, 2013 9:11 am
Forum: RouterBOARD hardware
Topic: SEXTANT G 5HnD+AirFiber Troughput Test (620+ Mbps) Wooow !!!
Replies: 4
Views: 3119

Re: SEXTANT G 5HnD+AirFiber Troughput Test (620+ Mbps) Wooow

And where is sextant g 5hnd in this equation ?
by ndor
Wed Jun 12, 2013 1:35 pm
Forum: Wireless Networking
Topic: Noise Floor
Replies: 7
Views: 6315

Re: Noise Floor

For noise,yes.for signal,no
by ndor
Sun Jan 22, 2012 8:42 pm
Forum: Wireless Networking
Topic: buy dual or tri pol feed horn?
Replies: 3
Views: 873

Re: buy dual or tri pol feed horn?