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  1. Yesterday
  2. mam taky pocit ze nieco robim zle v nastaveniach.. ako som pisal jedine kanaly 5600 a 5700 su pouzitelne.. radia su v stopercentom stave tak neviem
  3. Last week
  4. 3db Horizontal Beamwidth

    0 (zero) is bore sight axis. elevation beam width at -6dB is 30 degrees and that is correct - added green lines and approximate -6dB mark on dB axis for easier understanding. It is the angle between the two green straight lines going out of center of the graph (= 30°) elevation beam width at -15dB is 60 degrees and that is also correct - It is the angle between the two blue lines. if you look at it from zero / bore sight, it is +30° to -30° in elevation (so the beam width is 60 degrees
  5. 3db Horizontal Beamwidth

    According to the spec sheet for the 30 degree horn, the elevation beamwidth is -6db at 30 degrees. But, the drawing/graph shows -15db at 30 degrees. So, which is it? These two seem to contradict each other. John Rayfield, Jr.
  6. 3db Horizontal Beamwidth

    John – be aware, there is a lot of BS told on Fb, forums and everywhere else by some manufacturers and "power users" and it is heavily misleading the customers. You can read the information you are asking us either from published graphs or from radiation properties files. But there are some "IF"s A - Graphs Graphs are good and easy source if i) graphs are true interpretation of the product ii) they are published in usable format (vector) and iii) user is capable of correct interpretation of the graphs. One must understand, graphs are two dimensional representation of three dimensional radiation pattern. You only can tell so little about the antenna radiation properties by using the graphs.. That is obvious limitation of the format. Patch array antennas have tons of side lobes, but when speaking about radiation properties of patch array antennas, they miraculously "disappear". Everybody – antenna manufacturers in first case - pretend that side lobes are not there (or that they are, if it helps the case, such as null fill). But with this antenna type, side lobes are present all the time. So when you are concerned about where is the patch array antenna radiating @-15 db from max (or bore sight) gain, you have to count with side lobes. I bet that 999 out of 1000 users only consider main radiation lobe, which is of course pretty narrow in elevation beam width. Add the side lobes and everything looks way different. Example here is the comparison of the elevation patterns of two antennas, KP performance sector for Mimosa and RF elements 30° Symmetrical Horn (both original pdf data sheet attached). The situation with Symmetrical horn is quite easy to read: at 30° up or 30° down, you are about -15 dB down from bore sight (max) gain. Any degree further, and gain goes steep down hill. The same works for azimuth pattern, as the antenna has circular beam shape (hence the name "Symmetrical") Now take a look on patch array - one can be easily fooled by an argument that "patch array is only about 7° beam width in elevation", so applying some logical deduction, 30° off bore sight (or 26.5° off that beam width) in elevation pane, either UP or DOWN, one must be god damn safe and the gain must be decreased by a huge portion. Is it? NOT AT ALL. 30° UP OR DOWN from the bore sight on elevation, you still have antenna radiating equal to or stronger than -15 dB from max gain. The reason: side lobes. Graphs are also easy to cheat with using certain exponential scale that can effectively “mask” the side lobes, etc. Therefor data files may appear as more reliable source - “numbers do not lie” - but again, there are some “IF”s. B – Antenna files Now, if you want to use the data that describe the radiation properties: Manufacturers often publish data for certain frequency (often middle of the working band) and let´s say one cut through the 3-D picture. Say this is not the issue if antenna have radiation properties that do not vary with frequency within the working band and are somehow predictable from such a limited information - which exactly is the case of Symmetrical Horns. But it is not the case of the majority of patch array antennas! Just take a look on printed 3-D radiation pattern of typical patch array sector antenna (and that is a not a bad one). They are more complex in real than they appear in graphs or when considering most of antenna files. What manufacturers and users often ignore on patch arrays and also on other relevant antenna types - if for a reason or not – are again the side lobes. On Symmetrical Horns, side lobes are zero issue, but on other antenna types they are completely opposite. Some manufacturers include the data that describe the main radiation lobe AND also side lobes into antenna radiation files, but some do not! When using antenna files, You should check how exact and true representation of the real radiation pattern those files are. If they are not exact, not complete or manipulated (too good to be true), you are creating model that is not in line with reality, and – what is more important – you are going to make wrong decisions. As a result in this particular comparison, and just to complete the example case, patch array does not provide you more narrow vertical beam radiation with respect to your goal, despite its main lobe is pretty narrow. 30°Symmetrical horn provides slightly better results for -15 dB beam width, but it also provides way better coverage pattern within given beam width (graphs speak themselves). You can tilt Horn +/- 25°, while I assume KP and other patch array antennas can do maybe half of 25° and only down-tilt. So you even are not able to mitigate effect of those side lobes by tilting the antenna – not only the tilt will not be sufficient, but the resulting coverage pattern will be quite a mess. The judgement on which antenna is better depends on what job needs to be done, therefor I will not make statements which of the two is better, and it was not the point of this post. (Just in case - ours are the best ). Maybe you are familiar with all things written above and that is good - thanks for reading it till the end. If it was new info for you, I hope it helps. Datasheet-Symmetrical-Horn-SH-TP-5-30-2.pdf kppa-5ghzhv4p65s-17_v3_longer_datasheet.pdf
  7. Our Carrier Class Sectors have an integrated backshield so you can mount them much closer than various other competitor sectors. But I would not recommend putting them closer than about 1 meter from each other.
  8. I want to cover 180 degrees with 2 antenas and i use them in different channels, but they are installed together at the same height...
  9. It depends: do you want to use them on the same channel? Do you want to use a different channels and cover the same area?
  10. I just have 2 secc214 together on the same tower, i need to separate each other?
  11. @xe3luf: OK, so you can try 3 degree downtilt.
  12. Registration: https://www.rfelements.com/support/webinars/aumento-de-ancho-de-banda/
  13. @xe3luf - what would be the height of your tower for this installation, please?
  14. Registration: https://www.rfelements.com/support/webinars/rechazo-de-ruido/
  15. 3db Horizontal Beamwidth

    @John Rayfield - please, take a look at our ANT files: https://www.rfelements.com/products/wireless-broadband/symmetrical-horn-antennas/download/antenna-files. Plus here is the explanatory that will help you to find the spot you are trying to identify for any given antenna: https://goo.gl/Xx4xWp.
  16. 3db Horizontal Beamwidth

    My understanding is that if your horns are used on Access Points here in the U.S., in the U-NII 1 spectrum, then we have to be concerned with the EIRP an elevation angle of 30 deg above the horizon (or higher). Any signal above 30 degrees above the horizon must be no stronger than 125 mw. From maximum legal EIRP of 4 watts, this would be about 15 db down from maximum gain. It seem that we would need to downtilt the horns somewhat, to keep within this requirement. But, I'm not sure how much we would need to downtilt for the various models. Can you give me an idea as to the elevation angle for each model of the horn antennas, where the signal level would be down by 15 db from maximum gain? John Rayfield, Jr.
  17. Ak nedokazete manualne nastavit nejaky parameter na radiu, ide s najvacsou pravdepodobnostou o problem s fw konkretneho radia, s tym vam bohuzial nevieme pomoct.
  18. jedinym vhodnym kanalom bolo 5600 a 5700.. akykolvek iny kanal ked nastavim, neviem nastavit maximalny vystupny vykon.. neviem co robim zle. ale ako ste pisali na rocketoch pouzivam starsiu verziu airos 5.6.4. dufam ze to nebude problem
  19. Earlier
  20. 3db Horizontal Beamwidth

    @John Rayfield- It would be great if you could ask them to do so
  21. 3db Horizontal Beamwidth

    I missed that in the spec sheets. Excellent. Just what I need to know. Now, if Mimosa will just put your 'horns' back in their online design system, I'll have everything I need. John
  22. 3db Horizontal Beamwidth

    @John Rayfield- The horizontal beam is exactly the same as the Vertical beam, so the 30deg horn has a 21* V and H beam at -3. The 40 has a 27* V and H beam at -3. The 50 has a 33* V and H beam at -3. You can find all these in our spec sheets. See here:https://www.rfelements.com/products/wireless-broadband/symmetrical-horn-antennas/symmetrical-horn-tp-antenna/ Go to the bottom of the page.
  23. 3db Horizontal Beamwidth

    Can someone tell me what the horizontal beamwidth at 3b down, for the 30 degree, 40 degree, 50 degree and 60 degree horn antennas? John Rayfield, Jr.
  24. Watch our "Multiple CPE" video tutorial and learn how to use our free Link Calculator for RF elements Symmetrical Horn antennas. Pick your AP and CPEs settings that will fit your needs and get the stats for your potential link immediately.
  25. za malo nepovolenym pasmam sa vyhybajte (obchadza sa to o.i. aj starsimi verziami fw), lebo dodrziavanie vseobecneho povolenia zvyknu kontrolovat a dodrziavanie pravidiel prave tu nejaky zmysel ma. Nase anteny funguju v neobvykle sirokom pasme, ale treba brat do uvahy, ze my ich predavame aj v krajinach kde je to dolne pasmo povolene (napr. USA), alebo v krajinach kde je mozne pouzivat aj pasma nad 5.8GHz (napr. Rusko).
  26. dakujem za Vasu odpoved
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