Diversity antennas

Similar Questions

• 1230AG Omni antenna.

  Can I use two Omni directional ceiling mount AIR-ANT1728 for a 1230AG Aironet (AIR-AP1232AG-A-K9) if so, when and how?

  THANX

  HASSAN

  Hi Hassan,.

  You can use two 1728 antennas in Diversity mode but is not to cover two different cells/regions. For most installations, if you just use a 1728 antenna connected to the Right-hand/primary, RP - TNC connector you should be good, if you have obstacles in the area of cell, you can try to use Diversity (antennas 2 x 1728) mode;

  Cisco Aironet High Gain Antenna omnidirectional ceiling (AIR-ANT1728)

  This doc.

  http://www.Cisco.com/en/us/products/HW/wireless/ps469/prod_installation_guide09186a0080286064.html

  When you use a pair of antennas with characteristics corresponding to ensure diversity cellular coverage in your establishment, the guideline is to put these corresponding antennas at one distance independently of the other which is equal to a multiple of the wavelength of the frequency that is passed. The 2.4 GHz wavelength is about 4,92 inches. Therefore, in order to support diversity on a radio of 2.4 GHz with two separate antennas, the antennas must be sufficiently spaced about 5 inches apart. The pair of antenna could also be spaced at multiples of 5 inches, but the distance between the two may not exceed 4 multiples: reflects the waves more far outside that are likely to be so distorted and different late spread that the radio could not work with them. Because each antenna is chosen by himself, both antennas should have the same characteristics of radiation and be placed to provide similar cellular coverage. Two antennas connected to the same access point should not be used to cover the two different cells.* *.

  The good doc.

  Multipath and diversity

  http://www.Cisco.com/en/us/Tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml

  I hope this helps!

  SoC

  Remember messages useful rate...

• Newbie on antenna question

  Hi, I got a 2 x 4402 WLC and 25 x 1242AG TOWER to deploy. None of the ROUND came with the antenna. They are to be deployed in an office environment. The absence of antenna would prevent me from editing above the suspended ceiling, or must they go on the inner walls instead? I could not do a poll on the site but as it is still a construction site.

  Hi Brian,.

  You know, I don't think that there is no 1242 with antennas :(

  «The Cisco Aironet 1240AG series Access Point is a fixed configuration access point, dual band IEEE 802.11a/b/g. built in to the access point are two radio stations, each with * dual diversity antenna connectors.»

  http://www.Cisco.com/en/us/prod/collateral/wireless/ps5678/ps6521/product_data_sheet0900aecd8031c968.html

  You would need something like the series 1130 (with integrated antenna).

  http://www.Cisco.com/en/us/products/HW/wireless/products_category_buyers_guide.html#http :// www.cisco.com/en/US/products/hw/wireless/products_category_buyers_guide.html

  This does not mean you will need external antennas for use with the 1242.

  I hope this helps!

  Rob

• antenna

  Hello

  1240 series access point can instal also rather couple a single antenna?

  Does anyone advice me an a documents on?

  Best regards

  Lorenzo

  Hi Lorenzo,.

  In many deployment scenarios, a "single" antenna will work fine

  Both on the AP RP - TNC connectors is intended not to cover the 2 distinct regions, but rather to give better coverage in one type particular area by configuring the antennas for Diversity.Have a glance;

  To increase coverage, perform a site survey to determine the antenna RF coverage. Access points placed in the appropriate areas of the installation site. Diversity aims to overcome the paths multiple reflections. Diversity antennas, which share the same physical envelope are placed at a distance optimal apart. The manufacturer of the particular antenna determines this distance based on the characteristics of the antenna. When you use a pair of antennas with characteristics corresponding to ensure diversity cellular coverage in your establishment, the guideline is to put these corresponding antennas at one distance independently of the other which is equal to a multiple of the wavelength of the frequency that is passed. The 2.4 GHz wavelength is about 4,92 inches. Therefore, in order to support diversity on a radio of 2.4 GHz with two separate antennas, the antennas must be sufficiently spaced about 5 inches apart. The pair of antenna could also be spaced at multiples of 5 inches, but the distance between the two may not exceed 4 multiples: reflects the waves more far outside that are likely to be so distorted and different late spread that the radio could not work with them.

  This doc.

  Multipath and diversity

  http://www.Cisco.com/en/us/Tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml

  The farther the antennas are separated, the cell of coverage for each antenna is different. If coverage cells become too different, the client node or at the end may experience signal loss and a poor performance. An example of different coverage cells would be a directional antenna on a single antenna with an omnidirectional antenna port or higher gain on the other port.

  Diversity aims to provide the best possible throughput by reducing the number of packets that are missed or retried.

  If two diversity antennas are installed, Cisco recommends to set up diversity for receiving antenna and antenna pass parameters.

  If only a single antenna is installed, Cisco recommends that you connect it to the right antenna RP - TNC Jack and that you configure (primary) law for receiving antenna and antenna pass parameters.

  See you soon!

  SoC

• Two different antennas on a single point of access

  Hi all

  I know that the two different antennas connected by an access point are not supportet by Cisco.

  Unfortunately I can not find the document where this scenario is described.

  Does anyone know what document describes this solution?

  Thank you

  Martin

  you are correct. It is actually recommended that it makes no sense that he would defeat the purpose of the diversity. If an antenna gain is higher then the other your stronger antenna is probably still favored for tx

  Diversity

  Diversity is the use of two antennas for each radio, to increase the chances that you get a better signal on

  or antennas. Antennas used to provide a solution of diversity may be under the same physical envelope

  either two separate but equal co-located antennas. Diversity provides relief to a wireless network

  network in a scenario of multiple paths. Diversity antennas are physically separated from the radio and the other to

  ensure that we meet less trips with multiple effects of propagation than the other. Double antennas generally to ensure

  that if an antenna is in RF null, while the other is not, which offers better performance in railways

  environments (see Figure 3). You can move the antenna around the null point and provide a means of

  receive the signal correctly.

  http://www.ciscosystems.or.at/application/PDF/paws/27147/multipath.PDF

  hope this helps... Please rate the post if you find it useful

  Thank you

• How to position the dipole antennas

  Our installers have placed at each Access Point and a vertical antenna horizontally to get the best range of coverage. I don't know if this is the best option, because it changes the polarization of the antenna, such antennas must always be placed vertically or if it is better to have at least two in the same position.
  All ideas

  Thank you

  Hello

  I'm going with your assessment that the two antennas must be oriented in the same way

  This investment and the use of two identical antennas are described below;

  This article describes the use of 2 antennas in "Diversity" Mode

  Diversity aims to overcome the paths multiple reflections. Diversity antennas, which share the same physical envelope are placed at a distance optimal apart. The manufacturer of the particular antenna determines this distance based on the characteristics of the antenna. When you use a pair of antennas with characteristics corresponding to ensure diversity cellular coverage in your establishment, the guideline is to put these corresponding antennas at one distance independently of the other which is equal to a multiple of the wavelength of the frequency that is passed. The 2.4 GHz wavelength is about 4,92 inches. Therefore, in order to support diversity on a radio of 2.4 GHz with two separate antennas, the antennas must be sufficiently spaced about 5 inches apart. The pair of antenna could also be spaced at multiples of 5 inches, but the distance between the two may not exceed 4 multiples: reflects the waves more far outside that are likely to be so distorted and different late spread that the radio could not work with them. Because each antenna is chosen by himself, both antennas should have the same characteristics of radiation and be placed to provide similar cellular coverage. Two antennas connected to the access point cannot be used to cover the two different cells.

  The good doc.

  Multipath and diversity

  http://www.Cisco.com/en/us/Tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml

  "You can relate this to a common phenomenon in your car. While pulling up to the stop, you may notice static on the radio. But as you move a few inches or feet, the station began to more clearly. By rolling forward, you move the antenna slightly, on the point where multiple signals converge.

  A diversity antenna system can be compared to a switch that selects a single antenna or another, never both at the same time. Receive the radio mode continually to switch between antennas tuned for a valid radio package. After hearing the beginning of a valid packet synchronization, the radio will assess the timing signal to the package on a single antenna, then take the other antenna and evaluate. Then the radio will choose the best dish and use only the antenna for the remaining part of the package.

  The transmit, the radio to select the same antenna that he used the last time that he had communicated to this particular radio. If a package fails, it will switch to the other antenna and re-run the package.

  One caveat with diversity, is not designed for the use of two antennas covering two cells of different cover. The problem using it this way is that if the antenna n ° 1 communicates to the device No. 1 during Unit n ° 2 (who is in the cell of the antenna n ° 2) attempts to communicate, no. 2 antenna is not connected (because of the position of the switch), and communication fails. Diversity antennas must cover the surface of only a slightly different location. »

  Of this antenna reference guide;

  http://www.Cisco.com/en/us/products/HW/wireless/ps469/products_data_sheet09186a008008883b.html

  See you soon!

  Rob

• Buysing external antenna is required for AIR-AP1230A & B?

  I just went through the check tool configuration for a Cisco Aironet AP1230A-A-K9 and then for an AP1230B-A-K9. Two checked the config like OK, but had a warning on the antennas of wireless products. I hope that this means that an antenna is optional, but if I buy a dish, the only supported are those listed here:

  http://www.Cisco.com/warp/customer/779/smbiz/wireless/approvals.html

  Is that correct or is buying an external antenna for both mandatory for them to be operational?

  Thank you!

  Take a look at this link: http://www.cisco.com/warp/public/cc/pd/witc/ao1200ap/prodlit/2356_pp.htm

  "Radio 2.4 GHz for 802. 11B and 802.11 g supported a flexible set of Cisco Aironet omnidirectional and directional antennas that can be mounted on the walls.

  ceilings or on poles. 2.4 GHz radio is not equipped with antennas; the antennas must be ordered separately. Note that the Cisco Aironet 1200 series

  access point is certified to work only with the Cisco Aironet antennas. In order to ensure compliance with the regulations, select Cisco Aironet antennas for use with the 1200 Series access point.

  Radio 5 GHz for the 802. 11A has an integrated diversity antenna system. Auxiliary 5 GHz antennas are not necessary and are not available. »

• Cisco 1250 and AIR-ANT5959

  Hi all

  Ordering Guide 1250 Cisco indicates that AIR-ANT5959 can be used for 2.4 radio concert.

  1250 AP provides 3 connectors for dipole antennas but AIR-ANT5959 spec indicates that it comes with 2 BNC connectors. Are that we assume a dipole to stick on the rest connector? If this is the case, how can we identify which is the TX and RX, you can connect the AIR-ANT5959 to the respective radio without the performance impact? Any help much appreciated.

  see you soon,

  Andrée

  Hi Jean Miche,.

  The connectors on the side of the 1250 are the connectors of the transmission. Then, left and right. Way is not to ' receive '.

  So if you want to connect a 2 antenna connectors like the 5959, you need to plug it into the connectors on the left and right (the order is not important).

  Be aware that you lose the ability MIMO antenna being diversity and no MIMO.

  So for the IOS ap, you need to configure "antenna diversity of transmission" and "antenna receive diversity". That will prevent your 11n rate but works perfectly.

  WLC APs can be the same configured in the configuration of the AP WLC. You simply specify what a diversity antenan plugged into left/right only.

  Connecting a different antenna on intermediate connector would be a mistake because 3 antennas is used only in the case of MIMO and you cannot reach with a diversity antenna MIMO + another antenna on the middle connector.

  I hoep this helps, s

  Nicolas

  ===

  Please note the answers that will help you

• The Pavilion Elite HPE475 need an external antenna to a wireless connection?

  I just bought this machine and have had problems with a poor quality since the wireless signal. HP technical team came up with all sorts of different explanations, and I even had to send for the "repair" because one of them think that the wireless card was defective. The last time it's because he needs an antenna.

  Can someone confirm if this machine wireless card requires an antenna to be connected to the two screws Golden at the back of the computer? What is the answer, or just another diversion?

  I was not sent an antenna with the computer, it may be a mistake the part of HP. I can connect to the internet, but usually get that two bars on the signal, while my old computer has always had five bars, as do other computers on the network. The connection keeps dropping out and is extremely slow to load at times.

  Any help would be appreciated.

  Hello

  I suggest that you take a look at what came in the box.

  The low-profile wireless network card should have with an antenna and two cables with connectors from red and blue to differentiate the connection to the wireless card.

  The service center may be assuming that you already know that... All the wireless cards that come with desktop computers have a connected external antenna with cable to the wireless card.

  This image is an example. Some cards equipped with antennas that screw directly on the gold screws. Most 802.11 b/g/n card look like this.

  Please report anything that is on the label with bar code on the back of your PC, except the serial number. The HPE475 is not a complete description of a PC.

  Best regards
  ERICO

• Simulation of antenna MIMO in VSS

  Hello

  I was wondering if there is no provision to simulate a scenario of MIMO antenna space diversity in VSS? Or any form of smart antennas, in fact.

  Thank you!

  VSS includes all the building blocks for the implementation of MIMO TX and RX features. MIMO is actually implemented in the standard libraries that use this method, such as LTE.  There is also an example that comes with the output, MIMO_Channel.emp, which shows how multipath channels may be created to operate in environments of MIMO.

  I hope this helps.

• Adjustment of antennas

  Hello!

  I have an aironet 1242AG access point, 2 x 2, 4 GHz (AIR-ANT5135D-R) and 2 x 5 GHz (AIR-ANT4941) installed antennas. I have the gateway lying on a rack near the ceiling. What is the best position for the antennas? Should they be right vertical or by creating a V shape (between the 2 same frequency)?

  I do not think that to get a big win out of this, but what are the guidelines?

  Thanks a lot for anybodys time!

  Hi Isabelle,.

  In your case "vertical right" would be the way to go. You might not really need two of each unless you are trying to give a cover type diversity. Take a look;

  You can use two antennas in Diversity mode, but not to cover two different cells/regions. For most installations, if you just use an antenna connected to the Right-hand/primary, RP - TNC connector you should be good, if you have obstacles in the area of cell, you can try to use mode Diversity (2 x? Antennas);

  When you use a pair of antennas with characteristics corresponding to ensure diversity cellular coverage in your establishment, the guideline is to put these corresponding antennas at one distance independently of the other which is equal to a multiple of the wavelength of the frequency that is passed. The 2.4 GHz wavelength is about 4,92 inches. Therefore, in order to support diversity on a radio of 2.4 GHz with two separate antennas, the antennas must be sufficiently spaced about 5 inches apart. The pair of antenna could also be spaced at multiples of 5 inches, but the distance between the two may not exceed 4 multiples: reflects the waves more far outside that are likely to be so distorted and different late spread that the radio could not work with them. Because each antenna is chosen by himself, both antennas should have the same characteristics of radiation and be placed to provide similar cellular coverage.

  The good doc.

  Multipath and diversity

  http://www.Cisco.com/en/us/Tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml

  Cisco Aironet 2.4 GHz and 5 GHz antennas and accessories

  http://www.Cisco.com/en/us/products/ps6521/products_data_sheet09186a008022b11b.html

  I hope this helps!

  Rob

• Cisco AP 1242 IOS and antenna

  People just a quick question about Cisco AP 1242... which is the recommended IOS for 1242 to make autonomous AP. in the second place, I received the new AP and to my surprise when I open it I can't find no antenna with it. My question is will it work without antenna then what antenna devrais I buy keeping in mind that I will be making it autonomous Ap with router ADSL heard they have different antennas

  Kindly help

  So why would cisco sell Ap without antenna this is very starnge as per your say it will not work which is very starnge......

  It is not strange.  It's logical.  How do I know what Cisco antenna, as a customer, you want?

  I am setting this AP as autonomus and will hook up with ADSL modem so kindly advise the Antenna's shd i but all four.

  I gave you the part numbers and I gave you the link to the document.  It's now your job to choose the one you want.  A single 1240 to ideally two 2.4 Ghz and two 5.0 Ghz antenna.  Optionally, disable either radios or possibly disable diversity.

• Diversity with many Clients

  Hello

  How diversity works with many Clients. When I understand the right to diversity. then the ap "tunrs on the antenna off" bc signal (mutlipathing) is on the other antenna 'better '. OK, but what does the ap do when there are about 50 clients or assositated for 500 guests at the ap, how diversity in this camouflage? is actually the same for every client access point? While he would have a lot to do =)

  Best regards, Bernhard

  It is not so much a question of "power off" an antenna.

  He is constantly in reception on both and the monitoring of the force and use only the strongest so it's an ongoing process at any time the receiver always has the signal the strongest possible it won't matter how many clients you have as one customer may transmit at a point in time (half duplex system) so at every moment in time the receiver will only receive a signal, the antenna that has the strongest signal

• It is possible, replace the antenna internal wifi iphone 5s?

  My iphone 32 5 s is perfect, like new, but since yesterday the anntenna internal wifi is broken. We can replace it in an apple store?

  I'm sure that the wifi antenna is broken is not a software problem.

• Mac Book Pro, outdoor WiFi antennas work to extend wi - fi range when plugged into USB PORTS

  Outdoor WIFI antennas work if plugged into the USB port on the Mac Book Pro. If they do, those who extend range of transmission and reception wi - fi?

  Sorry, but I've never used an external USB wifi antenna but if you describe your use case a wifi Repeater/Extender can be a good option for you. https://www.repeaterstore.com/pages/WiFi-booster-Repeater-Extender-differences

  If the option is not a Repeater/Extender so will have to wait for someone who has used an external USB antenna down to.