Download |WORK| Antenna Point
Violet Midkiff
Our mapping tool will allow you to view the TV transmitters in your area. Using this tool, you will see the radius patterns showing the distance of coverage between your location and the broadcast towers. The towers are shown by black markers on the map, and you can click on each tower to see the affiliate, band, latitude, longitude, and heading for each transmitter. Certain variables unrelated to the antennas performance can affect reception, such as terrain, tall buildings, and trees. Call our Connection Crew or chat with us online if you need assistance with choosing the best TV antenna for your location.
The radius is only for when you want to enter a sloped antenna height, it has nothing to do with antenna calibration. The 134mm distance to the phase center of the antenna is what you have to consider.!antenna648505 30.5 KB
I am working with some GPS points that were collected in Field Maps using a high-accuracy GPS receiver. I need to know if the antenna height setting gets applied (subtracted from) to the altitude values in the metadata for the GPS points.
If that is the case for lat/long, wouldn't the altitude values also be directly from the receiver? If the antenna height does get subtracted, then I may have unnecessarily subtracted an additional 2 meters from my GPS points altitude values.
Hi @AidanWilliams1 , antenna height values entered in the Provider settings are subtracted from the "altitude" value in the metadata (as well as the value shown in the GPS details in the map). An simple way to check this is, with no antenna height added, collect a point and note the altitude value; then go back and change antenna height to a large value (like 100m) and collect another feature.
This 15dBi WiFi antenna is a powerful booster parabolic antenna that works best for point to point applications over a long distance. We found it provided a longer range signal than similar gain Yagi type antennas because has a narrower beam width (16 horizontal/21 vertical). This helps reduce or prevent interference from other neighborhood WiFi equipment. With permission it can be used as an directional extender to share an existing wireless service with a neighbor.
The antenna is made of precision cast aluminum alloy and is protected with a durable powder coat finish. The design presents has low wind resistance. The antenna works best with a clear line of sight, especially at long distances. Included: Stainless steel "U" bolts for pole mount with. Size: 11.8" x 15.75", assembly required. N Female connector. This antenna is part of our CC Vector Extended Long Range WiFi Repeater System, and recommended for our WiFi Bridge system and our other Custom WiFi systems.
More access points spread across the house will always outperform a single central access point. Unless the antenna design of the spread-out access points is complete garbage, but this does not describe the WAX220 (a $200 device from NETGEAR's business line).
The visible size of the antennas does not imply their actually size, once stripped off the plastic surrounding it (e.g. the antennas inside the TP-Link TL-WDR4300 are just under half as long as their plastic sleeves make you believe). Beyond that obvious aspect, the mere size of the antennas does not imply how good they are, there are devices with internal antennas that easily beat most devices with external ones.
We have done a CC1310 design that uses the miniature helical antenna from DN038 and I am really struggling to get it tuned properly at 916MHz. I have followed AN058 to set up my board for measuring using a semi-rigid coax cable. I have calibrated my VNA (Keysight FieldFox) to move the point of reference to the end of the semi-rigid coax. The measurements look great with the open, short, and 50 ohm resistive load.
When I move to my board, I take the initial measurement using a 0 ohm series resistor to connect the antenna and get a value around 65 - j270 ohms @916MHz. I use some software to come up with some theoretical matches and when I start by adding a parallel 0.1pF capacitor the impedance change makes sense (49.5 - j237 ohms @916MHz). When I swap the 0 ohm series resistor for a 39nH inductor the impedance change makes no sense (1.1 + j85 ohms @916MHz).... In fact if I remove the parallel component the impedance with just the series inductor makes no sense. It doesn't really matter what capacitance or inductance value I use for the series component, the measurement never makes sense.
I tried a different cable and re-calibrating with no luck. I have tried a sanity check by measuring the impedance of the meandering monopole antenna on the LaunchXL-CC1310 and I am not sure that is making any sense either. I measured a starting impedance of 13.9 + j89 ohms @916MHz on the LaunchXL-CC1310 (R12 = 0 ohms). That impedance changed to 22 + j59 ohms @916MHz when I changed R12 to 2.2pF.
The dBi value expresses the amount of gain an antenna has with respect to 0 dBi. This can range from roughly 2.2 to 4 dBi for an omnidirectional dipole antenna, up to perhaps 7 or 8 dBi for patch antennas, and perhaps up to 15 dBi for more directional sector antennas. Note that the gain values are given per band, because gain is usually different for 2.4GHz vs. 5GHz signals.
The Meraki outdoor ANT-20 is a dual-band omnidirectional antenna that appears cylindrical, supports both 2.4 and 5GHz bands, with a signal that radiates evenly in a 360-degree horizontal pattern around the antenna. These antennas are typically used on APs for client association due to the evenly distributed signal pattern.
All current outdoor antenna models, except the AIR-ANT2513P4M-N= (Cisco stadium antenna), are supported by all current outdoor MR access points. Please refer to our datasheet library for more information, as well as for legacy MR access points and antennas.
The Cisco Four-Port Dual-Band Polarization-Diverse Array stadium antenna (AIR-ANT2513P4M-N=) is certified and supported for use with MR84 and MR86 access points. This is common for stadium deployments.
Indoor MR access points, such as MR20, MR28, MR36, MR46, and MR56/57, as well as the CW916x-MR models, do not support the use of external antennas, and instead have integrated omnidirectional antennas. Likewise, the outdoor MR70 and MR78 access point have integrated omnidirectional antennas and do not support external antennas.
* The E6 wide patch antenna may work equally well for higher ceilings over 25 feet (8 meters) in lower client density deployments, as well as mounting up to 25 feet (8 meters) in higher density deployments. It is always recommended to conduct a proper site survey to determine ideal antenna type, placement, mounting height and angle.
Note: Despite the names of the E6 being "wide patch" and F6 being "narrow patch" be aware this refers to the coverage. The E6 has a 60-degree half-power beamwidth cone of coverage, while the F6 has a 30-degree half-power beamwidth cone of coverage. Wide and narrow does not refer in any way to the dimensions of the antennas. The F6 narrow patch is significantly larger (more than double the length and width) than the E6 wide patch. Please refer to the dimensions and weight table below.
No. In certain use cases, you may have one radio of a 2x2 access point disabled, for example the 2.4GHz radio on an MR76 might be off/unused, and therefore the two 2.4GHz antenna ports might not have antennas connected. (See next question below.) Those antenna ports should still be covered with weatherproof caps. It is required to cover all unused connectors on an outdoor AP to prevent damage that would void the unit's warranty.
It depends. In some outdoor cases, with a 2x2:2 access point like the MR74 and MR76, they have band-specific antenna ports, two for 2.4GHz on the top of the AP and two 5GHz ports on the bottom of the AP, and they are labeled as such. There may be certain designs or reasons to have one radio disabled. In that case, for example if the 2.4GHz radio is disabled, then you would not have any antenna(s) connected to the 2.4GHz antenna ports. And in that scenario, you should still have those ports properly covered (see previous question above).
On a 4x4:4 AP however such as the MR84 and MR86, there should be no unused ports. These APs have four dual-band antenna ports (and therefore do not have 2.4 or 5GHz labels). None of these ports should be left unconnected because all four ports will always be active even if one radio is disabled. MR84/86 APs should have all four antenna ports connected, and with the same type of antennas with the same orientation.
The model of the antenna denotes whether it should be connected to the 2.4GHz or 5GHz mount points, or if it supports both. Supported bands are also color coded on the antenna's base, where green denotes 2.4GHz support, blue denotes 5GHz support, and both green+blue indicates that the antenna is dual-band.
It depends. On 2x2:2 outdoor access points, such as MR74/76, there are use cases for mixing antenna types, such as when creating a mesh link. For example, there might be a distant outdoor area that needs client coverage. An MR76 mesh AP can be deployed with ANT-20 omni antennas on the 2.4GHz ports to serve clients in the area around the access point, while an ANT-27 sector antenna can be connected to the 5GHz ports of the MR76 and aimed back at a gateway AP on the building to create a 5GHz backhaul mesh link.
On 4x4:4 outdoor access points, such as MR84 and MR86, all four antenna ports are dual-band and diplexed to both radios. On these APs, all antennas should be identical and have the same orientation. Do not mix omni and patch antennas or patch and sector antennas, for example, on 4x4:4 access points.
In this series of images below, there are different combinations of ANT-20 (omni), ANT-25 (patch) and ANT-27 (sector) connected to MR76 and MR86. Looking closely, you may notice some of the directional antennas aimed in different directions.
On a 4x4:4 access point, such as MR84/86, all antennas should be the same type and have the same orientation. If, for example, there is an MR86 with two ANT-25 patch antennas connected, do not attempt to aim each antenna in different directions in order to increase the coverage area. This will send two spatial streams in one direction and two spatial streams in another direction and will have unintended consequences.
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