This and more on imrdb.org – The Internet Movie Radio Database. Being a ham radio enthusiast, I couldn’t help but love this clip! Yes, Ponyo yells “Ham” into the microphone at the end of the clip. This entire movie is great and brought to us by the famous Japanese director Hayao Miyazaki.

Manorita Gobind Singh has been a Radio Jockey on HAM radio since 1978.

Overview

The selection and deployment of access point antenna equipment affect network performance and availability. The signal strength or amount of energy radiated from an antenna has to do with antenna type and access point transmit specifications. It is expressed as effective isotropic radiated power (EIRP) and expressed as the sum of access point transmit power plus antenna gain minus cable loss. Cable length will increase signal attenuation or loss and should be minimized. Each antenna type will have a horizontal and vertical beam width specified. The antenna type, gain, cable length, number and mounting is all key to the design. For instance a directional antenna with high gain, no external cable, mounted at proper height will give best performance in an outside deployment with a lot of interference.

The wireless coverage cell on inside deployments can be extended with external antennas that plug into connectors on the access points. Most antennas can be mounted on the ceiling or wall and outside antennas often use a mast to increase height for line of sight.

Effective Isotropic Radiated Power = Transmit Power (dBm) + Gain (dB) – Cable Loss (dB)

Omni-Directional

Omni-directional antenna sends a horizontal radiated pattern of 360 degrees and a vertical pattern of 50 – 70 degrees from its source. From a practical perspective the pattern isn’t circular as much as being elliptical. It is a multi-homing antenna that sends signals to several clients in proximity causing some multipath fading that is minimized with antenna diversity. The gain values with 2.4 GHz antenna range from 2.2 dBi – 12 dBi. The higher gain antenna is deployed outside for the most part. Some Cisco access points have an integrated omni-directional dipole antenna or ” rubber ducky” that is standard with each device.

Directional

The directional antenna sends out a directed radiated pattern connecting with a distant antenna. The antenna purpose is to send traffic between antennas and not used for multi device homing. There are 3 specific directional antennas: Yagi, Patch and Dish. The Dish antenna has highest gain and narrowest radiation angle beam while Patch antenna has lowest gain and widest radiated beam. Gain values with 2.4 GHz antennas range from 6dBi – 21 dBi. Most antenna from this group are implemented in buildings with there is a lot of signal attenuation such as manufacturing, warehouses, and structures with a lot of steel, concrete, angled designs etc.

Diversity 

The diversity antenna implement dual antenna on the access point receiving signals on both. The access point determines what antenna has best gain and transmits on that antenna.  Diversity antennas are designed using either omni-directional, directional or dipole styles. Multipath fading occurs in buildings that have a lot of signal reflection. The signal finds multiple paths from source to destination and signal becomes distorted at receiver. This is minimized or eliminated with diversity antennas. 

External Antenna

Some Cisco access points such as 1200 series have connectors available for an external antenna. This is available with deployments in environments where the access point is at a maximum 300 feet from the wired switch or signal distortion is excessive. The external antenna with a specified coax cable of 3 – 100 feet allow for placement of the antenna at optimal positioning. Minimizing the cable length will decrease signal attenuation before transmission. Implementing the higher gain diversity patch antenna fixes the problem of clients being out of range. The company could have deployed a repeater as an alternative solution with an 1100 series access point that doesn’t support an external antenna.

Building material and structural design will contribute to signal attenuation. The following describes from best to worst building material used with walls, floors and ceilings. Steel and concrete with several feet of construction is most difficult.

• Wood

• Concrete

• Reinforced Concrete   

• Steel

Antenna Mounting

Access points should be ceiling mounted if possible at least 17 – 19 feet in height optimizing horizontal and vertical beam width. In some cases the access points will have to be mounted on the wall. Antenna mounting is important and should be implemented with instructions from the hardware installation guide. The Cisco access points utilize the standard RP-TNC 50 ohm type connector.

Directional Antennas also acknowledged as beam antennas can assist in focusing the energy in a particular direction which in return can help in trouncing fading and multipath, but multipath on its own diminishes the focusing power of a directional antenna. Directional antennas which are used indoors normally have a subordinate gain; with the result they contain lower front-to-back and front-to-side lobe ratios. All this results in inferior capability to discard or reduce the meddling signals received from directions outside the primary lobe area.

Most of the Directional Antennas functions occur by concentrating the energy of the antenna signal into an exaggerated unidirectional beam. In a majority of line-of-sight applications the directional antenna permits the MPX HD multipoint extender receiver to be located up to 1000 feet from the transmitter. For extensive and standard wavelength frequencies, tower arrays are utilized in most cases as directional antennas. Some of the powerful directional antennas which use 15.8dB gain, like DB8 are meant for people who are at great distances from transmitters. The bow tie design of this directional antenna utilizes triangular elements instead of rods in an effort to increase its bandwidth allowing it to cover the complete UHF band.

Some of the different directional antenna models includes HGA51G-DIR30 Directional Antenna, R&S HE300 Active Directional Antenna, Avayon DB8 Multi-Directional Antenna, TR-24H-90-17, TR-24H-120-16, Astron 5.8 GHz 8 dBi Omni Directional Antenna model VG5808 etc. Some of the manufacturers of directional antennas include Antennas Direct, CP Technologies, Bountiful WiFi, Inc, D-Link Systems, Inc, Cisco Systems, Inc, Hawking Technologies, Inc etc.

There is no denying the fact that directional antennas play a vital role for certain indoor applications, but a mainstream of indoor installations is being utilized by omnidirectional antennas. In the end it can be said that the correct installation of a directional or omnidirectional antenna could be carried with a proper site survey.

This DB8 is the ideal antenna for employing in places that can draw extensive range signals from diverse directions and tender a striking substitute to exercising a Directional Antennas accumulated on a rotator.

This video was captured by webcam (not so great for quality but good audio). I am making radio contacts to other radio amateurs around the world via the new HO-68 Satellite FM Repeater from my radio shack in the UK. My equipment is Yaesu ft-847 and homemade IO/Ten element dual band beam. Software is Satscape www.satscape.co.uk

Just some video of the Wilson County Amateur Radio Club field day events here In Lebanon Tennessee wilsonarc.wordpress.com Remember your emergency supplies, The Ready Store ( best price guarantee) www.thereadystore.com And if you want to try to make a few bucks helping others prepare www.thereadystore.com

The top 50 Singles from the US Billboard Hot 100 song chart as measured by radio airplay audience impressions, digital and physical sales data and streaming activity data. This is the chart that is dated April 24, 2010! ENJOY!

<p> In particular, the wireless wireless g router is used for radio antennas, which are produced by the wireless g router and converted back into electrical impulses that may lead to the data on your computer. </ P> Types of Antennas Wireless wireless g router </ p> The Basics </ p> There are two types of such antennas. The first type of omnidirectional antennas. This may increase slightly higher signal in all directions. It would be great if it or a company, which offers free Wi-Fi or simply want to configure the wireless g router in the middle of the office or at home. It is to use their wireless devices throughout the home. The second type is called a directional antenna of the antenna. This antenna is used to send a very strong signal in one direction. Assuming that the company wanted to create and use the wireless devices in the building. Since omni-directional antennas are not as strong as directional antennas (the reason is because they have to distribute the signal in all directions), you can simply create a directional antenna anywhere in the house and point it in that direction. </ P> Range Extender </ p> Extender range is a directional antenna. The advantage of this type of antenna was first mentioned that it can be applied to both antennasalready. Mode of action is like a mirror. Simply connect the wireless g router as a simple way to create. But this time, a signal that a bounce-off occurs, and softeners for fires to get to a higher frequency. Say, for example, has a restaurant, and not only want to offer their customers free wireless access, but we also offer a complete environment of the restaurant without WiFi (for whatever reason). With this you can do that because of the general Extender can receive signals from up to 1-3 km. </ P>

Chris Matthieu, N7ICE, demonstrates how to surf the web on an Icom ID-1 D-Star ham radio!

UPDATED NOTE, MAY 2008: This is an old video from a year or more ago, when I was just getting my feet wet with building some HF radio kits. The Pixie is a great place to get started. I don’t have a great deal of knowledge of radio theory, but this was educational in the visceral sense that I got to touch and feel the static and sounds of the HF spectrum. As far as being educational, well, it’s not. Just enjoy this panorama of my small circuit board built on the kitchen table. I’m licensed as a General, but I am a novice builder. I assembled a Pixie I bought on Ebay, went over all the solder joints. This video shows what I get when I have the transceiver on the bench. The crystal is marked 7.040, but I seem to get signal at 7.038 +/-. So, it appears the XMIT function works–at least better than receive audio. I get a buzz when 9V is applied with a small dry battery. However, when I transmit “V” from my TS850S, the Pixie is making audio of it. Things work–but not everything works. I hope YouTube will work as a forum to get me on the air. Any tips? Please leave your comments on how to stop this op-amp from motorboating, and how to rubber teh xtal with a simple RIT. NOTE: These notes are old, and the pixie is semi-operational as of May 15 2007. But I’m still futzing with it. Next up–the mighty ROCK MITE!