I am trying to find out the operating frequencies for Cingular and Verizon's cellular Internet services, that are used with the PCMCIA (laptop) cards. Basically I'm trying to find a high gain antenna that will be compatible with both services, for the slower and higher speeds (if possible). So far I have not been able to find a complete list of the frequencies, that include the faster and slower access speeds. Can anybody point me in the right direction?? I really appreciate the help.
Here's the deal... if you want to be able to take advantage of both the
800Mhz band as well as the 1900Mhz band you need either a dual-band system with omni-directional antenna or you will need two Yagis, one for each frequency, cabled together into a mixer and fed into your dual-band amp.
Typically, if using a Yagi, you choose one or the other, depending on your carrier and location, and settle for only one band.
VZW primarily uses 800Mhz. However, in Florida (that I know of) they use a whole lot of 1900Mhz. Depends on the area. There are others that use
1900Mhz.
For my wireless amp/repeater system I chose the dual-band amp with omni-directional antenna so I could use it with any carrier anytime. Also so that visitors to my home-office could also use their own cell phone, no matter what carrier they had (Nextel being the only exception).
Also, high-gain Yagis might be fine if you have a decent signal to point one at. However, due to the nature of CDMA technology, and it's ability to use multiple disjointed signals reflecting from various directions to produce a single usable signal, sometimes an omni directional antenna will do better than a highly directional Yagi. Just depends.
This is a highly specialized area and often professional evaluation and installation is the best bet.
My advice is, when in doubt about your signal area and/or you needs, always go with dual-band and omni.
I'd go with an LPDA (Log Periodic Dipole Array) like an off-the-air TV antennas use, err..."like" as in design and construction. They have slightly less gain than a Yagi, but far far greater bandwidth. It could cover 500 MHz up to over 3,000 MHz.
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The log periodic antenna is a particularly useful design when modest levels of gain are required, combined with wideband operation. A typical antenna will provide between 4 and 6 dB gain over a bandwidth of 2:1 while retaining an SWR level of better than 1.3:1. With this level of performance it is ideal for many applications, although a log periodic antenna will be much larger than a Yagi that will produce equivalent gain. However the Yagi is unable to operate over such a wide bandwidth.
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