مقوي الشبكة Signal Booster شرح الانتينا الداخلية و انواعها Indoor Antenna
F Connector vs N Connector for repeater signal antenna
الانتينا الداخلية تعمل دائرة 360 درجة تغطى مدي يصل الى 15 متر
و يتوقف قوتها على مدى الاشارة فى الانتينا الخارجية الحاصل عليها
https://www.youtube.com/watch?v=BGfMurqCwY0
توصيلات الانتينا تكون اما F Connector او N Connector
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Type N
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Discussions about the UHF connector’s shortfalls will invariable lead to the ‘Type N’ system. Named after Paul Neill of
Bell Labs, the Type N is perhaps the most versatile and mechanically sound of the antenna connector types available today. It was developed in the 1940’s for military use, and today it can handle frequencies up to 11 GHz. By employing a rubber gasket in the seat of the male casing, the Type N creates a waterproof connection point.
Because of its waterproof and mechanically sound qualities the Type N connector is most often used in Base Station setups or repeater installs;
however, a growing number of Hams are replacing the UHF connectors on their mobile radios with aftermarket Type N connectors. From what I’ve heard, some or many of the European version mobile radios have been equipped with stock Type N connectors, a sign that manufacturers recognize it’s superior performance but that Americans are simply not quite ready for a complete transition. Long story short, the Type N connector is the best of the bunch, and as a whole, we should probably start using them more often.
Type F
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Let’s start with the first connector you are likely to come across as a new ham–the SMA. The SMA is a lightweight, all-purpose connector that is particularly practical for smaller applications like handhelds. It can effectively carry signals ranging from 0-18 GHz (well outside the range of most Ham operations!) and utilizes a threaded connection, which is one of the most secure connection types. As is the case with a great deal of radio equipment, the SMA was designed to satisfy military requirements, so even for it’s small size it provides a very strong connection.
The SMA was developed around the 1960’s in an effort create a simple connection interface for RF coaxial cable. Its creation was most likely in response to the development of the 75 خ© ‘
F Connector‘ early in the 1950’s, which is most commonly used for television applications. In fact, as a word of warning to new Hams, make sure to not confuse the two! Both the F Connector and SMA connector look rather similar–the main difference, other than their dimensions, is their impedance. The standard impedance for an amateur radio setup is 50 خ©, while the F Connector is 75 خ©. Attempting to mate a 75 خ© connector to a 50 خ© antenna will yield less than desirable results!
