MOUNT SYSTEMS FOR STANDARD AND VERY LOW LOSS REQUIREMENTS Selection of proper cable kits and mount types has become more important as we have moved up the frequency band. Very high losses and noise in a cable kit will greatly affect the performance of all systems. This is more of a problem above the UHF band. A LL-195 cable exhibits a loss of 11 dBd per 100 feet at 900MHz. This means that the loss in a standard 17 foot cable is 1.82 dBd. At higher frequencies the losses are even greater. Another source of loss is in the mount itself. The NMO type mount was developed for mobile radio installation when most services operated in the 30-50MHz range. Loss was not much of a factor at those frequencies. Today many of our systems operate well into the GHz range where loss is a big deal. Advances have been made such as using all brass mounts to avoid corrosion but this has its drawbacks because brass is soft. If not handled carefully, a brass mount can bend or even break during installation. Its softness also affects its ability to pierce other metals during installation causing a less than perfect ground connection. A final consideration with regard to NMO type mounts in general is the tendency for cross threading when installing an antenna because of the flats in the standard mount. In an attempt to counteract many of these problems we patented an all brass mount with no flats, and a stainless steel piercing saddle to provide a good electrical and mechanical connection. We developed a new technique for shielding the feed point of this mount to provide a better constant impedance low loss assembly. We will continue to support our legacy standard mounts, including the high distributive capacity (big button) versions while being inspired design the next GEN products for even tougher applications. C NMO TYPE MOUNT KIT CE NMO TYPE MOUNT KIT C TYPE All Brass 3/8"-3/4" Hole MB TYPE All Brass 3/4" Hole MH TYPE Standard Hi Dist Cap MHB TYPE All Brass Hi Dist Cap STANDARD FEED SYSTEM FULLY SHIELDED VERY LOW LOSS FEED SYSTEM STAINLESS STEEL SADDLE MOUNTS For data sheets with specifications, go to www.mobilemark.com 18 ANTENNAS
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