.net barcode reader library Installing vertical antennas 561 in Software

Painting ECC200 in Software Installing vertical antennas 561

Installing vertical antennas 561
Recognizing Data Matrix In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Drawing Data Matrix 2d Barcode In None
Using Barcode encoder for Software Control to generate, create DataMatrix image in Software applications.
Capacity "hat"
Decode Data Matrix 2d Barcode In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
DataMatrix Generator In Visual C#
Using Barcode drawer for VS .NET Control to generate, create Data Matrix image in VS .NET applications.
28-17 Mounting commercial trap vertical
Data Matrix ECC200 Encoder In VS .NET
Using Barcode generator for ASP.NET Control to generate, create Data Matrix ECC200 image in ASP.NET applications.
Data Matrix 2d Barcode Creator In .NET
Using Barcode creator for VS .NET Control to generate, create Data Matrix ECC200 image in VS .NET applications.
Base insulator
Draw DataMatrix In VB.NET
Using Barcode maker for VS .NET Control to generate, create Data Matrix image in VS .NET applications.
GTIN - 128 Drawer In None
Using Barcode creator for Software Control to generate, create EAN / UCC - 14 image in Software applications.
Mounting pipe
Code128 Maker In None
Using Barcode creator for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
Barcode Generation In None
Using Barcode encoder for Software Control to generate, create bar code image in Software applications.
tion I do not recommend radials on the surface for ground-mounted antennas It is too easy for a guest or even a trespasser to trip over the radials, and this could land you in court Wire radials can be buried using a spade tip to cut a 3- to 4-in slit, and they even make for a better ground
Code39 Generation In None
Using Barcode maker for Software Control to generate, create Code 3 of 9 image in Software applications.
Data Matrix Drawer In None
Using Barcode generator for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
Ground mounting verticals and masts
Print MSI Plessey In None
Using Barcode creator for Software Control to generate, create MSI Plessey image in Software applications.
Data Matrix Drawer In .NET Framework
Using Barcode generation for .NET framework Control to generate, create Data Matrix 2d barcode image in .NET framework applications.
In the preceding section, the essential assumption was that the antenna is mounted above ground, on a mast or other support In this section you will take a look at the methods of ground mounting the antenna or its mast The same mast ideas are also useful for erecting supports for dipoles and other wire antennas Figure 28-20 shows a standard chain-link fence post used as a support for either a vertical antenna or a mast (which could be metal, PVC, or wood) The typical fence post is 125 to 200 in outside diameter and made of thick-wall galvanized steel Thus such a pipe makes a tough installation Some authorities believe that the pipe will last longer if painted its entire length (especially the underground portion) with a rust-inhibiting paint such as Rustoleum
Painting Code 128 In None
Using Barcode generator for Online Control to generate, create USS Code 128 image in Online applications.
Reading Code 128 In .NET Framework
Using Barcode scanner for VS .NET Control to read, scan read, scan image in VS .NET applications.
562 General antenna mechanical construction techniques
Barcode Generator In None
Using Barcode creator for Font Control to generate, create barcode image in Font applications.
UCC.EAN - 128 Creator In None
Using Barcode creation for Word Control to generate, create UCC - 12 image in Office Word applications.
Coax to transmitter
GS1 - 13 Scanner In Visual C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET applications.
UPC Symbol Generation In Java
Using Barcode generator for BIRT Control to generate, create UCC - 12 image in BIRT applications.
Radials
Insulator Rope Insulator Rope Insulator Rope Insulator Rope
28-18 Feeding the mast-mounted vertical antenna
3 to 4 in or more Ground level
Coax to XMTR
Buried radials 28-19 Feeding the ground-mounted vertical antenna
The beauty of the fence post as an antenna support is that it is relatively easy to install, and supplies are obtained easily from hardware stores The post is mounted in a concrete plug set at depth D in the ground (see again Fig 28-20) The depth D is a function of local climate and local building codes In the absence of local regulations to the contrary, make the hole at least 24 in deep (or more) The depth is determined by the 100-year depth of the frost line in your area, a figure well familiar to local building experts Keep in mind, however, that shallower depths may be legal for
Installing vertical antennas 563
H 28-20 Fence post mounting
Ground level Backfill Concrete plug Gravel D
fence posts, but installation of a vertical antenna (or mast) on top of the fence post changes the mechanical situation considerably The hole can be dug with a post-hole digger tool or an earth-auger-bit tool The latter often can be rented in either gasoline engine, electrical motor, or manual versions from tool rental stores Once the hole is dug, place about 4 in (or local requirement) of gravel at the bottom of the hole This gravel can be bought in bags from hardware stores for small jobs The post is installed at this point and made plumb (ie, it is made to sit vertical in the hole) Gravel can be used to force the post to remain upright as the job is finished On top of the gravel is a concrete plug that fills the hole to at least 4 in below the surface The rest of the hole is backfilled with dirt, unless you want the plug to extend all the way to the surface Do not put anything on top of the post for at least 4 days or whatever period of time the concrete manufacturer recommends Concrete needs time to cure, and 4 to 7 days seems to be the recommended period of time It is probably a good idea to install the post one weekend and then complete the antenna installation the following weekend
564 General antenna mechanical construction techniques Chain-link fence posts tend to be about 4 ft high, and this is sufficient for installation of masts for inverted-V and dipole support However, for vertical installation, make the height H of the post about 18 in (otherwise, the antenna tries to act differently from the instructions) If the antenna is a standard vertical with the usual form of offset base (as shown in Fig 28-20), then use either the mounting brackets that come with the antenna or U-bolts fastened around the fence post Never use a single mounting point; always use at least two-point mounting to prevent the antenna from pivoting and shearing off the mounting hardware Figure 28-21 shows how to mount a 2 4 mast to a fence post Good-quality 2 4 lumber can be purchased in lengths up to 20 ft, although, 8-, 10-, 12-, and 16-ft lengths are the most commonly available (in my area, 16- and 20-ft lengths have to be bought at professional contractor lumberyards rather than those which serve homeowners) The 2 4 selected should be kiln-dried and pressure-treated It also should be painted in order to minimize the effects of weathering on the mechanical integrity of the installation Good-quality 2 4 lumber is relatively inexpensive, but
2" 4" 16'
Copyright © OnBarcode.com . All rights reserved.