.net barcode reader free Radiator element Matching stub in Software

Encoding DataMatrix in Software Radiator element Matching stub

Radiator element Matching stub
Decode Data Matrix ECC200 In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Printing ECC200 In None
Using Barcode creation for Software Control to generate, create Data Matrix ECC200 image in Software applications.
Coax
Read Data Matrix 2d Barcode In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Paint ECC200 In C#
Using Barcode encoder for VS .NET Control to generate, create DataMatrix image in VS .NET applications.
Sliding short
Drawing Data Matrix 2d Barcode In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create ECC200 image in ASP.NET applications.
Data Matrix ECC200 Drawer In .NET
Using Barcode printer for .NET framework Control to generate, create Data Matrix image in .NET framework applications.
276 Log
Make DataMatrix In VB.NET
Using Barcode encoder for VS .NET Control to generate, create Data Matrix 2d barcode image in .NET applications.
Print Code 128 Code Set B In None
Using Barcode creator for Software Control to generate, create Code 128 Code Set B image in Software applications.
2S d
Draw Code39 In None
Using Barcode encoder for Software Control to generate, create Code39 image in Software applications.
Barcode Creation In None
Using Barcode maker for Software Control to generate, create barcode image in Software applications.
18-3 Stub matching
USS-128 Creator In None
Using Barcode drawer for Software Control to generate, create UCC - 12 image in Software applications.
Print EAN-13 In None
Using Barcode printer for Software Control to generate, create European Article Number 13 image in Software applications.
346 VHF/UHF transmitting and receiving antennas from the antenna feedpoint that matches the impedance of the transmission line In the example shown, the transmission line is coaxial cable, so a 4:1 balun transformer is used between the stub and the transmission line The two adjustments to make in this system are: (1) the distance of the short from the feedpoint and (2) the distance of the transmission line tap point from the feedpoint Both are adjusted for minimum VSWR The gamma match is basically a half delta match, and operates according to similar principles (Fig 18-4) The shield (outer conductor) of the coaxial cable is connected to the center point of the radiator element The center conductor of the coaxial cable series feeds the gamma element through a variable capacitor
Painting MSI Plessey In None
Using Barcode encoder for Software Control to generate, create MSI Plessey image in Software applications.
Making Data Matrix ECC200 In Objective-C
Using Barcode creation for iPad Control to generate, create Data Matrix ECC200 image in iPad applications.
VHF/UHF antenna examples
Creating USS Code 128 In C#.NET
Using Barcode maker for .NET Control to generate, create Code 128 image in VS .NET applications.
Barcode Drawer In .NET
Using Barcode generator for ASP.NET Control to generate, create bar code image in ASP.NET applications.
Although it is probably not necessary to reiterate the point, VHF/UHF antennas are not substantially different from HF antennas, especially those for the higher bands However, for various practical reasons there are several forms that are specially suited, or at least popular, in the VHF/UHF bands In this section we will take a look at some of them
Printing Code-128 In Java
Using Barcode encoder for Java Control to generate, create Code 128 Code Set B image in Java applications.
EAN13 Encoder In Objective-C
Using Barcode creator for iPad Control to generate, create EAN-13 Supplement 5 image in iPad applications.
Coaxial vertical
Drawing GS1 - 12 In VS .NET
Using Barcode maker for ASP.NET Control to generate, create UPC Symbol image in ASP.NET applications.
Barcode Decoder In C#.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
The coaxial vertical is a quarter-wavelength vertically polarized antenna that is popular on VHF/UHF There are two varieties In Fig 18-5A we see the coaxial antenna made with coaxial cable Although not terribly practical for long-term installation, the coax-coax antenna is very useful for short-term, portable, or emergency applications For example, a boater found himself adrift, and in dire trouble, after a storm damaged the boat The mast-top VHF antenna was washed away, leaving only the end of the coaxial cable dangling loose Fortunately, the boat operator was a two-way radio technician, and he knew how to strip back the coaxial cable to make an impromptu coaxial vertical The coax-coax antenna shown in Fig 18-5A uses a quarter-wavelength radiator and a quarter-wavelength sleeve The sleeve consists of the coax braid stripped back and folded down the length of the coax cable The maximum length is found from the equation below (actual length is trimmed from this maximum):
Clamp
Radiator Center
Insulator
Gamma match
Clamp
18-4 Gamma matching
VHF/UHF antenna examples 347
Seal end with RTV or caulk
Center conductor with insulation left on /4
Seal with RTV or caulk
/2 18-5A Coaxial vertical based on coaxial cable
Coax braid folded back /4
Seal with solder
To XMTR
2952 V in FMHz
[185]
The antenna is mounted by suspending it from above by a short piece of string, twine, or fishing line From a practical point of view, the only problem with this form of antenna is that it tends to deteriorate after a few rainstorms This effect can be reduced by sealing the end, and the break between the sleeve and the radiator, with either silicone RTV or bathtub caulk A more permanent method of construction is shown in Fig 18-5B The sleeve is a piece of copper or brass tubing (pipe) about 1 in in diameter An end cap is fitted over the end and sweat-soldered into place The solder is not intended to add mechanical strength, but rather to prevent weathering from destroying the electrical contact between the two pieces An SO-239 coaxial connector is mounted on the end cap The coax is connected to the SO-239 inside the pipe, which means making the connection before mounting the end cap
348 VHF/UHF transmitting and receiving antennas
Radiator element
Insulator PL-259 End cap 18-5B Tubing coaxial vertical
Pipe
VHF/UHF antenna examples 349 The radiator element is a small piece of tubing (or brazing rod) soldered to the center conductor of a PL-259 coaxial connector An insulator is used to prevent the rod from shorting to the outer shell of the PL-259 (Note: an insulator salvaged from the smaller variety of banana plug can be shaved a small amount with a fine file and made to fit inside the PL-259 It allows enough center clearance for 1 8-inch or 3 16-inch brass tubing) Alternatively, the radiator element can be soldered to a banana plug The normalsize banana plug happens to fit into the female center conductor of the SO-239
Copyright © OnBarcode.com . All rights reserved.