.net barcode reader free Adjusting, installing, and troubleshooting antennas and transmission lines in Software

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436 Adjusting, installing, and troubleshooting antennas and transmission lines
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22-3 MFJ-259 VSWR analyzer
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The resistance measurement assumes a resistive load (ie, the measurement is made at the antenna s resonant frequency), and is referenced to 50 The VSWR and resistance measurements should be consistent with each other If the VSWR is 2:1, then the resistance should be either 100 (100/50 2:1) or 25 (50/25 2:1) If the resistance is not consistent with the VSWR reading, then you should assume that the impedance has a significant reactive component and take steps to tune it out In addition to antenna measurements, the MFJ-259 is equipped to measure a wide variety of other things It will measure the velocity factor of transmission line,
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Doping out coaxial cable 437 help in tuning or adjusting matching stubs or matching networks, measure capacitance or inductance, and determine resonant frequency of LC networks
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When you install an antenna, or do a bit of preventive maintenance, or find the antenna is not working properly, one thing to check is the transmission line Two basic measurements are popular Figure 22-4 shows how to make ohmic checks The cable consists of an inner conductor and an outer conductor (shield) With terminals A and B open there should not be any resistive path across the input terminals (as shown) If a high resistance is seen, then there might be some contamination in the system, or the insulation has failed, permitting a current path A low resistance indicates a short circuit If the cable has been cut, or an object passed through, or the connector is messed up, then a short can result If terminals A-B are shorted together, a low resistance should be noted If not, then it is likely that the center conductor is open Of course, if connectors are on the line, either the shield or center conductor could be at fault The other issue is loss of the transmission line Cable losses get higher as cables age, so low loss on installation does not guarantee low loss later on Losses in new cables run from 02 dB/100 ft at 4 MHz At 30 MHz the losses are 07 dB/100 ft to 26 dB/100 ft At VHF/UHF frequencies the losses rise considerably Figure 22-5 shows a test setup for coaxial cable It is necessary to know the length of the piece of coax under test For ease of calculations a 100-ft section
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22-4 Ohmmeter used to test coax
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438 Adjusting, installing, and troubleshooting antennas and transmission lines
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22-5 Attenuation test for coax
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should be used Two RF power meters (M1 and M2) are used to measure the input power to the line (M1) and the delivered power (M2) The difference in power determines the loss The loss is LossdB where Loss is the loss of the cable, in dB PM1 is the power reading on M1 PM2 is the power reading on M2 If the cable length is 100 ft, then you already have the loss in dB/100 ft But if length L is anything other than 100 ft, then you need to make the following calculation: LossdB/100ft LossdB Lft 100 [222] 10 log PM2 PM1 [221]
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CHAPTER
Antennas for radio direction finding (RDF)
RADIO DIRECTION FINDING IS THE ART AND PRACTICE OF EITHER LOCATING YOURSELF OR A radio station by using a directional radio antenna and receiver When the FCC wants to locate an illegal station that is transmitting, they will use radio direction finders to triangulate the position If they find the bearing from two stations they will locate the station at the intersection However, there is a fair degree of ambiguity in the measurement As a result, radio direction finders typically use three or more (hence triangulate ) sites Each receiving site that can find the bearing to the station reduces the overall error At one time aviators and seafarers relied on radio direction finding It is said that the Japanese air fleet that attacked Pearl Harbor, Hawaii, on December 7, 1941 homed in on a Honolulu AM radio station During the 1950s and early 1960s AM radios came with two little circled triangle marks at the 640-kHz and 1040-kHz points on the dial These were the CONALRAD frequencies that you could tune to in case of a nuclear attack (right before you kissed your butt good-bye, I suspect) All other radio stations were off the air except the CONALRAD stations The enemy was prevented from using these frequencies for RDF because the system used several stations that transmitted in a rapidly rotating pattern No one station was on the air long enough to allow a fix The result was a wavering sound to the CONALRAD station (which we heard during tests) that would confuse any enemy who tried to DX his way into our cities with nuclear weapons Radio direction finders based on the AM broadcast band (BCB) looked a bit like Fig 23-1 A receiver with an S meter (which measures signal strength) is equipped with a rotatable ferrite loopstick antenna to form the RDF unit A degree scale around the perimeter of the antenna base could be oriented toward north so that the bearing could be read Loopstick antennas have a figure-8 reception pattern (Fig 23-2A) with the maxima parallel to the loopstick rod and the minima off the ends of the rod When the antenna is pointed at the signal, maximum reception strength is achieved Unfortunately, the maxima are so broad that it is virtually impossible to find the true point on the compass dial where the signal peaks The peak is too shallow for that
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