If will see standing wave comparing can express be with the viewpoint of power
／ of Pr) of √ of Po + of √ of SWR = ((Pr of √ of √ Po - )
Po: Enter the power Pr of aerial system: Ji of the low Xi that remove porcelain blows You Yu You grave β
Course operation SWR and per cent of power of Pr/Po (reflex) the concern is as follows
Pr/Po = [(SWR-1)/(SWR+1)]^2
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Watch of standing wave comparing basically is dynamometer it can measure power input and reflection power but the type on the basis no matter power input reflexes power to become certain proportion to no matter why power input wants only,be compared to same standing wave that is to say with power input certainly is alterable resistor is used to adjust drive when measuring power input watch
Disclose standing wave comparing is expressed even if dynamometer is in when measuring power, it established a few groups of power beforehand (like 5W, 20W, 200W) makes power input apropos is this punctual (5W, 20W, 200W) finger can achieve full scale to be dialed when you is to measure power input when CAL position just you can adjust position of pressing with a finger to be dialed when you is quantity reflex power when SWR position just the scale that what you look at that time is SWR
With DIAMOND the standing wave of series compares a list and it has talk usage of FWD/REF SWITCH of of Func of knob of a Calibration and of Power Range of 3 select switch is as follows
Measure power input 1. Dial POWER RANGE 200W FUNC to dial PWR FWD/REF to dial FWD
2. Press the emissive key of radio machine
3. Moderate alternative POWER RANGE with numerating accurately power
The quantity reflexes power 1. Dial POWER RANGE 200W FUNC to dial PWR FWD/REF to dial REF
2. Press the emissive key of radio machine
3. Moderate alternative POWER RANGE with numerating accurately power
Quantity standing wave is compared 1. Dial FUNC counterclockwise of knob of CAL position CALIBRATION to rotate after all
2. Press the emissive key of radio machine adjusts CALIBRATION knob to make pressing with a finger attains full scale
3. Dial FUNC SWR position to be numerated by the SWR scale that expresses a head standing wave compares read a value
When use standing wave is compared than expressing the standing wave that measures aerial, want to compare standing wave the watch to because the transmission loss of transmission line can make a standing wave that the quantity comes out lesserer than numerical value,near aerial end as far as possible turn " joy into " of standing wave comparing for example originally the standing wave of aerial is 10%) than reflexing power per cent for 1.92 (
Per cent of power of reflection 0.25W reflex is 2.5% namely SWR=1.03 volume rises is joy really is disastrous
In addition current major standing wave compares a list is to use inductive means to compare signal response to standing wave inside the watch measure circuit to be able to blast off at the same time when measure so at the same time this does not meet the switch that switch standing wave compares a watch to go up attaint radio if machine is a bit more careful
Most the stand or fall that after warns a bit antenna cannot sheet sees standing wave compare the reason that everybody has blind faith in standing wave to compare so now to compare a watch very simply to buy the means that gets me to say to be not compared because of aerial standing wave everywhere because of standing wave very low feel all OK be pleased with oneself studies more the other of aerial
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