RL to VSWR tollerance converion

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disisku_22

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Hi
How to express RL(return loss) tolerances of +/-3 dB in VSWR. if i have 3dB RL tolerance then what should be the VSWR tolerance.
 

For sake of simplicity let's call V=VSWR, then:

RL=-20*Log[(V-1)/(V+1)], solving with respect to V:

V=[1+\[{ 10}^{(-RL/20}\]]/[1-\[{ 10}^{(-RL/20}\]]

then if you have a tolerance of "x" dB, then:

V(x)={1+\[{ 10}^{[(-RL+x)/20]}\]}/{1-\[{ 10}^{[(-RL+x)/20]}\]}
 
HI Albbg,
thanks.. but the tolerance varies depending on the RL. for example for 10dB RL as per above calculation VSWR tolerance is +/-0.5188 for +/-3dB RL tolerance, and same for 6dB RL the VSWR tolerances is +/- 1.8741. is there any relation ship between RL and VSWR for the tolerance.
 

disisku_22 said:
HI Albbg,
thanks.. but the tolerance varies depending on the RL.
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Yes, because dB is a relative measurement.
Unfortunately you cannot eliminate the tolerance in dB from the value of RL.
 
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