Smith Chart Conversions
12-22-2017, 10:42 PM
Post: #1 Eddie W. Shore Senior Member Posts: 1,319 Joined: Dec 2013
Smith Chart Conversions
The program SMITHCHART calculates one of two sets of conversions:

Return Loss (RL) to Standing Wave Ratio (SWR, in decibels): RL to ρ (reflection coefficient) to σ (voltage standing ratio) to SWR

Standing Wave Ratio to Return Loss: SWR to σ to ρ to RL

HP Prime Program SMITHCHART

Code:
EXPORT SMITHCHART() BEGIN // 2017-12-17 EWS // Smith Chart Conversions // HP 32S Engineering Applications LOCAL k,x,RL,p,s,SWR; INPUT({ {k,{"RL to SWR","SWR to RL"}}, x},"Smith Chart", {"Starting at: ","Value: "}); IF k==1 THEN // RL to SWR RL:=x; p:=ALOG(−RL/20); s:=(1+p)/(1-p); SWR:=20*LOG(s); ELSE // SWR to RL SWR:=x; s:=ALOG(SWR/20); p:=(s-1)/(s+1); RL:=20*LOG(1/p); END; // Results PRINT(); PRINT("Results"); PRINT("Return Loss: "+RL); PRINT(" "); PRINT("Reflection Coefficient"); PRINT("ρ: "+p); PRINT(" "); PRINT("Voltage Standing Wave Ratio"); PRINT("σ: "+s); PRINT(" "); PRINT("SWR (dB): "+SWR); END;

Examples

SWR to RL: Given 11.95 dB SWR

Results:
Return Loss: 4.48590571028
ρ: 0.59662948831
σ: 3.95822064836
SWR: 11.95

RL to SWR: Given RL at 6.35 dB

Results:
Return Loss: 6.35
ρ: 0.481393254
σ: 2.85648666437
SWR: 9.11664401758

Source:
Hewlett-Pacakrd. Step by Step For Your HP Calculator: Engineering Applications. Ed. 1. Corvallis, OR January 1988
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