Units; Power: Watts; Power Dbm; Match: Vswr - BIRD BirdTechnologies SignalHawk SH-36S Operating Instructions Manual

Units

Soft key functions that select the units of measure (Figure 100) are enabled.
For power measurements, Watts or dBm can be selected.
For match measurements, VSWR, dB, rho, and percent (%) can be selected.
Figure 100 Power Meter, Digital Display, Units Screen
(Directional sensor)
Note: The Units screen applies to Directional and
Wideband Power sensors only.

Power: Watts

Measures power in Watts.
 
Power Watts =
Power: dBm
Measures power in dBm.
 

Power dBm

= 10

Match: VSWR

Measures match, a complex ratio of reflected power to forward power
expressed in VSWR.

VSWR = 1 + Sqrt Pr Pf
Note: "Pr" = Reflected Power, "Pf" = Forward Power

Match: Return Loss dB

Measures match, a complex ratio of reflected average power to forward power
expressed in dB.
 
ReturnLoss dB
118
10  dBm 30
   10
–
  
Log Power Watts
     
1 Sqrt Pr Pf –
  
= 10 Log Pr Pf
 
 
+ 30dB
   
