Preamp; Offset; Units - BIRD BirdTechnologies SignalHawk SH-36S Operating Instructions Manual

Preamp

Controls the built-in amplifier on the signal input. This lowers the noise floor,
allowing very low power signals be detected, by giving a 24 dB nominal gain boost.
Note: Attenuation is automatically disabled to 0 when Preamp is
activated.
Note: The preamp should not be used with input signals greater than
-30 dBm.

Offset

Shifts the signal to compensate for external factors (attenuation, couplers,
amplifiers, etc.). This allows for a true signal level reading.
1. Measure the total amount of loss for all attached signal devices.
2. Enter the measured amount as the Offset value or gain.
Example - The system has 10 dB of loss due the use of a coupler;
enter the value of 10 in the Offset. Offset range is -100 to +100.

Units

Sets the units to be displayed on the graph.
dBm

dBm = 10 Log Power Watts
dBuV
dBm = dBuV –
dBmV
dBm = dBmV –
dBV
10 
dBm = dBV –
Volts
Note: Selecting this unit will disable the Scale option. See "Scale" on
page 70.

dBm = 20 Log Power Volts
Watts
Note: Selecting this unit will disable the Scale option. See "Scale" on
page 70.
10  dBm 30
 
Watts =
   
10 
  90
log 50 –
10 
 
log 50 – 30
 
log 50 + 30
   
+
 10  
–
+ 30dB
30dB
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