User guide

55
Gain & Loss (2 Port) Measurement
This two-port thru measurement is used to test the insertion gain and loss of a
cable. To run this measurement, connect the transmitter of the device being
tested to Port 1 and the receiver of the device to Port 2. Transmission loss or gain
will be negative if the device has a loss and positive if the device has a gain.
Note: When measuring antenna isolation in the -80 to
-90 dB range, the IFBW setting needs to be 100 Hz.
Bias Tee Voltage
Adjusts the reading to compensate for any DC voltage added from a bias tee
attached to the RF line being tested. The SignalHawk puts a 12V or 24V power
supply voltage onto the RF line, so the same line is carrying RF data & power.
Then it measures how much current is being drawn from the line.
Bias Tee
Turns the Bias Tee compensator on and off. When this is on, it will display the
current draw from the bias tee on the bottom of the display.
Note: Overdrawing from the bias tee will cause an automatic shut
down of the bias tee. The current overdraw limit is 1,000 mA.
Figure 44 Example Gain & Loss
CAUTION
Do not turn on a DC bias if the thru cable is attached from
the VNA In to the VNA Out. This will damage the VNA input
and destroy the unit.
y
V
Transmitted
V
Incident
------------------------------ -=
Measurement
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