HP 8920A, User Manual

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S:\HP892XX\USRGUIDE\manual\confscrn.fb
Chapter 7, Configure Screen
Field Descriptions
RX/TX Cntl
This function controls automatic screen changes between the RX TEST and TX
TEST screens during radio testing. It is divided into two fields:
The
Auto/Manual
field enables/disables automatic switching between the RX
TEST and TX TEST screens under certain testing conditions.
•
Auto
allows automatic screen changes between the RX TEST and TX TEST screens
while testing radios.
•
Manual
requires you to select the RX TEST or TX TEST screen when performing ra-
dio tests.
The
Carrier/PTT
field specifies the condition that will cause automatic screen
changes.
•
Carrier
causes the instrument to automatically switch from the RX TEST screen to
the TX TEST screen when an RF carrier is detected. The screen returns to RX TEST
when the carrier is no longer detected.
•
PTT
(Push-To-Talk) causes the instrument to automatically switch from the TX TEST
screen to the RX TEST screen when a microphone connected to the MIC/ACC connec-
tor is keyed. The screen changes back to TX TEST when the microphone is no longer
keyed.
Operating Considerations
CAUTION: The Test Set can be damaged by connecting a reverse-power signal to the DUPLEX OUT port
of >200 mW.
If
Auto
and
Carrier
are used together, the screen may continuously change
between RX TEST and TX TEST. This only occurs if the RF IN/OUT port is used
with the RF Generator
Amplitude
set
≥
35 dBm (a much higher level than is
typically used for receiver tests). To prevent this problem, set the
Amplitude
≤
35 dBm or
Off
, or use the DUPLEX OUT port for the RF Generator’s output.