HP 8921A - Audio Analyzer; Audio Source; External Transmitter Key Relay; Interrupt Capability

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Chapter 16, Radio Interface Screen
Radio Interface Functional Description
Audio Source
The Test Set has two audio sources, AFGen 1 and AFGen 2. Either or both of
these sources can be routed to the OPTION INTERFACE connector. See "Audio
Out" on page 520
.
Audio Analyzer
The Test Set’s audio analyzer can be accessed through the OPTION INTERFACE
connector.
See "Audio Input" on page 520.
External Transmitter Key Relay
Two pins on the Radio Interface are connected in parallel with the Key Out 1 and
Key Out 2 pins on the front-panel MIC/ACC connector.
The Key Out 1 and Key Out 2 pins allow a radio transmitter to be keyed through a
front-panel display field called Ext TX Key. Refer to
"Key Out 1" on page 520 and
"Key Out 2" on page 520.
Interrupt Capability
Two pins on the Radio Interface are designated as Interrupt lines 1 and 2. If
Interrupt 1 or 2 is armed, by selecting Arm on the RADIO INTERFACE screen,
and the corresponding pin is grounded, the word Tripped is displayed on the
RADIO INTERFACE screen, and a status register bit is set.
Refer to
"Interrupt Input 1" on page 521 and "Interrupt Input 2" on page 521.
+12.6 V, −12.6 V Supplies
The Radio Interface provides +12.6 V and −12.6 V power supplies capable of
powering low-current devices.
Refer to
"−12.6 V" on page 520, and "+12.6 V" on page 520.
Refer to
"Using the Radio Interface (Manual Operation)" on page 409 and "Using
The Radio Interface (Remote Operation)" on page 415
for more detailed
information about using the Radio Interface.