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Chapter 24, Connector, Key, and Knob Descriptions
Connector Descriptions
MODULATION INPUT
This connector provides an external modulation connection to the RF Generator.
Operating Considerations
Input impedance = 600Ω
Maximum input level = 12 V peak
Full scale input = 1 V peak
The
Mod In To field of the RF GENERATOR screen sets the type of modulation
(AM or FM) and sensitivity (%AM/Vpk or kHz/Vpk) for this connection.
This signal is summed with the microphone MIC IN signal from the MIC/ACC
connector.
The
FM Coupling field in the RF GENERATOR, DUPLEX TEST, and various
encoder modes selects ac or dc coupling of this signal for FM operation.
Parallel Port
This port is optional on the HP 8920A.
This port is used with printers requiring a parallel interface when printing screen
images or test results. Set the
Printer Port: field (on the PRINT
CONFIGURE screen or TESTS (Printer Setup) screen) to
Parallel to print to
this port. Use address 15 when sending data to this port from IBASIC programs.
Pin numbers are embossed on the connector. Pin assignments are as follows:
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