HP 8921A - Logical ID

331
Chapter 10, Signaling Encoder (AF Generator 2)
EDACS Encoder
Logical ID
This field is used to specify the identification number of the calling radio. It
should be set to the Logical ID of the radio being tested when performing
transmitter tests. Generally, when performing receiver tests, it must be set to a
Logical ID different from that of the radio being tested.
Polarity
This setting determines how the encoder’s digital data modulates the RF
Generator. This field is usually set to Norm. Invert is used for narrowband
systems. This field is automatically set to the correct polarity by the Standard
field.
When this field is set to
Invert, a logical high (1) causes the output level of the
encoder to be negative. A logical low (0) causes the level to become positive.
When using FM, the RF Generator would then produce a negative frequency
deviation for a positive-going digital transition - the opposite of the normal mode
of operation.
This field is automatically set to the correct polarity by the
Standard field.
RX Test
When Start is selected, the encoder sends a digital message over the control
channel to tell the mobile to go to the specified working channel (called a channel
assignment). Immediately after the message is sent, the RF Generator’s and RF
Analyzer’s frequencies are automatically changed to match the same working
channel settings.
See Also
Handshake
field description, on page 330