HP 8920A, Руководство пользователя

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Chapter 10, Signaling Encoder (AF Generator 2)
Using the LTR Encoder
Radio Test Examples
The following procedures establish a receiver or transmitter trunked channel on
the home channel.
To Test Your Receiver
To establish a trunked receiver channel on the home channel,
1. Connect the RF IN/OUT port of the Test Set to your radio’s antenna port.
2. If you want to make audio measurements, connect your radio’s speaker output to the
Test Set’s AUDIO IN port(s), and turn the Test Set’s VOLUME up about half way.
3. Turn your radio’s volume up about half way.
4. Turn your radio on, and select the channel to test.
5. Press the PRESET key (to establish a known instrument state for this procedure).
6. Access the DUPLEX TEST screen.
7. Set the
Tune Mode
field to
Manual
.
8. Set the
RF Gen Freq
field to the receive frequency for the selected channel. (Note
that the preset function caused the
Amplitude
to be set to -80 dBm, and AFGen1 is
set to 1 kHz FM with 3 kHz deviation. These settings should work with your radio to
produce the audio tone.)
9. Access the ENCODER screen, and select the LTR mode.
10. Enter your Area Number (0 or 1) in the
Area 1
field.
11. Enter the home channel number in these fields:
Goto 1
,
Home 1
, and
Free 1
. (For
example, if your radio’s home channel is 2, enter 2 in all three fields.)
12. Enter the Receive ID number for your radio in the
ID 1
field.
13. Set the
Send Mode
field to
Cont
.
14. Set the
AFGen2 To
field to
FM
,
1 kHz
.
15. Set the
FM Coupling
field to
DC
.
16. Select
Send
to continuously output the encoded signal.
You should hear the 1 kHz tone from your radio and/or the Test Set’s speaker,
indicating that the trunked channel has been established.
If you connected the radio’s speaker to the AUDIO IN port(s), access the
DUPLEX TEST screen to display the
AC Level
and
SINAD
measurements.