Ramsey Electronics COM3010 User Manual page 36

TYPICAL TEST PROCEDURES
Frequency Error Measurement
7. The COM3010 will also display the Counted Frequency (Lower left field) and The
Frequency Error (lower right field) in the RECEIVE screen.
8. Press
9. Adjust the transmitter's frequency until the error displayed is zeroed to the center mark
of the Frequency Error Bargraph Meter or the Digital Frequency Error Meter reads zero.
Deviation Measurement
10. Press the
Digital FM Deviation Meter.
11. Inject appropriate audio signal into the transmitter under test.
12. Key the transmitter
13. Adjust the deviation on your transmitter under test as required to meet its specifications.
14. If a CTS or DCS codes are being used with transmitter under test, it is important to
Property of Ramsey Electronics, Inc.
adjust the CTS or DCS signal levels first since these signals will be added to the voice
and will increase the overall deviation.
Note: For AM Transmitter Frequency Error, Power, and Percent of Modulation Measurements
Do not reproduce or distribute.
use the same procedure but substitute:
Receive
Percent AM Bargraph for ± 6 kHz FM Deviation Bargraph Meter.
Digital Percent of AM Meter for Digital FM Deviation Meter.
Your Notes:
to Zoom the Frequency Error meter to the entire RECEIVE screen.
key and select either the ± 6 kHz FM Deviation Bargraph Meter or the
for function key
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