FLEX-6400/FLEX-6600 Hardware Reference Manual
Page 44 of 45
Copyright 2018 FlexRadio Systems. All Rights Reserved.
15 CALIBRATION
The FLEX-6400/FLEX-6600 is extensively calibrated, aligned and tested as part of the
manufacturing and quality assurance processes. In general, there are a limited number of
hardware calibrations that can be performed by the user, but the ones available are listed
below.
15.1 FREQUENCY CALIBRATION
The FLEX-6400/FLEX-6600 incorporates high-quality low phase noise TCXO for frequency
accuracy and stability. However, oscillators undergo a slow gradual change of frequency
with time, known as aging and may require periodic frequency calibration using a known
frequency standard.
The FLEX-6400/FLEX-6600 without an installed GPSDO can be calibrated by the user
utilizing the automated routine provided in the SmartSDR for Windows client software.
Before running this calibration routine, allow for the radio to temperature stabilize for at
least 30 minutes before calibrating the frequency. The calibration routine will
temporarily use Slice A and ANT-1 to receive over the air signals from a known frequency
source, such as WWV or CHU. Also, refrain from frequency calibrating the radio in
extremely high, low or fluctuating ambient temperatures as this will introduce error into
the calibration process. Please refer to the SmartSDR Software User’s Guide for detailed
frequency calibration instructions.
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