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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 2 - INSTALLATION, SETTING UP AND FIELD VALIDATION 2-17
RESTRICTED FREQUENCIES
2:59. Refer to the frequency authorization operating license obtained for the sounder at the installation site
and note any frequencies to be protected. The restricted frequency intervals are stored in stationSpecific.udd
file in the /digisonde/dispatch folder of the Data Platform. Restrictions for both ionogram and drift meas-
urements can be specified by use of the parameter numbers *946 and *961 respectively. Separate lists of re-
strictions for ionogram vs drift measurements were implemented due to the difference between the two
measurements’ dwell time. Typical ionogram measurements remain sounding on any one frequency for less
than one second, while typical drift measurements may remain on any one frequency for tens of seconds.
This separation of restrictions allows the user to specify additional restrictions for the drift mode, if neces-
sary, since the likelihood is somewhat greater that it would be detected by another HF user. Restrictions are
specified as the lower end and upper end of each frequency band to be avoided during transmission. When
specifying restricted frequency bands the system theoretical bandwidth of 30 kHz should be taken into ac-
count; increasing the band size by 15 kHz on both the lower and upper bounds. Further increasing the band
size pushes the closet sounding frequency further away from the band restriction, which further decreases
the amount of energy put into the restricted band. The bands are comma-separated; multiple *946 lines can
be provided in one file, e.g.:
*946 < 40000-45000, 70000-75000 >
*946 < 81500-82150 >
SUMMARY OF STATION PERSONALIZATION SETTINGS
2:60. Table 3-2 summarizes all station-specific configuration items that need to be personalized for the
sounder.
Table 3-2: Site-specific configuration items to personalize for DPS4D
DCART: tagging of data files
See Section 5 for description of other DCART options
Ionogram restricted fre-
quencies
Drift restricted frequencies
Station UDD file
(xxx.UDD)
DCART, ARTIST 5, DFT2SKY, TILT, DRGMaker,
online image tools, SAO Explorer
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