LDI DIGISONDE 4D - Auto-Drift Message Packet Type=0 X33, Length = 25; Clean Restricted Frequency Interval List Packet Type=0 X78, Length = 0; Global Parameters Packet Type=0 X85, Length = 3; Load Restricted Frequency Interval List Packet Type=0 X77, Length Is Variable

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 5 - SYSTEM SOFTWARE – ANNEX B 5-57
Load Restricted Frequency Interval List packet TYPE=0x77, Length is variable
5:131. The packet is used to set list of restricted frequencies. DESC should not transmit on these frequencies
but still collects and reports data.
Table 5B- 7: Load Restricted Frequency Interval List packet TYPE=0x77, Length is variable
Byte
Offset
Byte
Len
Mnemonic
Description
Units
Type
Range
0
RFIL
LEN
RFIL
Restricted Frequency Interval List (Table 5A-
17)
-
RFIL
struct
Clean Restricted Frequency Interval List packet TYPE=0x78, Length = 0
5:132. The packet is used to clean list of restricted frequencies.
Reboot TYPE=0x79, Length = 0.
5:133. The packet is used to reboot Control computer.
Auto-drift Message packet TYPE=0x33, Length = 25.
5:134. The packet is used to set new recommended frequency in the auto-drift programs on the DESC com-
puter. Two frequencies are available in the packet, FR1 for F layer, and FR2 for E layer drift. The appropriate
frequency is selected by comparing height parameters HR1 and HR2 that accompany frequencies FR1 and FR2
with the bottom-top settings on the auto-drift programs. If the height parameter is within the bottom-top range
of the sounding operation and time is not more than 1.5 hour from current time than DESC replaces the nomi-
nal fixed frequency value in the program specification with the new recommended value from the packet.
DESC attempts to set FR1 using H1 and after that FR2 using H2.
5:135. Heights are given in the units compatible with bottom-top range fields of the sounding operation.
Table 5B- 8: Auto-drift Message packet TYPE=0x33, Length = 25
Byte
Offset
Byte
Len
Mnemonic
Description
Units
Type
Range
0
Time
LEN
TS
Time Stamp (see Table 5A- 13)
-
17
2
H_F-LAYER
Height range one (F layer, range 80 is 100 km)
1.25
km
INT16U
0 km – 2000
km
19
2
FR_F-
LAYER
Recommended frequency for drift measurements at HR1
0 = no recommendation available
kHz
INT16U
0, 1 kHz –
30000 kHz
21
2
H_E-LAYER
Height range two (E layer, range 160 is 200 km)
1.25
km
INT16U
0 km – 2000
km
23
2
FR_E-
LAYER
Recommended frequency for drift measurements at HR2
0 = no recommendation available
kHz
INT16U
0, 1 kHz –
30000 kHz
Global Parameters packet TYPE=0x85, Length = 3.
5:136. The packet is used to set global parameters on the DESC computer. Packed must be send at DCART-
DESC reconnect, and at Global Parameters change.
Table 5B- 9: Global Parameters packet TYPE=0x85, Length = 3
Byte
Offset
Byte
Len
Mnemonic
Description
Units
Type
Range
0
1
DELAY_0_K
M
Delay for 0 km (from beginning of R-Pulse) depends on
receiver script.
1.25
km
INT8U
0..255
1
1
DELAY_80_
KM
Delay for 80 km (from beginning of R-Pulse) depends on
receiver script.
1.25
km
INT8U
0..255