switching. ! tone segment
3. A sequence containing 5 segments to be run manually to test a filter having a response
of -5.7dB at 1kHz, 0dB at 2kHz, +3.0dB at 3kHz, +6.0dB at 5kHz, and +2.3dB at 10kHz:
!1000,,+5.7 !2000,,0 !3000,,-3 !5000,,-6 !10000,,-2.3
Note that the duration defaults to 0 in each case so each segment will hold the tone after it
has been run. To use this sequence press
followed by the sequence number to
obtain the
SEG? prompt. Pressing 1-5 now will generate the appropriate frequency and
level to give a 0dB output from the filter. Because all the tone durations are zero it does
not make sense to run this as a whole sequence. If, however, the tones are defined with
duration 1s, and made to hold after the segment has finished, the sequence could be run as
a whole and would last 5s and still allow each segment to be run individually:
!1000,1000,+5.7,,0 !2000,1000,0,,0 !3000,1000,-3,,0 etc
If more tones are required segments 6-10 can be defined or other sequences can be used.
4. A repeating segment to generate ‘the Greenwich time signal’ every 10 seconds:
!1000,100,0,0,900,,1000,100,0,0,900,,1000,500,0,0,7500,,<
Two tone bursts of 0.1s followed by 0.9s of silence and then a long tone burst of 0.5s
followed by 7.5s of silence. The ‘<’ character causes the segment to repeat indefinitely
(see section 4.17). Hold
to stop it.
5. To generate 110 baud 7 bit FSK characters ‘L’ (binary 1001100) and ‘C’ (binary
0100011) by generating the tones for each bit. The actual bits (including start, stop and
parity) are 1100011001111011000011:
!1650,20,0,1850,27.3,,1650,18.2,,1850,,,1650,36.4,,
1850,9,,1650,18.2,,1850,36.4,,1650,18.2,
This could be used to test FSK decoders operating at other baud rates, but would not
normally be used to generate FSK within a Lindos sequence.
6. To simulate the W&F test segment with a -3.8% speed error. FSK ‘W’ followed by
3005Hz for 12.5s.
!W3005,12500,0
7. A segment containing the 20 frequencies printed in the table for sweep segment U with
compatible timing (ie a frequency sweep containing 20 frequencies instead of the usual
320):
! tone segment
!U30,523.4,,40,168.7,,50,161.7,,63,182.8,,100,267.2,,125,218,,
250,450,,500,450,,1000,450,,2000,450,,4000,411.3,,6300,260.2,,
8000,147.7,,10000,137.1,,12500,144.1,,14000,63.3,,15000,42.2,,
16000,45.7,,18000,98.3,,20000,328.3
80
4. User Defined Sequences
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