• 80Hz: Total 80-column screen width, in Hz. In this case an 80 Hz wide screen means each
block is a 1 Hz Waterfall bucket
• /10Hz: Hz per horizontal division. There are always 8 horizontal divisions on the screen.
This parameter displays the number of Hz per division.
• 160ms: the update rate of the screen, or put another way, time per horizontal scroll row.
• /2s: The time per vertical division of the screen (distance between the horizontal blue dot
grid lines)
• FT8: The mode matching this update rate; various popular modes coded and when an
update rate matches a mode, the mode name is written here. See below for the list of
supported update rates.
• 1510: Center frequency of the waterfall
• 1512.35: The most recent frequency measurement
NO SIGNAL: displayed at the top right when no audio signal is detected
PAUSED: displayed at the top right when the screen is paused by the space bar
NOTE: At very fast update rates, which are useful for displaying some features, the screen update
is too slow to display all the information and still be capable of updating fast enough. Therefore
information is dropped. At 20ms per row (50 row updates per second) the only text on the display
is “20ms” in the top left corner; the grid lines are still displayed. At 10ms (100 row updates per
second), even the grid lines are dropped; only “10ms” is written in the top left corner, and the
yellow block drawn for the measured frequency.
Update rates:
The available update rates (selected by the up/down arrow keys) are chosen to match various
popular modes. For example, the symbol duration for FT8 is 160 ms. So “FT8” is written next to
the vertical division rate, on the top row of the display.
Update
rate (ms)
vertical
Div (s)
Matching
mode
Comment
10 1 Only display “10ms” in top left
20 1 Only display gridlines and “20ms” in top left
40 1
80 1
160 2 FT8
227 2 JT4
361 5 JT65
576 5 JT9
683 5 WSPR
QMX operang manual; rmware 1_00_012 79
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