The QLF filter is very simple to operate.
- Auto Speed Tracking Mode
When the QLF filter first powers up, it is in
auto speed tracking mode.
The filter monitors your dit and intra-dit
spacing to determine the current speed. Based on changes to
your dit length, spacing, and dash length, the speed is
gradually modified. Changes to the speed is best achieved
by sending a series of "V"s. The QLF filter will quickly
adjust to your average fist speed.
- Speed Locked Mode
The code speed can be locked by sending 11 consecutive dits.
The Lock LED will come on to indicate
this mode. All code timing will remain at this speed until the
unit is unlocked. This is done by sending a dash of about 2.5 to 3 seconds.
The Lock LED will go off.
- Pulse LED
Provides a visual indication of the current working speed.
- DIT/TRA/DASH LEDs
Provides a visual indication of the transition from dit to dash.
you can watch the LEDs to know when your dashes are properly spaced.
- ERR LED
This indicator will light when your code timing has significant
variations that were not correctable by the QLF filter. This is
truly a QLF indicator, and you should strive to keep this LED off
in your effort to improve your keying technique.