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Frequency tuning (FT)
FT (Frequency Tuning):
FT is designed to minimise problems with interfering RF frequencies by moving the frequency of the receiver to a more optimal
placement relative to the interfering frequency. FT cannot alleviate problems if the interfering RF transmitter is sending on the
same frequency as the handsets.
The FT has three frequencies it tries out: The centre frequency found during the PCB-test, a frequency a bit lower and one a bit
higher. The two last frequencies are found by empiric testing of a number of units trying to find the optimum frequency that
gives least interference but still adequate reception. It takes approx. 7 seconds to complete the FT.
How to activate the FT:
The FT can be activated at any position of the TWINDRIVE
®
TD.
1. Check Software and Hardware version according to above specification
2. Check that FT is enabled in the configurator, always enabled with standard configuration of TD3.
3. Be sure that the TD is connected to the mains
4. The HB has to be paired to the TD
5. Test and check that the TD can run when the HB is close to the TD (0-30 cm). Only to be sure that the TD and the HB is paired.
6. The optimum frequency is achieved when the handset can just barely activate the TD.
7. Activate FT by pressing two buttons on the HB at the same time: backrest up and backrest down. These buttons must be
pressed during the entire operation for the FT to be successful. Keep the keys pressed, the frequency is now stored in the unit,
otherwise the FT returns to the last stored frequency. Keys have to be pressed for at least 7 seconds. It does not matter
that the keys are pressed for a longer time.
Return to factory setting
Push shortly on the reset button. Do not push on the HB button.
Please observe:
• Should the FT see another key-press from the same handset (e.g. the user has released one of the two buttons) the FT
immediately terminates and the system returns to normal operation on the old selected frequency.
• Should the FT lose connection to the HB it will still continue scanning as the reason could be because the currently scanned
frequency is simply too bad for reception.
• The FT can be restarted again at any time by the user and can be disabled completely by configuration of the TD3.
• If the FT is disabled and a manual frequency has been entered, the system cannot be returned to centre frequency by pressing the
reset button.
• If the FT somehow has selected an even worse frequency than centre-frequency (e.g. because the interfering frequency has
moved) and the FT can no longer be activated (because the unit cannot see any RF), the FT can be returned to centre-frequency
by following the procedure for pairing handsets. It is not necessary to actually re-pair the handsets, simply press the reset button
shortly while ready for re-pairing is enough.
HB12RF
HB22RF
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