Operation In Bypass Mode; Changing Frequencies And Antennas - Acom 06AT User Manual

If the conditions at the antenna have changed since the time the tuning was memorized,
using outdated tuning settings may lead to a high SWR at the amplifier end. We
recommend updating the tuning settings with the TUNE button in this case.
For the purpose of quick tuning without CAT, the operator should adhere to the following rules of operation
for frequency and/or antenna change:
- Frequency segments can only be changed during reception using the
buttons or by sending a short preliminary transmission. Start the main transmission after a pause of at least
0.5 seconds.
- The pause between the short and the main transmission is needed so that the amplifier can first
check the new operating frequency and switch its harmonic filters, if necessary, to send a "quick tuning"
command to the tuner (possibly with a new antenna), to evaluate the response from the tuner and to refresh
the onscreen indication.

4.5. Operation in BYPASS Mode

If the operator has chosen BYPASS mode, he takes full responsibility for matching the antennas to the
feedline and amplifier - same as without a tuner in place.
In order to place the tuner in BYPASS mode, the operator should press and hold the TUNE button for at least
1 second. The tuner bypasses the matching network in order to eliminate its action. BYPASS is displayed
onscreen (in front of the frequency).
In BYPASS state, the ANT button is still enabled. The antennas can be switched according to their assignments
in the ANTENNA ASSIGNMENTS menu (see Section
can be used as an automatic antenna switch to select antennas using the antenna assignments by bands or
as a manual switch, if more than one antenna is assigned per band.
The tuner stays in BYPASS state until reactivated by pressing and holding the TUNE button again (1s - Use
ATU). Regardless of whether or not a frequency and/or antenna were changed in the meantime, a new quick
tuning is completed from the tuner memory for the current antenna and frequency in use. If there is no
stored tuning in the tuner memory, the tuner will stay in BYPASS mode until it is tuned.

4.6. Changing Frequencies and Antennas

Changing a frequency segment or band with a respective quick tuning can be performed in three ways:
- Automatically - utilizing transceiver CAT;
- Semi automatically (when no CAT is active) - by a short transmission at the new frequency,
followed by a short pause, during which "quick tuning" will be completed (see Section
).
Non-Volatile Memory
Page 34 of 70 | S e c t i o n STARTING UP AND MAIN FUNCTIONS
User's Manual | ACOM 06AT | Automatic Antenna Tuner and Switch
NOTICE
6.1 ANTENNA ASSIGNMENT Menu
SEGMENT or SEGMENT
). In this mode, the tuner
4.4 Quick Tuning and
October 2022