5.8 Antenna coupler, AT-1560
5-47
Timing of control signal
Tuning is made by receiving “TUNE” signal. Fig.5.8.2 is the timing chart for generating
TUNE OK signal. When tuning is made successfully, TUNE OK (H) signal is generated.
If not, TUNE ERROR (L) signal is generated. Pressing TUNE switch, S3 also tunes the
antenna matching circuit.
Fig.5.8.2 Timing of control signals
TROUGH signal
“Through signal” is used to decide whether the receiving signal bypasses the antenna
matching circuit or not.
When COUPLER THROU in the RT system setting menu is set to “DIFF”, and the
transmission frequency and the receiving frequency are different, the receiving signal
bypasses the tuning circuit;
1) If the receiving frequency is 1.6 MHz or less.
2) If the receiving frequency is less than 4 MHz and different from the
transmission frequency.
3) If the receiving frequency is 4 MHz or more and different 1.2 MHz from the
transmission frequency.
4) During the RT scanning.
Generally, when the transmission frequency and the receiving frequency are different,
the receiving signal does not pass through the matching circuit so that the signal is not
attenuated.
(from FS-1570T/2570T)
(to FS-1570T/2570T)
(from FS-1570T/2570T)
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