INDEX Page. 26 of 89
the tuner input where the load resistance is always constant (50 ohm).
Do not expect external power meters to match the displayed power.
It should be understood that an external measure of power might be lower depending
on the matching attenuation.
Note: Sometimes, especially in the low or high frequency bands , even if the cable/antenna
mismatches are lower than the declared maximum, it is not possible to reach an
acceptable match.
This is technically explainable with the help of Smith's chart where it appears that the
values of R and X for a certain SWR values are infinite, some of which are not
technically practicable for the ATU.
This is evident by going into the MANUAL MODE and verifying that C and/or L are at
the ends of their possible values.
Note: ATTENTION: When the amplifier is either in the “STANDBY” or in the “OPERATE”
mode, always disable the automatic tuner in your transceiver.
Note: On the display, next to the number of the antenna in use, the following indications may
appear.
Below identifies those meanings (see specific chapters):
"b" = ATU bypassed.
"t" = tunable antenna.
"r" = receiving antenna.
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