User Manual
CO1-2 Combiner
Page 30 of 36
4.2 Set-up of the ATU.
For bands where the ATU is not bypassed, complete the programming in accordance
with the respective antennas.
Proceed in an orderly fashion for each antenna, sub-band for sub-band; it is strongly
recommended to exercise maximum accuracy, not to limit only to the transmission
frequency of the moment.
Tuning all the antennas in all the bands available will maximize the benefits of all the
automatisms offered by the linear.
Proceed as follows:
1) In the table (see chapter "19. TABLE" of the amplifier manual) read the
center frequency of the sub-band to be tuned and set it on the transceiver.
2) Press the [TUNE] key of both the amplifiers or the corresponding key in
the keypad for common commands (see chapter 6).
3) Switch to transmission with the exciter in RTTY or FM; the two ATUs will
move separately and independently until they stop at the SWR minimum for
both.
In some cases the adjustment can be improved by starting again from point
2) or by going to "MANUAL TUNE" (very rare case).
4) Repeat the previous points for all the sub-bands of the band, including, if
possible, the two sub-bands immediately outside the same band.
5) Repeat the previous steps for the other antenna of the same band (if
present), after having selected it with the [ANT[ key.
Note: If the ALC connection is not used, it is advisable, during this operation, to set the
power of the transceiver to approximately 60/80 Watts.
Note: Although the ATUs of the individual amplifiers have the ability to overcome high
SWR rates it is advised, given the powers involved, not to work with SWR > of 1: 2.5.
