Acom 1000 User Manual page 20

The amplifier can operate safely as long as the REFLECTED POWER is LESS THAN 300W. Also, impedance
matching is assured for loads presenting a VSWR of up to 3:1. Although for some loads and bands,
matching is possible at even higher VSWR levels, the drive power must be reduced to prevent the
REFLECTED POWER from exceeding 300W. Failure to comply with these guidelines will cause the
**REFLECTED POWER** soft-fault protection to trip.
For example, if the antenna VSWR were 4.5:1, the maximum attainable forward power would be 750W,
300W of reflected power and real output to the antenna of only 450W. In the event your antenna cannot
be adjusted to produce a lower VSWR, an external antenna tuner may be deployed.
Внимание!
Danger!
Using a feeder of coaxial cable at VSWR > 3:1 on HF, and particularly on the 10- and 6
meters bands, is not recommended. At such high values of VSWR, the high voltages,
high currents, and heat associated with line losses, risk to permanently damage your
coaxial cable or antenna switch.
Update tuning periodically, even if you have not changed band or antenna, in particular when a significant
change in the environment occurs (snow, ice, newly appeared or removed massive objects, alien wires
nearby etc.) that would cause significant changes in the antenna impedance.
Забележка!
Note!
If you use more than one antenna per band, it is necessary that you select the proper
antenna BEFORE the next step. Retune after selecting a different antenna for the same
band, since both impedances may differ substantially (unless their VSWR is excellent,
i.e. below 1.2:1 for both).
Do not switch the BAND switch knob while transmitting with the amplifier! Hot
switching (while transmitting) will eventually destroy the band switch, not covered by
the warranty!
When tuning, do not apply continuous drive longer than 3 minutes and after that pause
1-2 minutes for tube cooling.
Page 20 of 36 | S e c t i o n OPERATION
User's Manual | ACOM 1000 | HF + 6m Linear Amplifier
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August 2020