Page. 22 of 87
6. ANTENNA
Because this is a high-power amplifier, it is necessary to use properly rated antennas,
connectors and feed line cables.
Take special care with antennas using baluns and traps, because balun and/or trap
warming can occur during periods of high-power transmission and a high SWR most
likely will result.
This dangerous situation is often not perceived by the operator because normally a
measure of SWR is made when balun and antenna are not under stress or have cooled
down. Ensure that your baluns or antenna traps are appropriately rated !
A unique feature of this linear is that, it not only measures the SWR after the band pass
filter matching, but also the SWR of the system antenna and cable. This allows you to
always evaluate your antenna system despite the matching and the power applied.
Without the ATU (option), always use antennas having SWR of 1.5:1 or less.
With the ATU, the amplifier is able to overcome some mismatches of 3:1 SWR or more.
Be aware that, with the tuner, the PA is matched but with a high VSWR the cable is
mismatched and there can be consequent loss of power, heating and high voltages
present.
Always operate with the best possible matching because, despite the amplifier’s
protection against high SWR, continuous use into a mismatched load (a bit lower than
the protection threshold) may lead to damage.
It is suggested that suitable static protection be given to antenna feeder cables.
The software allows you to select up to two antennas for the same band.
Note (for amplifiers without ATU): For a mismatch from 1.7:1 to 2:1 there is an alarm, above
2:1 the amplifier is automatically switched to STANDBY.
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