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6. Front panel operation
POWER
After switching the "POWER"-switch to ON, the amplifier will be turned on. This is
indicated by the green "ON"-LED. It takes approx. 5 seconds until the internal supply voltage
rises up to 50 VDC and releases PTT operation. The HLV-2000 has an integrated pfc-
controlled switched power supply with an efficiency of > 96%. The total mains power
consumption @ 2.000 watts into a 50 ohms load is <2.900 watts.
PREAMP
When pressing this switch to ON, the integrated sequencer enables trouble free operation with
external high quality pre amplifiers This is confirmed by the illuminated yellow "Preamp"-
LED. This sequencer control circuit activates the RF-power unit after turning off the
preamplifier. When returning to receive, it turns the preamplifier on after switching off the
RF-power unit. The supply voltage for the use of an external preamplifier is available on pin 4
of the "CONTROL"-jack at the rear panel. It is short circuit protected by use of a ptc-fuse and
supplies 15 volts/ 750 mA. Preamps that only can accept voltage feed via the coaxial cable,
can't be used with this amplifier.
STANDBY
If the "STANDBY"-switch is pushed, the RF-unit is turned off while keeping the amplifier
still turned on but with an RF bypass condition from input to output. This condition is
indicated by the illuminated yellow "PAOFF"-LED. While in STANDBY, the sequencer and
preamp control (If the preamp switch is ON) functions of the amplifier continue to operate
normally. When the PTT line of the amplifier is grounded, the preamp voltage will be
dropped and the AUX jack will go to ground.
RESET
8
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