User Manual

System Components
Power Supply
The power supplies are switch mode type supplies. Depending on the
requirement, it is capable of supplying 40 amps of DC current at 28 VDC from
115 or 220 VAC line voltage. Each supply is made up of four 28 VDC
modules. The modules are assembled in parallels to meet the desired
current rating. Each module is individually fused and contains its own
temperature controlled fan.
The supply is protected against overload and short circuit conditions by fold-
back current limiting. The load is protected against over voltage by a
“crowbar circuit” which initiates latched current limiting upon over voltage,
dropping the output voltage to safe levels.
Power Amplifier – Installation
Equipment Required: Wattmeter with RF sample output, Spectrum Analyzer
and Oscilloscope.
Please read and follow instructions carefully before installing the Power
Amplifier.
1. Upon removing the unit from its package, it should be inspected for
any obvious signs of physical damage and loose hardware. If there is
damage, call Eagle to obtain a RMA number to return the unit.
2. Verify that all cabling and DC power connections are in place. If not,
tighten any screw or cables that may have come loose during
shipment.
3. Connect a known good Isolator/Circulator to the RF output of the unit.
4. Connect a known good dummy load to the output of the
Isolator/Circulator with a wattmeter in line between them.
5. Connect the Power Amplifier unit to a correct ampere rated AC outlet.
For most applications 10 amps rated outlet will support a 250 watt
system.
6. Turn power on. The system will perform its internal diagnostic tests,
the HI VSWR and the HI TEMP LED will blink sequentially for about 22
seconds and then stop with both HI VSWR and the HI TEMP LED off
and a “CPU OK” green LED will blink in the PA control board at the
rate once every second. The system is now ready for operation.
7. Check DC voltage at the DC power input terminal located at the rear of
the transmitter unit. This should be at 26 volts.
8. Check that the exciter output is correctly adjusted to meet the input
power requirement (the maximum input power requirement is shown
either at the front or back of the unit) of the PA and the spurious and
harmonics from the exciter should be at 65dBc or better.
Version 3 3-16 07/18/01