KALMUS ALA500H
R.F. POWER CONDITIONING SYSTEM
(A Commercial/Military Broadband Linear R.F. Amplifier)
- Shown here in the basement shack, workbench area, with the E.F. Johnson
low pass filter installed on the output
- the frequency range is 0.5 to 50.0 Mhz, driving power requirement
is 1 (one) RF volt into 50 ohms. The meter on
- the power supply deck
(lowest) monitors switch selectable collector currents and voltages for the
active RF devices.
- The maximum power output I measured with 1 RF volt input was 510 watts
of (CW) carrier output, into a dummy
- load, through a Bird wattmeter.
- The amplifier deck (middle section) has air intake on the front (large
black rectangle) and a pair of large fans on the
- back of the deck for cooling. The noise level is not overly bad, but
could be better.
- The exciter input
and control deck (top) has provisions for, input RF gain, automatic level
control (ALC), RF blanking
- and a built-in Wattmeter, which measures forward and reflected power.
There is a thermal sensor with shut down
- control for over temp, and a reset button to clear problems after
the thermal trips.
- I am anticipating, driving this amplifier with a Central Electronics
model 10A exciter, and
will probably only use it
- in the CW mode, as I have run out of 458 VFOs, I only have two vfos and
they are in use elsewhere.
