89 FUNCTIONAL CONFIGURATION
Figure 8 on the following page is a simplified block diagram of the ALPHA 89.
1) Principal functional components are emphasized as follows:
a) Heavy rectangular boxes represent individual modules of the amplifier, in most (but not
all) cases circuit boards (PCBs).
b) Signal paths used in both transmit and receive are shown by heavy solid lines.
c) Signal paths used only in transmit, by heavy dashed lines.
d) Signal paths used only in receive, by heavy dotted lines.
e) Internal wiring harnesses are shown as light solid lines. Each is labeled with the
designations of the control, monitoring and power distribution lines which comprise it.
f) Principal interfaces to the outside (connectors & controls) are located around the
perimeter of the block diagram.
2) Transmit signal path: Drive from the transceiver, applied at the TX RF INPUT connector, passes
sequentially through the input wattmeter, tube deck T/R section, input t/r pcb, input matching net-
work, (pair of) 3CX800A7 triode tubes, plate tuning network, dual pin diode pcb, output t/r pcb,
and output wattmeter pcb to the tx rf out/rx rf in jack.
3) Receive signal path: Tx rf out/rx rf in jack, output wattmeter, output t/r pcb, input t/r pcb, tube
deck t/r section, and input wattmeter to the tx rf input jack which is of course also the rx signal output
to the transceiver.
While the complexity of the ALPHA 89 is such that describing its circuitry in detail here is
impractical, one set of schematics will be provided at no charge to any owner on request, and
assistance with specific questions or problems is always available from ETO Customer Service.
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