Specifications

2
DOCNUMBER 9500
Document Issue 1, Revision 7
June 2009 Page 2–5
Alpha Radio Products Alpha 9500 HF Linear Amplifier Operating Manual
Product Release 1 Amplifier Components
2.5 Display Board
The display board is the largest board in the amplifier and spans the entire
inside front panel. It has three microcontrollers, one each to control the
stepper motors; the LEDs and 7-segment display and push buttons; and
the sound controller.
2.6 Firmware
The ALPHA 9500 firmware revolves around the Inter-IC (I2C) bus,
developed by Philips for the control of medium-to-high-scale consumer
electronics. This bus allows a master controller to communicate with a
number of slaves.
A single master communicates rapidly and bidirectionally with a number
of slaves, each of which performs a subset of the task required to make an
operational amplifier. Each slave is independently addressable.
MEMORY Selects one of three sets of segment memories:
•
DEF — factory-default settings and user memories
•
1 or 2
•
AUTO — autotune
ON (AMP) Turns the amplifier tube and voltage on.
ON/OFF (ANT SEL) Turns the antenna select on; the amplifier tube is not on.
OPER Sets the amplifier to the operate position.
PEP Toggles between PEP mode and carrier/tune mode.
PLATE CURRENT meter Displays the plate current in milliamperes (mA).
PLATE VOLTAGE meter Displays the plate voltage in volts (V).
RCL (Currently nonfunctional)
RF POWER kW meter Displays the forward power in W.
SAVE Saves the current settings.
SEGMENT Selects different frequencies within each band.
SND Controls the sound volume (not yet implemented).
STBY Sets the amplifier to standby (bypass).
SWR meter Sets the 7-segment display to show SWR.
TUNE (UP or DOWN) Controls the tune capacitor.
Vp Sets the 7-segment display to show plate voltage in V.
Table 2-1 Amplifier Buttons (listed alphabetically)
Button Purpose