Radio Alpha Products Inc. ® Alpha 99
19
NOTE: Do not operate amplifier without the cover in place and all
cover screws installed. Do not operate amplifier without a good RF
ground connection on the rear panel ground terminal.
Power Cord Connections
WARNING!
To avoid the hazard of a potentially fatal electric shock and/or severe
damage to the ALPHA 99 and other equipment, always use an AC
plug that is appropriate for the primary mains voltage, current rating
and configuration. NEVER use 120V-type plugs and power
receptacles for 190-250V circuits.
ALWAYS use grounding type AC connectors which conform to local codes and
ensure that the green wire in the Alpha 99 power cable is wired only to the AC mains
safety ground (or to neutral, as may be necessary with a 240V circuit configured 120V-
N-120V without a separate ground, commonly found in the US).
The green conductor in the power cord is wired to the ALPHA 99 chassis. It MUST
be connected only to the power source safety ground or neutral. The black and white
power cord wires connect to the two “hot” wires of the AC source; either wire may be
connected to either side of the line. For best results use a dedicated 200-240V branch
circuit of #10 AWG copper wire or equivalent, rated at 20A, to feed the amplifier.
Important information concerning operation from 90-130V AC
Electrical power equipment will draw twice as much primary current from 120V mains
as from 240V mains. Therefore, operating the ALPHA 99 on a typical 120V/20A
household circuit without exceeding the 20A circuit rating will limit maximum peak
power output to about 600-1000 watts. Maximum possible RF output power for any
particular primary AC voltage and current capacity may be estimated as:
Po max = (V
LINE
x I
LINE
) / 2.3.
For example, if the Alpha 99 operates from a circuit which is capable of delivering
115V AC at a maximum current of 20A, with no other loads connected to the circuit,
maximum peak RF output possible without tripping the 20A breaker (or fuse) is
approximately:
Po max = (115V x 20A) / 2.3 = 2300/2.3 = 1000 watts.
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