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and failures. A remote power source of +13.8 Vdc minimum may be used. Alternatively, the RPA-
2 may be powered over the coax. See “
Powering Through the Coaxial Cable
”.
Power Connection
The RPA-2 requires a well-fi13.8 to +18 Vdc @ 140 mA source with a negative ground
.
Many inexpensive wall mounted transformer DC supplies are not 'clean' and have RF noise
components on their DC output. Place the fuse at the power supply, rather than at the RPA-2.
The RPA-2 power connector uses a positive locking threaded 2.1 mm barrel
type plug (included). When plugged in, tighten the connector by turning
clockwise. This prevents the power connector from coming loose. To
remove, turn the connector counterclockwise. You should use a well
reg13.8 Vdc supply. Another well regulated source can be used as
long as it su13.8 to +18 Vdc, negative ground, the power plug center is connected to
positive and has an inline 1A fuse. When power is applied to the RPA-2, the green LED will
illuminate. A standard 2.1 mm power connector with center positive and +13.8 Vdc supply may be
used. Do NOT use a wall transformer, they are inherently noisy.
ATTENTION!
Be sure the power supply polarity and voltage level are correct.
Opening the RPA-2 unit
To open the RPA-2 unit, remove the six Phillips head
screws and the case will come off exposing the interior
printed circuit boards. The top slot has a By-Pass Board
installed and the bottom slot has the RPA Printed Circuit
Board installed.
View looking from the rear of
the RPA-2 with the cover removed.
Powering Through the Coaxial Cable
The
RPA-2 has a three-pin internal jumper header
labeled
HD5
. The
factory default
(as shown)
has the
jumper installed onto the lower two pins of HD5
.
With
HD5
in the factory default position, the DC
power connected from the units 2.1 mm connector
labeled “
POWER 12 Vdc
” feeds the internal RPA-2-
PM Receive Preamplifier Plug-In Module and another
optional board, as needed.
