H A R D W A R E I N S T A L L A T I O N C H A P T E R 1
(4) Headphone Jack
Accepts headphones with standard 1/4” stereo (TRS) plug. Recommended ratings for headphones are
40 mW into 16 Ohm load (typ) with a 1% THD+N. Higher impedance headphones will also work.
Note: Lower impedance headphones and headphones using a mono plug
can result in popping audio as soon as PowerSDR is started.
Back Panel
(1) 13.8 VDC Power Socket
The FLEX-3000 requires a stable 13.8 VDC power source rated for at least 20 Amps and 25 Amps peak
for proper operation. Supplied with your radio was an unterminated 4-pin keyed Molex type power
connector and cable set. Terminate this cable in the appropriate connector (if needed) for your DC
power source such as Anderson PowerPoles®, banana plugs, spade or ring lugs, or tinned ends for
screw terminals. Connect the 2 red wires to the positive terminal and the 2 black wires to the negative
terminal of your power supply. The Molex type connector is inserted into the white Molex receptacle
labeled -13.8 VDC+.
(2) RF Ground Terminal
Connect to the single point ground system in your shack. Alternatively, if you have no single point
grounding system, ground the FLEX-3000 to the metal chassis of your computer with a low impedance
ground strap, such as a 1” braid or copper strip (the screws that hold the computer power supply in
place make an excellent grounding point).
(3) Antenna Port
Connect a 50 Ohm antenna or dummy load to the BNC antenna port. Alternatively the internal antenna
tuner can be used to match an antenna with a different iimpedance.
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5 2003-2009 FlexRadio Systems
Figure 3: FLEX-300 Back Panel
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