How to Guide

Using Satellite Diplexer DPL2 as a Power Inserter for Remote Power Installations
Applies to CDA4, CDA8, and Similar Competing Distribution Amplifiers
The CDA4 and CDA8 Distribution Amplifiers, as shipped, include a power supply and a 3’ coaxial cable for
powering the amplifier when it is near to a standard household power outlet. The instructions included
with both products provide additional details regarding remote powering of the amplifier utilizing a
“Power Inserter”. Power inserters, as an individually purchasable product, are challenging to locate
online and are non-existent in retail stores. However, a basic TV/Satellite diplexer such as the Antennas
Direct DPL2 (or similar) works perfectly for this application.
Connection of the DPL2 is simple. Connect per diagram below:
Questions:
Q. Can a splitter with a single DC pass-through port such as the SPT2, SPT3, or SPT4 be used?
A. Yes, but. There will be a corresponding attenuation of the amplifier’s output signal equal to the
splitter’s insertion loss. Perhaps useful in a pinch, but the DPL2 will be a far better choice.
Q. Can an “all-port” DC pass-through splitter sold in retail stores labeled for TV/Cable/Satellite be used
as a power inserter?
A. Yes, but. Most splitters of this type have internal “diode steering” of the DC power and the diodes
are installed for use with older satellite hardware so that any receiver can power the circuitry at the
dish. These splitters will indeed power the remote amplifier although with the same signal attenuation
noted above. If a splitter is found that does not have the steering diodes, you’d need to install DC blocks
on any other outputs to prevent damage to other receiving equipment.