Elecraft KX3 Mobile Installation And Operation Guide - Manual (Page 8)

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Figure 3. Wiring Diagram: Example of KX3 and KXPA100 power and antenna cabling.
Figure 4. Relay and interconnection schematic.
In Figure 2, take a close look at the KX3’s DC power input. The DC to DC converter shown eliminates
whatever power impurities remain at this end of the interior DC branch circuit. Being a boost‐buck
regulator, the converter can accept a wide range of input voltages and produces a steady 13.8VDC
(adjustable). The converter used in this example installation is made by QSKJ (model QS‐1212CCBA‐
80W). In addition to cleaning up the DC, the converter reduces voltage sag from the smaller gauge
interior wiring. In order to prevent the converter from introducing its own emissions, a Laird LFB174095
ferrite core was used with 3 turns of the KX3’s stock cable. This killed all converter emissions.
See
http://ca.picclick.com/DC‐DC‐Converter‐QS‐1212CCBA‐80W‐Power‐Supply‐251036051706.html .
Cabling Like A Pro
If you take time to plan your cabling carefully, power and antenna cables will be visible only at the KX3,
under the hood [bonnet] when it’s up, or in the trunk [boot]. The idea is to keep your car or truck
interior looking uncluttered. If you don’t care about cable placement you may ignore this section. Some
people are neat freaks, others aren’t.
There are numerous useful tricks in performing a pro installation. We can learn a lot from mobile audio
installers on this, taking advantage of the fact that there is a general trend to install monster audio gear.
Many vehicle audio systems involve placing a high‐power amplifier in the trunk, with a head‐end unit in
the cab, and heavy power and speaker cabling in between. That same placement concept can be used
for the KX3 and KXPA100.