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LP-PAN Hardware Installation
Basic Interconnect Diagram

This graphic shows one of the most common LP-PAN configurations.  Other popular rigs are interfaced similarly , such as FTdx3000/5000, although they use an RCA connector for the IF output. The FT950/2000 is similar except that it requires a 3rd party interface board (IF-2000 from RF Space) to be mounted in place of the DMU interface board in the radio. The IF-2000 in this case provides the IF output jack. Older Kenwoods have an IF output, but will require an RS232C “level converter” to provide a serial port.

The sound card shown is the Asus Xonar U7, but the U5 is similar and a little cheaper. The only difference in terms of hardware is that the input and output jacks are on the back of the U5. They are labeled with a microphone icon for input and a headphones icon for output. The control panel selects whether the input will be mic or line level, and whether the output will appear as headphones or speakers.

Connect the system as shown using the following cables…
K3... IF – 50 ohm jumper cable with BNC male connectors on both ends, typically RG-58U.
FTdx3000/5000... IF - 50 ohm jumper with male BNC to male RCA connectors.

Audio – Y cable with 1/8” (3.5mm) stereo connector on one end and 8” mono connectors on the other end. These can be homemade, premade or made up of a combination of premade cables and adapters. A common configuration is Y cable with stereo 1/8" (3.5mm) on one end, and red/white RCA connectors on the other end. Adapters are used to convert the RCAs to 1/8" (3.55mm) mono.  NOTE: L / R cables need to be swapped for FT950/2000, or the "Swap I/Q" checkbox on the input tab in NaP3 needs to be checked (the IF-2000 boards flips the sidebands).

Power -  Use the cable supplied with LP-PAN 2 (2.5mm plug). The end with tinned wires should be connected to a suitable source of regulated 12VDC with the same ground as the rig. This can be obtained from the switched 12V output of the rig. The “+” lead is marked with a white stripe.

RS-232C... Connect to a serial port  on your PC, or to a USB to serial adapter. We recommend adapters which use FTDI chipsets. We recommend against adapters which use Prolific chipsets.

USB – Use cable supplied with sound card. Connect to USB 2.0 port on PC. Using USB 1.1 is permissible, but will limit bandwidth to 48 kHz. If you must use a hub, it should have its own power supply and be USB 2.0 compliant.

Headphones/Powered Speaker – Requires 1/8” (3.5mm) stereo plug. It is smart to use speakers with a volume control, even though the U7 has its own volume control, and NaP3 has volume sliders. Headphones can be anywhere from 8 to 64 ohms. The U7 control panel allows you to select a matching impedance. The main rcvr in NaP3 feeds the left channel and the sub rcvr feeds the right channel.

Return to LP-PAN 2 Installation 1-2-3

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