|Display shows noise but no signals
||Check audio and RF cabling.
Make sure the correct sound card and driver are selected in NaP3.
For Yaesu rigs, make sure the IF output is turned on in the menus.
|There are two sets of signals that move in
opposite directions as I tune, ie. there is no image rejection.
||Check that you are getting audio from both
I & Q channel.
Check sound card settings
Read the section titled Eliminating Images for a more detailed explanation of the causes and cures of images.
|The audio in the SDR app drops out
|Read the excellent paper Vista
Tuning for LP-PAN.pdf written by
Dave, W8FGU. It is useful for all Windows versions.
Increase the latency setting in NaP3's audio setup.
|The sidebands are reversed when I listen
to NaP3 output.
||Check your audio cabling. If you are using
color coded audio cables, the white cable should connect to the Left
input of LP-PAN, and red to the Right (Q) input. You can also reverse
sidebands by clicking the "Swap IQ" checkbox on the Input tab in NaP3.
|There is a “hump” or “hole” in the noise
floor near the center of the display.
||Check your cabling for a loose connection
Check the Bal/Unbal switch on the back of LP-PAN, or the BAL-UNBAL jumpers on LP-PAN 2.
Check for power supply ground differences between radio and LP-PAN.
Could be the result of using non recommended sound card
Could be an anomaly of the rig's IF output (poor filter matching in an older Kenwood, for instance).
|The signal's frequency in the display does
not match the rig frequency.
||Perform the IF Frequency offset
adjustments for your rig as shown on the NaP3 Help page. Make sure your
settings match the pictures, except for the Global
Offset which will vary slightly from rig to rig. Adjust Global Offset
the display with your rig in AM mode if necessary.
Also, make sure I and Q are not swapped.
|I get a big red X in the pan display
||This is generally caused by a bug in NaP3
v4.0. In Setup, in the Display tab under "Band Plan", make sure that
the IARU region is set to Region 1 (even if you're not in region 1).
/ changing / fixing NaP3 problems...
Many of the problems associated with the software have to do with wrong or corrupt entries in the database files for NaP3. To understand how to address problems and correct them, it helps to know what files are created when the programs are installed, and where they are stored.
The main installation
folder can be found
in this folder…
The files in the folder include the program (NaP3.exe), a help file and supporting files. Because of the UAC user account rules in Vista / Windows 7, NaP3 does not save the database files for preferences and settings in this folder, but rather in one of the following AppData (or Application Data) folders…
The folder contains a preferences file, called NaP3.xml. This file contains all the settings from the SETUP section of the program, and other parameters such as WBIR seed values, band stack data, etc. Another file called wisdom is also stored here. This file is created when you first start NaP3 and it calculates the forward and reverse FFTs.
The files can be found in the following paths based on your OS, substituting your user name for the name Larry ...
C:\Documents and Settings\Larry\Application Data\NaP3\NaP3.xml
Vista & Win7
With Vista and Windows 7 you can also enter the following shorthand in Windows Explorer, %username%\AppData\Roaming\NaP3 to quickly navigate to the file. This shortcut should be entered exactly as typed here (do not change the word "username" to your user name).
It is probably smart to create a shortcut to the appropriate folder for your OS, so that you can easily navigate to these folders in the event that your settings become damaged. It also makes sense to save a backup of the two database files to another folder somewhere.
If it becomes necessary to start over, here is the procedure I would use to uninstall / reinstall NaP3…
Uninstall all versions of NaP3 on your computer using “Add / Remove Programs” or “Programs and Features” in the Control Panels folder. The one to use depends on your OS. I would also delete the NaP3 installation folders in Program Files after uninstalling, and remove the NaP3 folder in the AppData folder. This removes the database files where NaP3 stores your user preferences and settings. The exact path will depend on your OS and whether you chose "Just Me" or "Everyone" when installing NaP3. If you chose "Everyone", and log in with more than one username, you will have to delete the AppData database files for each user, or for "All Users". We recommend using the "Just Me" option.
You will need to substitute your username for "Larry" in the examples. Once you have removed all the NaP3 remnants, NaP3 should install as though it was on a virgin computer. You will need to re-enter all your settings unless you have previously saved a backup of the files.
Support is also available directly from TelePost through at firstname.lastname@example.org anytime or telephone at 734-455-3716 during normal business hours. There is also a Yahoo User Group at http://groups.yahoo.com/group/LP-PAN/ with a large number of helpful users.