Troubleshooting
Below are some problems that have been reported, and some suggested solutions. If you still have a problem, I am
always available by email at larry@telepostinc.com and the LP-PAN Yahoo Group is available at http://groups.yahoo.com/group/LP-
PAN/
Display shows noise but no signals
1) Check audio and RF cabling.
2) Make sure the correct sound card is selected in PowerSDR
There are two sets of signals that move in opposite directions as I tune, ie.
there is no image rejection.
1) Check that you are getting equal audio from both I and Q channels.
2) Adjust image rejection per the procedure in the Setup/Calibration
section.
3) Check cabling.
The audio in PowerSDR drops out frequently
1) Increase audio buffer size to the maximum value in Setup>Audio tab.
2) Read the excellent paper “Vista Tuneups for LP-PAN”, written by Dave,
W8FGU, and available on the LP-PAN User Group Files section at
http://groups.yahoo.com/group/LP-PAN/files/. It is useful for XP as well.
When I start PowerSDR, the audio “motorboats”.
Go to Setup>Audio tab, and check the “Expert” box. Click OK to the
warning, then check the “Manual” box and set latency of 2 ms or more as
needed to stop motorboating.
There is a “hump” or “hole” in the noise floor near the center of the display.
1) Check your cabling for loose connection which could cause hum.
2) Play with the settings of the Bal/Unbal switch and “ground lift”
jumpers.
3) Make sure you are using a recommended sound card.
The center frequency in the display does not match the rig frequency.
Perform the “offset” adjustments in PowerSDR per the procedure in the
Setup/Calibration section. Make sure your settings match the picture
exactly, except for the Global Offset which will vary from rig to rig.
I don’t see my sound card listed under the available sound cards in the
Audio setup tab.
1) Check that your sound card is properly installed. You can do this in
Device Manager.
2) It is wise not to make your LP-PAN sound card the Windows default.
This can be checked under “Sounds and Audio Devices” in the
Windows Control Panel.
3) Update your sound card’s driver to the latest available from the
manufacturer’s website.
4) If your sound card is USB, it is usually recommended to have a USB
2.0 port. Use of a USB router for a sound card is not recommended.
5) Try all available drivers in the Drivers selection in
PowerSDR>Setup>Audio. ASIO is the preferred driver if available,
followed by WDM and then MME or other. ASIO is generally required
for 192 kHz sampling.
E-MU Sound card will only work at 48 kHz
Make sure your USB ports are 2.0. The E-MU defaults to 48 kHz with USB
1.1 ports
E-MU was working at 192 kHz, but after upgrading XP to SP3, it only
works at 48 kHz now.
This appears to be a MS bug with SP3. Uninstall both E-MU driver and
PowerSDR, reboot, reinstall driver and PowerSDR.
I can’t get the rig to go to 6m when connected to PowerSDR.
Go to Setup>General>Softrock IF Stage and set Frequency Limits Max to
54.0000000
Frequency doesn’t display properly in PowerSDR when using non-English
Windows settings.
Use Regional seettings to choose U.S. English settings, or to set number
format so that comma is decimal point and period is thousands divider.
Your are getting erratic frequency and mode jumps
Try s slower polling rate.
If you are using a USB to serial adapter, it is recommended that it use an
FTDI chipset. The KUSB adapter sold by Elecraft does not, and will likely
cause problems.
Support is available from TelePost at larry@telepostinc.com anytime, or 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.
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