I am puzzled by poor decoding of PSK31 signals with FLdigi and DXLabs Winwarbler on my Flex 6500. Generally, any signal less than -85 dBm is mostly gibberish with either digital application. Only very strong signals produce usable copy.
I’ve gone over my settings repeatedly, but have yet to identify any problems. Here are the system and software configuration parameters:
Dell 9000 i7 920, 8GB, Win 7/64 bit with all updates
SmartSDR.xml version dated 8-MAR-2014
CPU utilization 8-12% average
Capture: DAX Audio RX 1 (DAX RX Audio)
Playback: DAX Audio TX1 (DAX TX Audio)
Converter: Medium Sync Interpolator (tried others)
SmartSDR settings for digital mode:
DIGU 3.0 khz (tried many filters, including 100 hz and lower)
DAX button enabled
DAX Channel: 1 (set to peak slightly below 0 db, although I’ve tried lower levels and have tried other DAX channels)
Windows 7 sound settings:
DAX RESERVED AUDIO RX1 (Ready) 2 Channel, 16 bit, 48000 Hz (DVD Quality)
DAX AUDIO TX1 (Ready), 2 Channel, 16 bit, 48000 Hz (DVD Quality)
I made hundreds of PSK31 contacts with a Flex 5000A using VAC and FLdigi and could often get viable copy of signals not much above the noise floor.
Any advice or suggestions would be greatly appreciated.