FLDIGI/SmartSDR Guide for .XML Settings (Filter and Mode)?

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I am using my Flex6500 with the latest versions of SmartSDR and FLDIGI. I have everything set for DAX and FLDIGI as per the SmartSDR manual and have installed the SmartSDR.xml file for FLDIGI.  I am trying to use BPSK31.  I am at the right frequency (e.g., 14070 MHz) and see the signals in the waterfall, but what shows up as text in the Receive and Notification windows is garbage text.  I suspect that the problem may lie in how I have the modes (i.e., DIGU, DIGL, USB, etc) and the filters (i.e., Filter1 through Filter 8) selected in the drop-down boxes below the frequency display in FLDIGI.  These parameters are from the .xml file, but I cannot find anything about them.  Is there a guide or some documentation on how to use them?  Any other suggestions for the kind of displays I am seeing?  I have tried to set the Tx/Rx text to various fonts (ASCII, UTF, etc.) but it does not make any difference.

Thanks in advance.
73,
WB6RMY
Bill
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Bill Robinson, WB6RMY

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Posted 4 years ago

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Tim - W4TME, Customer Experience Manager

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Bill - Not sure why your audio is garbled.  I'd need to see your set up screens to have an idea.

Regarding the filters, in SmartSDR each mode has a matrix of preset filters.  There are eight of them.  In Fldigi, if you select Filter-1, it will select the 1st (lowest bandwidth) preset filter for the mode Slice A is configured for.  Select Filter-8 and the get the last or highest bandwidth preset filter.  Filter-2 through Filter-7 steps up through the preset filter banks.
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Bill Robinson, WB6RMY

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Hi Tim,

Thanks.  Slice A is simply set to DAX, and uses Ch. 1 as per the example in the SmartSDR manual.  So, I'm confused as to the "each mode has a matrix of preset filters" comment. To what other modes are you referring?   I thought that the modes were selected at the FLDIGI side (PSK, RTTY, etc) and not at the SmartSDR side.  Also, what are the "modes" (DIGU, USB, DIGL, etc.) in the drop-down box below the frequency display on FLDIGI for?

Two other questions: (a) what do you recommend for receiving PSK31 relative to the Filter and the DIGU/USB settings in the drop-down boxes on FLDIGI; and (b) in the FLDIGI Configuration settings (see p. 78 of the SmartSDR manual), should the RTS/CTS flow control box be checked? It's not discussed and I wonder whether that is part of the garbage text problem.

Bil
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Tim - W4TME, Customer Experience Manager

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"So, I'm confused as to the "each mode has a matrix of preset filters" comment. To what other modes are you referring?"

Each slice has multiple demodulation modes you can choose; DIGL, DIGU, USB, LSB, CW, AM and SAM.  Each mode group (narrow (CW) digital (DIGL and DIGU), SSB (USB and LSB) and wide (AM and SAM)) has its own set of preset filters of differing widths.

The "mode" you select in Fldigi is technically referred to as a modem, but the radio is still operating in a specialized configuration of USB (DIGU) or LSB (DIGL).  The filters in the radio are dependent on the Slice demodulation mode, not the Fldigi modem that is selected.  Does this make sense?

In general, I use the 3.0k filter for receiving PSK so I can see lots of the signals in the Fldigi waterfall.  I use the narrower Slice filters (100kHz) if the signal is weak or there are strong signals in the receive passband that is pumping the AGC.

You should not change anything in the RigCAT setup except for the com port number and possibly the baud rate if it is not 9600.  You do not need to change any of the other parameters.  That is what the SmartSDR.XML files does for you; it sets all of the parameter in an optimal way automatically.

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Bill Robinson, WB6RMY

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Hi Tim,

I think I know what I'm doing wrong.  I was confused by tabs on the slice flag. I thought that the USB settings were for voice and that selecting DAX automatically put the slice into a digital mode. I thus have been ignoring the digital modes on the USB tab and thus haven't been setting the USB tab to the right demodulation mode.  I'll try it tonight and I bet that the problem will go away.  Thanks for the help!

Bill