Inconsistency in par_ssb in 64bit Linrad-05.02

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Scott T

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May 21, 2025, 8:55:51 AMMay 21
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Running 64bit Linrad-05.02 with a working setup on SSB.
If I 'x' out of SSB the current parameters list shows:  "First FFT bandwidth (Hz) [10000]"
If I then go to Change Parameters ('P') the header says:
"SSB:  Rx channels =1  fft1size=32768 (Bw=122.070312 Hz) Radix 2 DIF C"
and the listing of parameters underneath says 
"First FFT bandwidth (Hz) [100]".
If i click on First FFT bandwidth, the change page says "Old value = 100.00"  If I actually change it to 10000 Hz then fft size=512 (Bw=7812.5), and the main waterfall is now incredibly (unusably) fast with little frequency resolution.

The par_ssb file also shows "First FFT bandwidth (Hz) [10000]"

Bug?
Thanks,





Leif Asbrink

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May 21, 2025, 12:22:23 PMMay 21
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Hello Scott,

This is not a bug, it is a consequence of laziness. Originally
the minimum bandwidth was 1 Hz and the parameter was stored as an
integer. When I found that bandwidths below 1Hz woud be needed
for some specific purposes I did not rearrange everything to store
the parameter as a float, I just left it an integer with a
value one hundredth of the actual bandwidth. The text describing the
parameter is used on screen as well as in the file so I can not change
to ".01Hz" instead of "Hz" without difficulties.

73

Leif
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Scott T

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May 21, 2025, 2:23:01 PMMay 21
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LOL well at least now I have the decoder ring. 
thanks!!

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