Hi Guys,
As an active WSJT-mode user, I'll attempt to clarify this set of issues.
For a more complete answer, download the WSJT 10 and WSJT-X pdf documents.
WSJT 10 and WSJT-X are designed for the rig to be set for the full USB
bandwidth of an average radio. Each mode has an agreed upon slice
> "Joe" == Joe Subich, W4TV writes:
Joe> It depends on your "roofing" filter ... If you have an AM (6 KHz) or
Joe> FM (13 KHz) filter, you will see 300 Hz to 4200 Hz with FC=2.20 and
Joe> BW=4.00 (at -3dB). If you only have a 2.8 KHz filter, bandwidth
Joe> will be around 280
Yes, and that was what I wanted to know. I've read in this mailing
list that the DSP limits the audio at 4 kHz. I'm seeing it roll off
at little above 3400. The low end rolls off at around 300, so I'm
getting an audio passband of ~3100 Hz. I wonder if this is normal, or
if there's something else
> "Matt" == Matt Zilmer writes:
Matt> Hi Pf,
Matt> Most tone modes operate at an offset from carrier frequency, so that
Matt> the audio frequencies of interest are more or less cenetered in the
Matt> filter passband. I believe the JTx modes are already in the 1200 to
Mat
Hi Pf,
Most tone modes operate at an offset from carrier frequency, so that
the audio frequencies of interest are more or less cenetered in the
filter passband. I believe the JTx modes are already in the 1200 to
1500 Hz range so no offset is required.
The crystal filter being used only restricts
Hello,
I'm dabbling with wsjtx, and I see that my rx audio has some definite roll
off at <300 Hz and >3500 Hz. Selected filter is the 12 kHz one, and
width is set to 4 kHz. Audio soundcard is the Numark studio-io, but I
also saw this with an el-cheapo adapter.
Also, I see the same roll-off in fld
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