2550Re: [wsjtgroup] WSJT 5.8.6 Tone Level Settings, TX/RX Delay
- Oct 1, 2005Joe --
Here are a few quick answers to your questions.
Joseph A. Counsil wrote:
> Greetings,I decided that those tone adjustment boxes were a bad idea.
> I have been using WSJT 5.8.6 the last couple of weeks, having upgraded
> from 4.9. Joe has done an excellent job of adding new features and
> integrating the package.
> There are two things I do not find in the new version which I needed
> in the old...
> 1) Tone Level Settings - The old version had an option in the settings
> to tweak the audio level on each of the four tones. I found with my
> system that the tones were not all generating equal output from the
> radio, so was able to improve that by using these settings. With the
> new version, I don't find that capability anywhere (not even hidden in
> the configuration file in the WSJT program directory). Am I missing
Software solutions to hardware problems are generally "kludges". In
this particular case, if different tones coming out of the soundcard
have different amplitudes there will be sharp discontinuities in the
audio waveform. This will produce out-of-band distortion products.
One of the advantages of the FSK441 waveform, as designed, is that it
has constant amplitude and continuous phase. This means that it
produces less RFI/TVI than SSB or CW (because no amplitude modulation is
present), and it means that you can use non-linear power amplifiers
without introducing signal distortion.
With radios that are just "a bit off", it generally works well to just
turn up the Tx audio gain (or soundcard output) a bit, letting the
stronger tone(s) saturate if need be. Because only one tone is present
at any instant, this will *not* distort your FSK441 signal, or produce
out-of-band splatter, the way it does with PSK31.
> 2) TX/RX Delay - The old version had an option to implement an RXI decided to simplify things and make these values fixed. The TxDelay
> delay time before the program would begin acquiring data when
> switching from TX to RX; and a TX delay time when switching from RX to
> TX. Again, I find no such option in any settings nor in the
> configuration file. Am I missing something?
> I need both of these options to optimally set up my system. My tone
> levels are several dB unequal, and I have TX/RX transients in my data
is big enough that WSJT will not hot-switch your relays. Is there
another reason that you need user control here? Are your switching
transients producing garbage decodes, or something?
-- 73, Joe, K1JT
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