[Lf] [Fwd: LF: Re: Ideas for a Slow CW-Viewer]

[Andre' Kesteloot]

DL4YHF at aol.com wrote:

> Hello Alberto and Group,
>
> I have some ideas for a 'Slow-CW-Viewer' (some of them have been implemented
> in Spectrum Lab, others in Spectran, others not at all...)
> How about this :
>
> - adjustable 'color brightness' and 'contrast' with scrollbars for
> post-processing
> - a 'time scroller' for the waterfall, optionally 'time labels' every (N)
> seconds
> - a frequency and time grid for the waterfall
> - a simple 'ASCII-export' feature similar to the ECLIPSE software
> - a feature to ADD or SUBTRACT the audio frequency from the receiver's
>   'zero beat' frequency so we could have a waterfall with 'absolute' frequency
>   scale (for example, RX VFO set to 137.2kHz, audio frequency 507 Hz,
>   display for the waterfall's marker = 137.707 kHz).
> The RX VFO frequency could be entered in an edit control or (if someone got
> enough time to implement it) could be read from the RX via serial interface.
>
> An other point to think about is introducing a 'file format' to save spectral
> data. Such a file could contain FFT bins along with additional information,
> like :
>   - date+time of the reception,
>   - bandwith and resolution of the FFT bins,
>   - exact VFO frequency and LSB/USB information from time of reception
>   - a few lines of plain text for comments, antenna description, location etc.
> The file format (and/or the source code) should be published for all authors
> of FFT-DSP software. These files could be spread via the reflector and be
> loaded into the new 'viewer' for displaying, scrolling, zooming and other
> ways of post-processing). Though handling such a file wouldn't be as easy as
> sharing graphic 'waterfall' files, it offers flexibility for future analysis
> (beacon observation, signal/noise analysis, extraction of 'propagation data'
> etc).  Just an idea -- hw ?
>
> By the way: The complete sourcecode of SpectrumLab is available at
> www.qsl.net/dl4yhf, if you want to take a look at them (written in C++).
>
> 73's and all the best for 2001
>     from Wolf, DL4YHF.