[hpsdr] Higher sampling speeds

[Phil Harman]

Hi Alberto,

Yes, there a lots of plans for many new and exciting Mercury features - 
plenty of plans but few volunteers to do the work!

If you look at

http://hpsdr.org/wiki/index.php?title=CYCLOPS

you will see Mercury displaying 50MHz of spectrum. Until the new 
PowerSDR architecture is released I can't see anyone wanting to modify 
the current code for higher sampling rates - or more accurately wider 
bandscope displays.

A port to SDRMAX should be possible - volunteers?  :)

73's Phil....



Quoting Alberto I2PHD <i2phd at weaksignals.com>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Are there any plans to increase the final sampling rate(s) in Mercury 
> after the DDC ?
> The recent additions of 96 abd 48 kHz are certainly useful, but as 
> much useful and
> possibly more could be the addition of higher speeds, like 250, 500, 
> 1000 and 2000 kHz.
>
> Tests done with Perseus and by Phil with his QS1r have shown that a 
> sampling rate of
> 2 Mhz is manageable without much problems. I have a 1.5 GHz laptop, 
> with a single core
> Mobile Pentium that can handle Perseus at 1 MHz sampling rate without 
> audio disruptions,
> and a decent waterfall speed. This demonstrates that you don't need 
> stratospheric
> computing power to cope with higher sampling speeds.
>
> And the objection that those sampling rates are not multiple of the 
> sound card rates,
> has no much relevance. A fractional ratio resampler can be coded 
> rather easily, with
> spurs down to -100dB.
>
> Having a larger chunk of the band visible in the waterfall at once 
> could be useful, e.g.,
> when using Mercury together with a down converter for the 144 MHz band.
> Another use of a wider chunk of band could be the recording into an 
> I/Q WAV file of the
> entire segment of the Medium Waves, to be later on replayed for 
> identification of DX
> stations. This is what is most sought of by the MWLs and SWLs.
> And I am sure there could be much more applications for a 2 or even 4 
> MHz bandwidth.
>
> 73  Alberto  I2PHD
>
>
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