[minima] Re: si570 Arduino Interface
- From: "Steve VK2SJA" <vk2sja@xxxxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Fri, 24 Jan 2014 10:56:43 +1100
Hi Mark,
I suspect that this might be a case of "The Devil hiding in the digital
details".
Your running the SA at 150Mhz span with 100kHz resolution bandwidth. Can
you try drop the span to say 50kHz centred on the frequency of interest
and make sure your resolution bandwidth is set as low as it can go? 100Hz
I think for the Rigol DSA-815? Essentially setup the analyzer as if you
were going to sweep a crystal filter. Then take another snapshot of both
Si570 and AD9851 outputs. Might be worth while trying a couple different
output frequencies as well.
Great blog BTW. Keep posting.
73, Steve
> Hi Gang
>
> I have my si570 working with the Minima code on my Mega2560 board - I've
> grabbed some images on the 'scope and SA of the output at 34.something
> MHz. For a comparison I have also done the same for a AD9851 based DDS I
> have on my bench at the same frequency.
>
> I would be interested to learn from those more wise than me what the
> differences are, please remember that the si570 is straight to the
> instruments whereas the DDS has passed through a 70MHz low pass filter
> on board the eBay sourced module.
>
> http://g0mgx.blogspot.co.uk/2014/01/minima-arduino-si570-interfacing.html
>
> Mark
> G0MGX
>
>
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