[hpsdr] Wide bandscope

[Bob Cowdery]

Just realised I got bounced from the group again so not sure if this got 
through or if any replies got junked.


On 4/23/2018 7:48 AM, Bob Cowdery wrote:
> Hi,
>
> I have some questions regarding the wide bandscope. Yes, I'm still 
> playing with Atlas based protocol 1 system after all these years!
>
> Metis V3, Mercury V3.4, Penelope V1.8
>
> 1. Could someone explain what the wide bandscope should show. The 
> noise floor seems to be constant across the frequency range and does 
> not follow the actual noise floor. Also the display varies with the 
> receiver frequency giving the impression that the data is going 
> through a bandpass filter. With 3 receivers all 3 have an effect.
>
> 2. I'm not sure if I should be taking 4096 or 16384 samples to process 
> as the documents are ambiguous.
>
> 3. I've got the implementation wrong somewhere, never been sure about 
> how to process this stuff. I followed what KISS does but have not 
> ended up with the same display. The code for that part is in C so if 
> anyone would like to help spot the problem I will post it.
>
> Thanks for any help
>
> Bob - G3UKB
>