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Weird behaviour simply changing the SR

Posted: Thu Jul 12, 2018 2:44 pm
by Patrick73
Hi !

I noticed something 'strange' by simply increasing the SR, from 2 to 6, in ZIF mode, dec set to 1.
See the attached captures, all centred on the same frequency.

What happens ?

Re: Weird behaviour simply changing the SR

Posted: Thu Jul 12, 2018 2:47 pm
by Patrick73
Part 2 :

Re: Weird behaviour simply changing the SR

Posted: Thu Jul 12, 2018 2:51 pm
by sdrplay
The IF bandwidth can be either 200, 300, 600, 1536, 5000, 6000, 7000 or 8000 kHz

So for sample rates of 2, 3 and 4 MHz, the 1536 kHz IF bandwidth is used, so you will see attenuation of the signal outside of the IF bandwidth. At 5 MHz, the 5 MHz IF bandwidth is used, so that's why it looks "normal" again.

Best regards,

SDRplay Support

Re: Weird behaviour simply changing the SR

Posted: Thu Jul 12, 2018 3:11 pm
by Patrick73
Thanks for the explanation.

Best regards.