Constant Line On Waterfall In Every Frequency

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marjinal1st
Posts: 2
Joined: Thu May 18, 2017 11:38 am

Constant Line On Waterfall In Every Frequency

Postby marjinal1st » Thu May 18, 2017 11:45 am

Hello there.

I'm using my SDRPlay RSP1 on Windows 10. Must say that I'm a newbie.

Everytime I use SDRUno with my RSP1, I'm seeing a constant line on the waterfall's center, in every single frequency. Can't really figure out what the heck is that. Screenshot:

Image

What is (or could) it be? Any ideas?
Last edited by marjinal1st on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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Tech_Support
Posts: 196
Joined: Mon Jun 01, 2015 7:00 pm

Re: Constant Line On Waterfall In Every Frequency

Postby Tech_Support » Thu May 18, 2017 12:27 pm

Hello,
The RSP uses a zero IF architecture and the spur you are seeing results from residual DC offset in the I/Q signal paths. This is sometimes referred to as a 'centre spike'. It is rarely a problem, but it is important to ensure that your VFO is offset from this spike as the DC offset correction algorithms will distort AM signals. If this small spur bothers you, you can select Low IF mode and the spur will not be present. However in Low IF mode, you will be limited to a maximum of 1.5 MHz.

Sincerely

SDRplay Tech_Support

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marjinal1st
Posts: 2
Joined: Thu May 18, 2017 11:38 am

Re: Constant Line On Waterfall In Every Frequency

Postby marjinal1st » Mon May 22, 2017 2:21 pm

Thanks for the explanation.
Last edited by marjinal1st on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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