Constant Line On Waterfall In Every Frequency
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- Posts: 2
- Joined: Thu May 18, 2017 11:38 am
Constant Line On Waterfall In Every Frequency
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:
What is (or could) it be? Any ideas?
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:
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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Reason: No reason
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- Posts: 499
- Joined: Mon Jun 01, 2015 7:00 pm
Re: Constant Line On Waterfall In Every Frequency
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
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
Reason: No reason
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- Posts: 2
- Joined: Thu May 18, 2017 11:38 am
Re: Constant Line On Waterfall In Every Frequency
Thanks for the explanation.
Last edited by marjinal1st on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
Reason: No reason
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