lime mini spurious signal

The place to discuss the use of the LimeSDR Mini for amateur TV applications
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Posts: 6
Joined: Wed Apr 22, 2020 1:01 pm

lime mini spurious signal

Post by g4bgq » Sun May 03, 2020 10:25 am

I purchased a lime mini only to find it generates a spurious signal near to whatever frequency it's tuned to.
See the attached image, the lime is tuned to a random frequency with no input but there is a signal showing anyway.
Is this a function of the lime or is it defective.
I'm not having much luck with these devices after getting a faulty Pluto as well.
Capture.PNG (81.54 KiB) Viewed 222 times

Posts: 655
Joined: Tue Feb 16, 2010 12:51 pm

Re: lime mini spurious signal

Post by G4GUO » Sun May 03, 2020 11:56 am

You have just discovered the major flaw with ALL zero IF (Direct conversion) receivers.
Usually it can be mostly calibrated out but it is always there to some extent.

There is nothing wrong with it

- Charles

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