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AM images on LF and MF range

Posted: Sun Jan 24, 2016 11:04 am
by Sasan
Hi
I knew about FM images on UHF (380-440)
Today I was playing with SDRPlay and I heard some commercial stations on 18KHZ, 155KHZ, 276KHZ, etc
I knew that these can't be real and found out that these are in fact, images.
Has anyone else noticed this behaviour before? Can it be overcome?

Thanks

Re: AM images on LF and MF range

Posted: Mon Jan 25, 2016 11:26 pm
by DaveB
A good quality low pass filter with a suitable cut-off is the only way to get rid of these 'images'. It might comfort you to know that the much more expensive SDRs requires filters to remove break through from strong stations.

Re: AM images on LF and MF range

Posted: Thu Apr 28, 2016 3:56 am
by jackb
I had the same problem with the RSP and a fairly high end receiver that I have. A Google search brought me to this forum topic. I found a very complete discussion (including how to set up the filter) at this: http://www.dxing.com/tnotes/tnote06.pdf