KA7U

Thanks for posting this information. Currently I have one notch filter set for 1380 KHz. It was the only local station causing problems. The filter I made is bit wide a attenuates a wider bandwidth than I would like. Still it is quite useful. The 4-1 transformer idea is a great bit of information.

http://sdr.hu is back up and running as before. I am pleased that it is. Without this web site it is difficult to find the hosted receivers around the world. Thanks to Andres for getting it back online. 

I used a series LC circuit to attenuate a nearby MW station on 1380 KHz. The Q of the filter was a bit broad and took down some neighboring stations, but it did solve the problem of spurious signals up and down the band. This calculator makes it easy to find values:
http://www.1728.org/resfreq.htm

Never know when Radio Purga will come on, or which frequency. It always seems to play the same recorded music.
Ron
KA7U

https://www.dropbox.com/s/bi6mao9n0e2d9un/vokoscreen-2020-11-05_20-09-15.mkv?dl=0