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micro bitx: strong signals from broadcasting stations

vu3jyt
 

Hi,
I have successfully completed the microbitx construction. when I calibrate I could hear the strong signals from the local broadcasting station. I could not avoid it,though I hear the ham nets in 7.050 and 7.12345etc. I tried several times to calibrate it but in vain. any solution for this.  73 VU3JYT

iz oos
 

What does local mean? A nearby station on medium wave, a station just above the 40 meters band or an FM broadcast?


Il 04/giu/2018 11:52, "vu3jyt" <vu3jyt@...> ha scritto:
Hi,
I have successfully completed the microbitx construction. when I calibrate I could hear the strong signals from the local broadcasting station. I could not avoid it,though I hear the ham nets in 7.050 and 7.12345etc. I tried several times to calibrate it but in vain. any solution for this.  73 VU3JYT


vu3jyt
 

The signals from MW broadcast.

iz oos
 

That can be removed with a high pass filter especially if you don't mind for the 160meters band. It can be done with three small toroids and high voltage ceramic capacitors. Just put externally. You might also try a notch filter that eliminates the offending frequency. Of course all this assumes that the MW broadcast does not emit spurs on the HF, in this case you could not do much


Il 05/giu/2018 07:26, "vu3jyt" <vu3jyt@...> ha scritto:
The signals from MW broadcast.