MW interference problem

[inductor]

Hi
I like to listen to a station 1000 Miles away on 1190KHz at night. I use a tuneable multi turn magnetic loop antenna that is passively coupled to the ferrite rod in the radio to pull in the station, it works well.

But there is a station at 1200KHz on nearly the same vector that bleeds over the station I want.

How can I make a low pass RF filter that would choke off anything above 1190KHz and employ it with my present setup??

 

[keith1200rs]

A tunable notch filter would be more effective than a low pass filter.

Keith

 

[inductor]

Ok
How can I make a tunable notch filter that would stifle 1200KHz and allow 1190KHz and employ it with my present setup??

 

[RF_Jim]

Hi
I like to listen to a station 1000 Miles away on 1190KHz at night. I use a tuneable multi turn magnetic loop antenna that is passively coupled to the ferrite rod in the radio to pull in the station, it works well.

But there is a station at 1200KHz on nearly the same vector that bleeds over the station I want.

How can I make a low pass RF filter that would choke off anything above 1190KHz and employ it with my present setup??

View attachment 72641

inductor,

Your best bet is probably to buy a communications receiver and then use the LSB (Lower Side Band) receive mode.

Also, if you go that route, you could probably be able to vary the IF bandwidth AM mode, or maybe at least 'shift' the receive passband down 3 or 4 kHz thereby attenuating the lower sideband and carrier from the 1200 station using the radio's native built-in IF (Intermediate Frequency) filter.

I have done each of the above with several HF receivers I presently own (Kenwood, TS-140S, Icom IC-756Pro2 etc.) to avoid a next-channel-up AM radio station.

Jim