am station coming through speakers

[balddor]

Hi everybody. This is bugging me and so far I have come up with nothing on this problem. I have my tv connected to my Kenwood KR 7050 receiver and when I switch to FM or Aux ( for the tv ) I hear a faint sound of a AM radio station. I have switched cables, readjusted my antenna and hooked the TV to a tape monitor loop with no luck, still hearing the AM station.

Now when I disconnect the cables from the Kenwood to the TV, NO am radio comming from the speakers. Everything sounds fine. I have all my equipment, DVD player, VCR, TV and the Kenwood connected to a Power Surge Protector. This also happened with My Pioneer SX-737. So what could be causing this annoying AM station sound ?

Balddor

 

[Rickster71]

Is the sound coming from the stereo speakers or the TV speakers?

 

[sholling]

Many years ago I had a problem with CB radio coming though the speakers. It turned out that the phono-cable was acting as an AM antenna which the receiver dutifully amplified into conversations coming through my speakers.

The two things that I'd look at is do you have amplified speakers? If so I'd look at their cables. If not I'd try a shielded cable between the TV and the receiver. I just wish I could get AM out here in the sticks. I have to pull shows in over the internet.

 

[TLS Guy]

Hi everybody. This is bugging me and so far I have come up with nothing on this problem. I have my tv connected to my Kenwood KR 7050 receiver and when I switch to FM or Aux ( for the tv ) I hear a faint sound of a AM radio station. I have switched cables, readjusted my antenna and hooked the TV to a tape monitor loop with no luck, still hearing the AM station.

Now when I disconnect the cables from the Kenwood to the TV, NO am radio comming from the speakers. Everything sounds fine. I have all my equipment, DVD player, VCR, TV and the Kenwood connected to a Power Surge Protector. This also happened with My Pioneer SX-737. So what could be causing this annoying AM station sound ?

Balddor

This is not an uncommon problem.

I suspect the cable from receiver to TV is quite long. This cable is acting as an antenna to the radio station, and being detected and rectified by the first IC voltage amplifier chip. All solid state junctions have the potential to act like the detecting diode of an olf fashioned crystal set.

You have a few options.

Can you in any way shorten the distance between TV and receiver?

You could solder small RF chokes inside a male stereo TRS jack, and then plug that into a female TRS in line jack and connect each end of the TRS plug and socket to RCA jacks. Place the TRS jack with the RF chokes as close to the receiver as possible.

Use an unbalanced to balanced transformer at the TV, and change the cable to a balanced 600 ohm one, and then use a balanced to unbalanced transformer at the receiver end.

Options two or three would guarantee the best success.

Let us know which you would like to do and I will try and help you source the parts.

 

[jnl67]

Try taking the suspected cable and wind a few wraps through a ferrite bead, or you can try the snap on chokes available at radio shack.

Personally, i prefer the ferrite beads to eliminate RFI

 

[TLS Guy]

Try taking the suspected cable and wind a few wraps through a ferrite bead, or you can try the snap on chokes available at radio shack.

Personally, i prefer the ferrite beads to eliminate RFI

Putting a choke this in series with the central conductor near his receiver is one of the most certain solutions for his problem.

 

[Duff man]

Many years ago I had a problem with CB radio coming though the speakers. It turned out that the phono-cable was acting as an AM antenna which the receiver dutifully amplified into conversations coming through my speakers.

The keyboard player in my band used to have an amp that would pick up CB radio. One day at rehearsal we were betweens songs and we heard the police radio. The keyboard player said, "Hey, that's my brother!!"...his brother was a cop.