Hi,
yes, as I wrote, I hear strange radio communication from my speakers. And no, not because of the Austrian beer😛
It's distorted and I can't even identify the language, in any case it's not German, but because of the distortion I can't tell what it is, maybe English, but not understandable. And it seems to be a standard text that is repeated again and again.
But the bigger problem is: why am I hearing this? My Marantz SACD player, the Iron Pumpkin and the Scryer are switched on. It's weird and I'm somewhat shocked 😱
Any hint would be much appreciated.
yes, as I wrote, I hear strange radio communication from my speakers. And no, not because of the Austrian beer😛
It's distorted and I can't even identify the language, in any case it's not German, but because of the distortion I can't tell what it is, maybe English, but not understandable. And it seems to be a standard text that is repeated again and again.
But the bigger problem is: why am I hearing this? My Marantz SACD player, the Iron Pumpkin and the Scryer are switched on. It's weird and I'm somewhat shocked 😱
Any hint would be much appreciated.
most of the time it happens when there is a strong signal close by and something in your system is acting like a diode.
That can be result of:
Cold solder joints.
Bad cables or cable between the various pieces.
Corrosion on connectors
Capacitors that have about had it
A close by radio tower with bad or corroded antenna. The same effect but at the other end. It can turn any signal into a wide band noise.
Look around you also for talking signs for home sellers. Highway information systems. Etc
So disconnect everything from everything else except the speakers and see if the amp just alone is still making the noise. If you hear nothing then plug just the input cables in but disconnected from your CD player.
Even a loose connection on a powerful shortwave station thousands of miles away can cause it. You may find replacing the cables with something a little longer or shorter makes it stop.
That can be result of:
Cold solder joints.
Bad cables or cable between the various pieces.
Corrosion on connectors
Capacitors that have about had it
A close by radio tower with bad or corroded antenna. The same effect but at the other end. It can turn any signal into a wide band noise.
Look around you also for talking signs for home sellers. Highway information systems. Etc
So disconnect everything from everything else except the speakers and see if the amp just alone is still making the noise. If you hear nothing then plug just the input cables in but disconnected from your CD player.
Even a loose connection on a powerful shortwave station thousands of miles away can cause it. You may find replacing the cables with something a little longer or shorter makes it stop.
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About 55 years ago I had the same thing happen. I was living near Atlantia Ga. USA and
evenings the phono section of my Advent reciever would pick up Radio Canadia International.
Several other Advent owners also experienced this problem and the solution was to place a
small cap across the phono input I think it was something in the 22 to 470 pf range.
evenings the phono section of my Advent reciever would pick up Radio Canadia International.
Several other Advent owners also experienced this problem and the solution was to place a
small cap across the phono input I think it was something in the 22 to 470 pf range.
first thing is to determine where in chain is pick-up point
try different cables, from source down
different means - different, not necessary better
try different cables, from source down
different means - different, not necessary better
Thanks to all.
As I couldn't change the volume of this signal it was obvious that it's not from one of my sources.
I then separated the preamp from the power amp and the "radio" was still here. And now I could remember that I had this issue about 3 months ago, but only once, not repeatedly, with a completely different setup, only the speaker was the same as far as the internal cabling is concerned. This has a piece about 1m long between xo and fr driver and I think it could work as an antenna. And if there is a strong signal near to my location, it can cause problems.
As I couldn't change the volume of this signal it was obvious that it's not from one of my sources.
I then separated the preamp from the power amp and the "radio" was still here. And now I could remember that I had this issue about 3 months ago, but only once, not repeatedly, with a completely different setup, only the speaker was the same as far as the internal cabling is concerned. This has a piece about 1m long between xo and fr driver and I think it could work as an antenna. And if there is a strong signal near to my location, it can cause problems.
try separate wires, with physically more distance in between them - for positive and negative leads to speakers
It can happen with none screened amplifiers.
In 1980 I built a Maplin 225WRMS amplifier.
One day there was suddenly some talking coming through on it.
It was a police radio channel.
I looked outside and the local police van was there with the officer on the radio.
They used to recommend a few pf capacitor on input to the amplifier to short out VHF.
In 1980 I built a Maplin 225WRMS amplifier.
One day there was suddenly some talking coming through on it.
It was a police radio channel.
I looked outside and the local police van was there with the officer on the radio.
They used to recommend a few pf capacitor on input to the amplifier to short out VHF.
Ferrite beads, and make a loop on the speaker wires.
Or try some other form of magnetic shielding.
If possible, connect the driver housings (metal) to amp Earth with a single wire from a scrap CAT 5 or telephone cable, a thin strand will do.
And see if crossover can also be connected.
RF pickup can be difficult to isolate and deal with.
Or try some other form of magnetic shielding.
If possible, connect the driver housings (metal) to amp Earth with a single wire from a scrap CAT 5 or telephone cable, a thin strand will do.
And see if crossover can also be connected.
RF pickup can be difficult to isolate and deal with.
Thanks for the hints. Luckily it was only the second time, so it's not a big problem, but I will try some measures, f.e. separate the wires.
Use to live next to a church and they broadcasted in AM
Signal was strong.
Working on projects, was a pretty good judgement if my RF
blocking circuits were actually working.
Lot of inside jokes with musicians on this topic.
Electric instruments pick up radio real good.
Often received some interesting shows on practice
night. Movie, Spinal Tap has a scene, where show is ruined.
Because his guitar wont stop picking up airport radio.
Signal was strong.
Working on projects, was a pretty good judgement if my RF
blocking circuits were actually working.
Lot of inside jokes with musicians on this topic.
Electric instruments pick up radio real good.
Often received some interesting shows on practice
night. Movie, Spinal Tap has a scene, where show is ruined.
Because his guitar wont stop picking up airport radio.
