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Audio spontaneously develops volume flutter at about 10 Hz

Bradscopegems

Mar 29, 2022
3
Joined
Mar 29, 2022
Messages
3
I listen to Radio 4 a lot. My radio indicates that I use 12B 225.648MHz. Sometimes, I get an oscillation of volume at a constant frequency which I estimate to be around 10 Hz, making speech almost incomprehensible though quite audible. This can be cured by turning the radio off, after which I get a period of silence, a short burst of noise and the signal comes back OK. I have tired to cure this by using different portable radio sets and different radio headphone units, but nothing has worked. I am wondering if I am getting periodic pickup of two signals with a very slight frequency difference, so I am hearing audio frequency beats. Does anyone know what is happening?
Bradscopegems
 

Bradscopegems

Mar 29, 2022
3
Joined
Mar 29, 2022
Messages
3
Would such a dodgy capacitor be likely to occur in two different radio sets or two different radio/headphone units? The
fact that I had the same problem with two sets of totally different equipment suggested to me that it was something about my environment rather than inside the equipment...
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
Are you using a power pack/charger?

I've had BlueTooth audio issues from leaving the device on permanent charge.
 

ramussons

Jun 10, 2014
462
Joined
Jun 10, 2014
Messages
462
Radio wave reflections can cause motorboating.
If indoors and not using an external antenna, a ceiling fan can cause this havoc. I have noticed this in portable FM receivers.
An external antenna pickup can also be interfered with by moving bulk of metal - trains, ships, aeroplanes ( :eek:), ...
 
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