On 21/11/2015 14:34, Dave Plowman (News) wrote:
In article ,
Brian-Gaff wrote:
With the proliferisation of mobile devices running on the mobile phone
network its getting increasingly a annoying to listen to things on a
good old fashioned or even new fangled radio, without the noise
occurring at some point. Even from next door one can get it getting into
the audio chain. Anyone know if there is an easy way to stop it. In the
old days a few capacitors got rid of Radio China or Vatican City, but
due to the high frequencies of the phones and the spiky nature of the
handshaking noise, this seems not to work much. What is the mechanism.
they cannot be tuned to the r frequencies, so is it just straight diode
type detection due to the huge signal level?

Low level circuits like turntables, microphone inputs etc, seem to be
the worst, but I've also proved my Denon is picking it up from its
speaker cables.

You seem to be very unlucky or live in an odd area or have odd equipment
if you're picking up interference on a pickup or mic?

My laptop reports some 20 Wi-Fi signals at usable level round here, but no
problems on the Hi-Fi here. Or with mobile phones which I'd guess are as
common as the above.

Obviously, roaming the radio waves for distant and obscure stuff might be
a different matter.


FWIW, my iPhone's 'polling' (not sure how, what or why) can be heard on
my hifi, FM radios, and work's PA systems in lecture halls. It's a sort
of chirping, and lasts about 10s.

--
Cheers, Rob