RF on a buttset

[Dr_Doggy]

once in a while when i hook my phone butt-set up to things i get what sounds like am radio.
all in all i figured, ya so wat, a twisted pair of wires could easily be antenna, and due to some magic i could see the but-set being/having a receiver somehow,

however today i found some wires that ran to a old phone jack, i plugged in butt-set at the dmark and as usual got my am radio, however along with the radio came some sound that were like a static pulse building and discharging, like a crackling,, which i see sometimes as well, today though i cut out the old wall plate, but along with loosing the static charges i lost am radio too.

not complaining, but what is happening here and why did it happen? again i can see how phone wire can be antenna, but how does the plate tie in, could it be a partial short in the plate to cause a RLC effect??

should i consider am radio on my butt set to indicate short circuit problems?

or maybe check the plate closer to see if CIA was there!!

 

[MikeMl]

Corroded, loose contact between dissimilar oxidized metals can create a rectifying junction; witness the blue-razor crystal radios built in prison.

You must be close to an (likely AM band) broadcast station.

 

[Dr_Doggy]

hey ya of course that makes total sense, also that would mean the pulsing was fast decay aswell.

however i dont think i detected continuity, could have been polarity issw thou, would resistance be low enough on my ohmmeter to detect that or similar?

wait! should i use the method of radio on butt set to detect these shorts, is it designed that way??

what about if i put a toner on it, thats ac right(i will check), maybe i could do a circuit, to filter the tone, and then listen for anomalies?

....or just trust the radio?