Re: Strange Things that Happen!!!

[Jim Davis <Madno@xxxxxxx>]

On Saturday, September 24, 2022 at 8:50:54 PM UTC-4, ABLE1 wrote:
> On 9/24/2022 7:35 PM, Bob La Londe wrote:=20
> > On 9/24/2022 9:49 AM, ABLE1 wrote:=20
> >> Hey All,=20
> >>=20
> >> I don't know if anyone here (other than me) does work=20
> >> on School Sound PA System.  Recently I had to add=20
> >> six(6) Modular Class Room Speakers to the School System.=20
> >>=20
> >> Pulled the speaker cables (22/4 Shielded) from the office=20
> >> system to each of the classrooms.  This all happened before=20
> >> school started 4 weeks ago.  I was just informed that the=20
> >> one room M-105 there was noise of some kind on the Listen.=20
> >>=20
> >> If you don't know. When the Listen Button is pressed you can hear=20
> >> what the teacher is saying and then when you press the Talk=20
> >> Button the teacher can hear what you are saying.  Similar to=20
> >> a basic Intercom System.=20
> >>=20
> >> Well the sound is a Tikity Tikity Tikity in the background.=20
> >> To make a long story shorter.  I think I figured it out today=20
> >> that when I made a splice on the wires I left a 4-5" tail and=20
> >> beanie spliced each wire and then folded the wire inside a=20
> >> metal 4"x4" box with metal cover.  In the same closet there=20
> >> is a Security Panel, Fire Panel, and some IT Network Data=20
> >> Switching.  The Data Switch has a Cooling Fan and it is making=20
> >> a noise of sorts.=20
> >>=20
> >> What I ended up doing was to take some Tin Foil and wrapped up=20
> >> the spliced wires and stuffed it back into the box. I know it is=20
> >> early but the Tikity Tikity Tikity has gone away.=20
> >>=20
> >> At least to MY EARS!!=20
> >>=20
> >> I am thinking that the fan or something was putting out some RF Noise!=
!=20
> >> And the wire tails were picking it up and amplifying it to the office.=
=20
> >> Adding the Tin Foil has blocked the noise and hopefully fixed the issu=
e.=20
> >>=20
> >> I will know more when staff gets in on Monday...................=20
> >>=20
> >> Hope you enjoyed the read!!!=20
> >>=20
> >> Les=20
> >>=20
> >=20
> >=20
> > So inclusion a tin foil may actually stop the voices.
> LOL=20
>=20
> Only if the foil is placed properly in the hearing canal!!



 Hi Les

Well, I found out the if  I  place the foil in the ear canal just right, be=
tween that and my tinfoil hat, I can sometimes get good Country music from =
WWVA Wheeling West Virginia

Anyway, with regard to the "Tikity Tikity" sound:
Are there any alarm systems or keypads around?=20
Did the clicking sound like if might come from a an alarm keypad? Like the =
sound you get with a wire toner probe?=20
.
Also, some of the three separate types of fire alarm system signaling paths=
 can emanate clicking sounds. From initiating device circuits (IDC), signal=
ing line circuits (SLC), and notification appliance circuits (NAC). Dependi=
ng upon the type of panel being used
and if any of your audio connections have exposed pigtails (Even the tinies=
t strand )they can act as an antenna.=20
.
 Also are you grounding one end or both ends of the shield? And since you a=
re using metal boxes could any of the shields in the boxes be touching the =
metal box which may be grounded? Ground loops can drive you Koookie ! !