Re: Strange Things that Happen!!!

[RTS <gafa@xxxxxxxxxxxxx>]

On 9/26/2022 6:50 PM, Jim Davis wrote:
> 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:
>>> On 9/24/2022 9:49 AM, ABLE1 wrote:
>>>> Hey All,
>>>>
>>>> I don't know if anyone here (other than me) does work
>>>> on School Sound PA System.  Recently I had to add
>>>> six(6) Modular Class Room Speakers to the School System.
>>>>
>>>> Pulled the speaker cables (22/4 Shielded) from the office
>>>> system to each of the classrooms.  This all happened before
>>>> school started 4 weeks ago.  I was just informed that the
>>>> one room M-105 there was noise of some kind on the Listen.
>>>>
>>>> If you don't know. When the Listen Button is pressed you can hear
>>>> what the teacher is saying and then when you press the Talk
>>>> Button the teacher can hear what you are saying.  Similar to
>>>> a basic Intercom System.
>>>>
>>>> Well the sound is a Tikity Tikity Tikity in the background.
>>>> To make a long story shorter.  I think I figured it out today
>>>> that when I made a splice on the wires I left a 4-5" tail and
>>>> beanie spliced each wire and then folded the wire inside a
>>>> metal 4"x4" box with metal cover.  In the same closet there
>>>> is a Security Panel, Fire Panel, and some IT Network Data
>>>> Switching.  The Data Switch has a Cooling Fan and it is making
>>>> a noise of sorts.
>>>>
>>>> What I ended up doing was to take some Tin Foil and wrapped up
>>>> the spliced wires and stuffed it back into the box. I know it is
>>>> early but the Tikity Tikity Tikity has gone away.
>>>>
>>>> At least to MY EARS!!
>>>>
>>>> I am thinking that the fan or something was putting out some RF Noise!!
>>>> And the wire tails were picking it up and amplifying it to the office.
>>>> Adding the Tin Foil has blocked the noise and hopefully fixed the issue.
>>>>
>>>> I will know more when staff gets in on Monday...................
>>>>
>>>> Hope you enjoyed the read!!!
>>>>
>>>> Les
>>>>
>>>
>>>
>>> So inclusion a tin foil may actually stop the voices.
>> LOL
>>
>> 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, between 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?
> Did the clicking sound like if might come from a an alarm keypad? Like the sound you get with a wire toner probe?
> .
> Also, some of the three separate types of fire alarm system signaling paths can emanate clicking sounds. From initiating device circuits (IDC), signaling line circuits (SLC), and notification appliance circuits (NAC). Depending upon the type of panel being used
> and if any of your audio connections have exposed pigtails (Even the tiniest strand )they can act as an antenna.
> .
>   Also are you grounding one end or both ends of the shield? And since you are 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 ! !


For a new appreciation of "Foul" language..
.
Get a system with "intermittent" ground loops..
or
a system in the neighborhood of several high power
2-way radio's (or even low power if there the home built
versions..)
RTS
--

*Rocky T. Squirrel, esq.*