[RFI] Peculiar Noise & detection

[bill steffey ny9h]

it was a rebuild on a slab   of a Plainfield St Mary's Immaculate 
catholic church blown down by a tornado. 1990 ...killed 29 !!!!

On 12/25/2023 8:40 PM, Jim Brown wrote:
> Thanks Bill. I think the incident I remember was at a south-suburban 
> church. Your memory may be better than mine.
>
> For those reading the mail, Bill was a manufacturer's rep for a bunch 
> of top pro audio companies, including some pretty nice test equipment. 
> Both of us had previously worked in broadcasting. We were good friends 
> in Chicago; about 15 years ago, we bailed from the city that Daley #2 
> destroyed, Bill to W. PA, me to NorCal.
>
> 73, Jim K9YC
>
> On 12/25/2023 4:57 PM, bill steffey ny9h wrote:
>> *IF THAT WAS ME *...   it was not from the wireless mic receiver; BUT 
>> unbelievably it was coming from an audio mixer that had a dc-dc 
>> converter gone wild.... I remember it well....   We (you and I 
>> sniffed it with my then crude SA) and then the factory flew up 2 guys 
>> with the legit spectrum analyzer.   ...and no one could believe 
>> it...till they saw it .. sweeping across the input of the wireless 
>> receiver..That sounded great on the NEW churches PA system.
>>
>>   still have two of those auto-mixers from 30 years ago...
>>
>>
>> On 12/23/2023 5:05 PM, Jim Brown wrote:
>>
>>
>>> On 12/23/2023 1:28 PM, k1ttt.dave at gmail.com wrote:
>>
>>> ........, we traced that sort of issue to instability in the preamp 
>>> for wireless microphone receivers. It helped that the contractor on 
>>> the project was a ham.
>>>
>>> 73, Jim K9YC
>>>
>>>
>>>
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>>
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