[RFI] Peculiar Noise & detection

[Jim Brown]

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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