[RFI] Peculiar Noise & detection
Jim Brown
jim at audiosystemsgroup.com
Mon Dec 25 20:40:49 EST 2023
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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