[RFI] Oscilloscope requirements for power line noise locating

Cortland Richmond ka5s at earthlink.net
Mon Dec 31 10:31:57 EST 2012


(Hitting forehead): I should have thunk.

Didn't connect the Sadelco name to the right KIND of FS meter. Heh. 
Memory is the second thing to go...

I have a Holland St5128s I want to add a scope (ideally, hand held) 
output to.   First I'll have to suppress its own display-generated RFI.

It's still pretty much the case that base-band video doesn't take a lot 
of bandwidth; more than audio, perhaps, but 20 KHz lets you see a lot of 
the envelope for signature identification. There's still portability. 
None of my SA's are really portable.  If I get any taxes back (hah) i 
may buy one of the new handheld spectrum analyzers to replace the 
Holland.  We have an EMI problem at our club station, too.


Cortland Richmond
KA5S
(Semi retired EMC Engineer
and EMC committee member)


On 12/31/2012 0920, N1BUG wrote:
> Thanks Cortland.
>
> The terminology they use is somewhat different than what most of us 
> would use. What they call a field strength meter in the CATV industry 
> is actually a frequency selective voltmeter - a basic tunable 
> receiver. Those meters have a video output intended to drive a scope, 
> which many have used to see power line noise signatures. But exactly 
> what is output on that port I honestly don't know. I may have to buy 
> one and look at what comes out of that port on my 100 MHz scope in the 
> shop to figure it out. It's probably supposed to be obvious, but... 
> not to me.
>
> 73,
> Paul Kelley, N1BUG
> RFI Committee chair,
> Piscataquis Amateur Radio Club



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