[RFI] Oscilloscope requirements for power line noise locating

Cortland Richmond ka5s at earthlink.net
Sun Dec 30 12:35:56 EST 2012


Even an audio scope is good enough if you first rectify the RF to 
recover the envelope. I presume that's what they were talking about WRT 
the Sadelco (etc.) FS meter.  These old CB meters' sensitivity increases 
with frequency (until the sampling baod nears resonance, anyway) but you 
can use a toroidal style meter to get a pretty level response.

For DIY directional couplers, check out (for example)


On 12/29/2012 1610, N1BUG wrote:
> I have some more questions. I have been re-reading relevant sections 
> of Loftness' book on using an oscilloscope with a Sadelco (or similar, 
> presumably) field strength meter but it isn't all coming together for me.
> For this purpose, what are the minimum scope specifications for 
> acceptable performance (bandwidth and otherwise)? The two scopes 
> referenced in the book appear to be 40 and 60 MHz units. I don't see 
> why that bandwidth would be needed. Is it? ...

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