[RFI] Oscilloscope requirements for power line noise locating
paul at n1bug.com
Sat Dec 29 16:10:09 EST 2012
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?
I don't yet understand exactly how he triggered or set up the scope
to obtain a stable trace in the field. I do NOT have extensive
experience with scopes so I may be missing something basic here.
Using my HP 1980B scope at home, I had to resort to external
triggering from the AC line to get a stable display when viewing
power line noise pulse groups from my station receiver. However that
scope has digital controls and sweep rate is not infinitely
adjustable. I wouldn't be able to trigger off the AC line in the field.
Would anyone have recommendations for inexpensive scopes suitable
for this purpose that can run from internal batteries? Everything I
use in the field ABSOLUTELY MUST be 100% portable and able to be
hand-carried. Anything that is not is useless to me.
I am considering selling off part of my ham station to assemble a
noise locating system with a field strength meter (providing video
output), oscilloscope, and log periodic dipole array antenna. But
first I need to get a better picture of what it's going to take.
Paul Kelley, N1BUG
RFI Committee chair,
Piscataquis Amateur Radio Club
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