Posted by
BiBrun on
URL: https://www.es-forum.com/RxDNA-and-MxDNA-Noise-Reduction-Technology-Dissipative-Noise-Attentuation-tp2224202p2258778.html
For a while I had one. It picked up some things, but
usually I found using it in AM mode was sufficient.
I think for most sources, it's better to have as big a bandwidth
as possible. Cheaper radios usually have broader bandwidth.
I'm also starting to think, if you get to really big bandwidth,
you want to make sure the system is "phase linear" which
means only first order filters (The Ramsey ABM1 has incredible
18MHz bandwidth, but the filters are not first order so the bandwidth
is basically wasted unless you build it from the kit version and
bypass the filters).
The MFJ-856 has about 100kHz bandwidth, versus about 10kHz
for an AM radio, and I have reason to think it is phase linear.
There is also a version with a smaller nondirectional antenna
which LessEMF sells as the Power Line Noise Finder or something.
I think anyone who has $160 left after buying their microwave
meter should get one of these. A Tri-field meter is good to have
too, (with 100x external probe if you have low enough fields)
but for some people the MFJ-856 will be more important.
On Fri, Jan 14, 2011 at 1:03 PM, Marc Martin <
[hidden email]> wrote:
>
>
> > Use an AM radio
>
> Question:
>
> An AM Radio is commonly recommended here as an alternative to an EMF meter.
> An AM Radio receives signals from 500 - 1600 khz.
>
> I'm wondering if there would be any advantage in seeking out a radio
> that receives "longwave" broadcasts (150 - 300 khz), or "shortwave"
> broadcasts (1700 - 30000 khz). Perhaps there are some harmful frequencies
> that would be picked up by these radios that are not picked up by an AM
> Radio?
>
> Marc
>
>
[Non-text portions of this message have been removed]
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