Re: AM radio
Posted by
wabobill on
URL: https://www.es-forum.com/RxDNA-and-MxDNA-Noise-Reduction-Technology-Dissipative-Noise-Attentuation-tp2224202p2260179.html
Isn't the Stetzer filter in a working range of 4kHz to 100kHz so Isn't the AM radio a bit out of range with its 500 - 1600 khz Marc ?
If you take a good feeling approach for filtering effectiveness maybe the narow 4kHz to 100kHz filtering capability of the stetzer arent enoughf ?
The RxDNA is approximately 5 Khz to 500 Khz in range ...maybe this does make a difference for some !
The guy who prone me these one told me about his particular home condition and the bad feeling he got with the Stetzer filter as they actually worsen the problem (more EMF)and then install the RxDNA and had such a calm feeling after installing them so that's why I was asking if they where really that good !
Anyway I have 2 old 70's hand held 9V AM radio ... Im gonna make some more test to try this theory :)
--- In
[hidden email], Bill Bruno <wbruno@...> wrote:
>
> 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 <marc@...> 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]
>