[Elecraft] Plasma TV Noise any ideas on how to filter it out.

[vr2xmc]

I used ANC in the past. It was good.

Sent from my  iPhone 4

VK7JB <zendoc at netspace.net.au> 於 2010年11月27日 下午2:18 寫道：

> 
> Well, 80% of my operating time is spent in what seems like electromagnetic
> hell.  The irony is that I live in a rural area at the end of the earth.  I
> have only 3 neighbours within a 4km radius.  One of them has a plasma screen
> TV.  Another has something else, perhaps an arcing thermostat or fluoro
> light, which adds to the cacophony which dances across the whole of my
> operating spectrum, from 80 to 10m.  The din varies in intensity and
> duration. Sometimes it's not there and then, for a brief time, I enjoy the
> silence.  
> 
> I was about to abandon the hobby,  but some reading led me to the "noise
> cancellers".  I had learnt very early on that "noise blankers" and DSP were
> feeble weapons against the particular noise mix at my QTH.   So I first
> bought the MJF 1026 because I could get it locally and it was inexpensive. 
> I experiemented with many different noise antennas.  It was OK, but very
> inconsistent in its effect.  On a good day, it reduced the racket, but the
> nulls were elusive and the time I spent using it merely amplified my
> frustrations.  I took it apart one day and was shocked.  I boxed it up, put
> it in a cupboard and ordered an ANC-4.    My hopes weren't high, but the
> future of my ham radio career depended on finding a solution.  So the ANC-4
> arrived from across the Pacific- sturdily designed, heavy, and well crafted
> inside and out.  I pluged it in, attached the noise antenna, turned it on
> and for the first time, killed the noise.  On all bands, quickly and without
> frustration.  S7 din, obliterating everything, consistently and predictably
> reduced to hush.
> 
> This one piece of equipment has saved the hobby for me.  At my location and
> with my particular noise blend, it has worked a treat and much, much more
> effectively than the first noise canceller I tried.   Others have reported
> exactly the converse experience - neither unit having any effect, or the MFJ
> unit giving superior results.  For all the science involved, noise busting
> with this equipment is inexact and unpredictable.  
> 
> Of course, I'd rather not have to use this black box at all.   It  reduces
> received signal strength noticably, but then the alternative is
> buzzzzzzzzzzzzzzz covering everything.  And yes, I'm sure it's degrading my
> IMD and threatening the purity of any number of other parameters of my
> transmitted signal.  But again, the option is nothing at all.   This
> afternoon, I just put the 94th country in my log:  all were caught on SSB
> phone, with 100 Watts and a wire antenna sitting here under my blanket of
> noise.   I enjoy this hobby far too much to let it go.
> 
> Borrow an ANC-4 and see what it'll do for you.  If it doesn't work, then try
> the MFJ 1026.   Just don't give up.
> 
> 73,
> 
> John
> VK7JB
> 
> 
> 
> -- 
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