[hpsdr] spikes

[Dick Faust]

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Dick K9IVB

Erik Anderson wrote:
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>   
>
> ------------------------------------------------------------------------
>
> Okay, after a couple weekends of "no HPSDR radio found" I managed to 
> get everything to power up again and... the signal seems clear.  At 
> least clear enough to hear people talking from the other side of the 
> country (although WWV is still extremely faint).  At this point I'm 
> not sure whether it's the new firmware, new software, new ethernet 
> cable, new refrigerator, or different radio position (are wood stoves 
> considered grounded? it's a rather large hunk of metal in any case), 
> although I'm grateful that the thing seems to be working again.
>
> I am still interested in knowing where I can buy "red coils" or 
> something usefully equivalent, in the case that I still decide to make 
> my own HPF (at least before spending the money for Alex).  I'm 
> assuming that TAPR likely has very few of these available (if any), is 
> there a good website I can go to where I can at least learn the 
> difference between red coils and black coils?
>
> On Fri, Feb 24, 2012 at 7:23 PM, Erik Anderson 
> <erikba at odysseus.anderson.name <mailto:erikba at odysseus.anderson.name>> 
> wrote:
>
>     My wife is likely to be out of town this weekend so it may be a
>     good time to "shut down the house" and see what happens.
>
>     The fact that I saw the same pattern at the local ACS meeting
>     (which I think was inside of an unused aircraft storage bay) but a
>     clean signal east of the mountains leads me to believe that (1)
>     it's not my equipment (it would be nearly impossible to resolve if
>     my netbook was the source) and (2) it's not a _single_ piece of
>     equipment that is doing this.
>
>     Even if I track down the local source of interference, it still
>     doesn't really give a solution as to what to do with it (if I
>     can't avoid it).  The closest thing I can think of is (1) make
>     sure the case is as close to a faraday cage as possible (i.e.
>     ground the heck out of it) and (2) stick a ~1 MHz HPF on the
>     incoming antenna connection and hope that all the spikes are just
>     harmonics (may start out with a single tuned inline capacitor as
>     coils seem to be more difficult to find).
>
>     Thank you all for your feedback here.  I do feel bad for asking so
>     many people for help for so long a time in this, hopefully this
>     will help focus me on resolving this.
>
>     I'm actually surprised that the Extra test covers so much of this
>     kind of stuff too, which was a nice kick in the butt on learning
>     how to fix this...
>
>
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