K2 receiver "hash" or "artifacts"

[Donald Currier]

> Hello All,
>
> New to the list, as I just completed #5885. With the exception of a  
> couple of wrong turns, the build went great. My radio was completed  
> about 1 week ago, and I recently noticed that I have some "hash",  
> or "artifacts" on receive on specific frequency's. I.E., I don't  
> have hash across an entire band, only on particular frequencies.  
> Otherwise, the radio seems to be operating as expected.
>
> Eg. on 20 meters, the hash starts at about 14190, gets loudest at  
> about 14200, and goes away at about 14212. I have other similar  
> problems on other bands, but 20 seems to have the loudest  
> occurrence of the problem, over the widest frequency span.  
> (Although other bands have some noise, it doesn't span 20KHZ like  
> it does in the aforementioned 20 meter example).
>
> Any help with where I might start looking for the source of this  
> problem would be greatly appreciated!
>
> Thanks es 73 de Don
> W0DJC
> K2 #5885

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[Don Wilhelm-3]

Don,

I would believe that hash is coming from devices used around the house (or
your neighbor's).  Ethernet modems and routers, computers, switching power
supplies, wall-wart power supplies, touch lamps, lamp dimmers.

Anything that uses switching technology can produce such hash over a small
frequency range and the range may shift with its load.

You can verify that by killing all the power im your house and running the
K2 on a 12 volt battery for the test.

I hear hash of that nature on the simple antenna that I use at the
workbench, but do not hear it when I use the 'proper' antennas in the
shack - these antennas are located about 100 feet from the house so they do
not pick up  the noise sources.  It also helps that I have a stucco house
where the stucco wire mesh acts as a shield to keep the noise inside - but I
don't dare consider inside antennas either, they too would be shielded.

73,
Don W3FPR

> -----Original Message-----
> >
> > New to the list, as I just completed #5885. With the exception of a
> > couple of wrong turns, the build went great. My radio was completed
> > about 1 week ago, and I recently noticed that I have some "hash",
> > or "artifacts" on receive on specific frequency's. I.E., I don't
> > have hash across an entire band, only on particular frequencies.
> > Otherwise, the radio seems to be operating as expected.
> >
> > Eg. on 20 meters, the hash starts at about 14190, gets loudest at
> > about 14200, and goes away at about 14212. I have other similar
> > problems on other bands, but 20 seems to have the loudest
> > occurrence of the problem, over the widest frequency span.
> > (Although other bands have some noise, it doesn't span 20KHZ like
> > it does in the aforementioned 20 meter example).
> >
> > Any help with where I might start looking for the source of this
> > problem would be greatly appreciated!
> >
> > Thanks es 73 de Don
> > W0DJC
> > K2 #5885
>

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10:19 AM

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