Re: [IRCA] HDTV hash solved! (whew...)

["Rene Tetro" <rene@xxxxxxxx>]

A couple of months back our radio station's production director
received a knock on his door about 8PM one night.  It was an FCC
inspector.  Now, of all the people at the station, I always assumed
it would be me who got the knock -- after all, I'm the one with all
the gadgetry.

He was going from house-to-house in that block looking for someone
with equipment that was putting out a strong signal right on the
frequency of Philadelphia International Airport's localizer.  It
turned out to be our production director's next door neighbor whose
HDTV converter box was emitting a spur through the TV antenna.  

Ya gotta wonder how some of these things are built......

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx
[mailto:irca-bounces@xxxxxxxxxxxxxxxx] On Behalf Of
satya@xxxxxxxxxxxx
Sent: Friday, February 27, 2009 1:18 PM
To: irca@xxxxxxxxxxxxxxxx; ultralightdx@xxxxxxxxxxxxxxx
Subject: [IRCA] HDTV hash solved! (whew...)

Hi all:

Thanks to the many suggestions and ideas.  I tried 'em all, and the
one
that worked was to minimize the length of coax between the little
UHF
circular antenna and the converter box.  The converter box itself
gives
off a little RF but only up close, similar to most modern
electronic gear.
 However, when you hook up an external antenna, the digital
converter
apparently radiates the noise over the antenna feed cable.  I had
an
elaborate switching network for when I utilized more than one
antenna, and
bypassing all that got rid of the noise.

Hope this helps someone else faced with this problem!  "Hash" is a
gentle
descriptor - it was more like a solid high-pitch whine/buzz which
precluded DX on the lower band.  Fortunately, peaceful coexistence
has
been restored between my DXing and the girls' TV viewing (in fact,
the
signal on the TV is a little better!).

Thanks again - Kevin S
Bainbridge Island, WA


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