[HCARC] Antenna question

[Harvey N. Vordenbaum]

There are many sources of noise to get into radios.  If it has a 60/120 Hz
component it is electric line noise related.  Neighborhood distribution
lines are notorious for generating noise due to bad connections, components
breaking down, etc.  And many things operating off line power can make noise
too, motors, thermostats in heating pads, etc.  Old TV sets radiated
harmonics of 15755 Hz from the horizontal output transformers driving the
CRTs.  
I don't have any experience with electric fences, but I wonder if they
couldn't make noise with those miles of wires attached.  What happens when a
blade of grass is in contact with a charged wire?
Of course now there is a new world of possible sources with digital cable,
computer  and TV signals all over the place.
Where to start?  Turn off things in your house as much as possible. Go
around with a transistor radio tuned to the high end of the AM broadcast
band with the volume turned up.  The magnetic rod antenna used makes a
fairly directional antenna you can point at  the source.  Hold it up to the
entrance panel and where your phone and cable line come into the house and
hear if it is there.  I'm sure there will be some as I have.
Right now I have a noise source that repeats at 18 kHz intervals across the
10 and 12 M bands.  It  is worse when my beam is pointed at the neighbors
house, but that happens to be in line with my house too.  I haven't bugged
them about it yet, especially since they haven't complained about my big
tower.  But sometime when they are out of town I'll have to snoop around
their house. :-)
Too bad I don't have the mobile HF setup anymore so I could drive around the
neighborhood and listen too.
Good luck
Harvey
K5HV


-----Original Message-----
From: hcarc-bounces at mailman.qth.net [mailto:hcarc-bounces at mailman.qth.net]
On Behalf Of rowen at owencomps.com
Sent: Saturday, July 13, 2013 7:00 PM
To: hcarc at mailman.qth.net
Subject: [HCARC] Antenna question

I have a multiband dipole tuned to 1.1:1 on 10m.  I have noise to s8.  In my
truck I have s3.  Any ideas on reducing the noise?

Ray owen Kf5vnc
830.998.0914

Sent from my Verizon Wireless 4G LTE Smartphone

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