[RFI] DFing an HF RFI source
n6kj.kelly at gmail.com
Tue Oct 17 14:27:47 EDT 2006
Maybe, but in this suburban city of 30,000 people electric fences are
pretty rare :-) Electric blankets tend to have 1Hz "ticks" too. If I
can narrow it down to one house I may be able to talk to the owner to
find out what it is.
On 10/17/06, Pete Smith <n4zr at contesting.com> wrote:
> In my experience, 1-Hz "ticks" are almost always an electric stock fence with a problem, such as a wet post or weeds partially shorting it to ground, causing an arc. However, they aren't band-specific.
> 73, Pete N4ZR
> At 11:22 AM 10/17/2006, Kelly Johnson wrote:
> >Thanks. I was able to track the source down to one of 3 houses using
> >a whip antenna. I'll need something more directional to narrow it
> >down further OR go house to house. The houses are about 200 yards
> >away or so. I'm really curious what device is causing this problem.
> >It only seems to affect 17 meters and it sounds like a "tick, tick,
> >tick" at about a 1Hz rate.
> >On 10/16/06, Jay Bareman <Radio_Q at mchsi.com> wrote:
> >> Hello and sorry for the delay in responding to this thread. I had almost
> >> the same noise and DF problems here and asked the group about it back in
> >> November 2005
> >> http://lists.contesting.com/archives//html/RFI/2005-11/msg00005.html
> >> In my case, with the bands being so dead, I just ignored it as the owner of
> >> the house is a bit of a 'weird dude' so I chose not to confront him without
> >> some more suspicions of what I might be looking for.
> >> Fortunately for me, something changed and I have not had the noise for
> >> several months now.
> >> I guess the bottom line to my message is that 1) keep walking around and you
> >> will likely find it within a block or so of your qth. 2) Look for coax
> >> coming out of his telephone network box (DSL ?) 3) If you have a 'nice
> >> neighbor' and are able to figure it out, I know the list would love to hear
> >> what you found!!
> >> 73's
> >> Jim K5QQ
> >> -----Original Message-----
> >> From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
> >> Behalf Of Kelly Johnson
> >> Sent: Monday, October 02, 2006 6:57 PM
> >> To: rfi at contesting.com
> >> Subject: [RFI] DFing an HF RFI source
> >> I have an RFI source in my neighborhood that I'd like to track down,
> >> but could use some advice.
> >> The noise source sounds like a "click" or small burst of energy at
> >> approximately 1Hz. In other words, I hear a burst of RFI a little
> >> faster than once per second. It seems to be relatively narrow band.
> >> I don't hear it below 17 meters. It is strongest on 17 meters, but I
> >> can sometimes hear it on 15 meters and maybe even 10. I've never
> >> heard it above that. I have DF'd the general direction using my tower
> >> mounted HF yagi and the RFI peaks at about S7 or S8 on 17 meters which
> >> is fairly strong, however I can't hear it when I walk the neighborhood
> >> in that direction with my FT-817 and a whip. I obviously can't carry
> >> a 17 meter yagi around the neighborhood. What other decent antenna
> >> can I use to DF something doesn't appear to be broadband enough reach
> >> into the VHF region?
> >> FYI - The strength of this noise source varies from day-to-day and
> >> some days I don't hear it at all, but it's there most of the time.
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