I think the fact that something positive is being done is working, even if it
is electrically futile it is definately putting some DQRM'ers off, the DQRM has
been noticeably less and with K1N ops and others reminding the offenders that
something is happening is a plus. The triangulation would
On Sun,2/8/2015 6:22 AM, Mike Waters wrote:
The RBN is a good idea, and I use it occasionally. But I don't think
everyone uses it. For one thing, it takes more CPU power, RAM, and
bandwidth than what everyone has.
It's easy to get RBN spots. Simply use VE7CC's cluster program, and
connect to
On Sun,2/8/2015 6:45 AM, Milt -- N5IA wrote:
There has never been any indication of the messenger wire inducing any
external noise onto the signals.
Nor would any be expected unless the coax shield became degraded. And in
that event, the coax shield would cause in ingress whether the
I think Mike has a point. In TV use, the messenger cable is isolated from the
signals
flowing thru the interior of the coax. For a Beverage antenna, it's the outside
of the
shield that picks up the signal. I don't know if the closely coupled messenger
wire
would have a detrimental effect or
I can imagine some installation scenarios where the messenger cable might
pick up noise that coax alone would not. But would that *always *occur? The
messenger cable is, after all, in the same location as the coax shield.
73, Mike
www.w0btu.com
On Fri, Jan 30, 2015 at 4:50 PM, Carl
Thanks for all the replies!
The RBN is a good idea, and I use it occasionally. But I don't think
everyone uses it. For one thing, it takes more CPU power, RAM, and
bandwidth than what everyone has.
I tried to spot myself on a cluster, but apparently self-spotting is
disabled. I don't know how
I have installed and used messenger cabled RG-59, RG-6 and 1/2 hardline for
years. The current installation at N5BG/NI5T has more that 6,000' of 1/2
hardline w/ messenger on poles (three separate runs of 2,000'+) from the
Beverage collection, signal splitting and selection point to the shack.
IIRC, quite some years ago, QST had a photo description of
a FCC signal locator (for lack of a better description) consisting
of several remote receivers that were linked together.
Anyway, these could instantly locate the origin of a
skywave signal with a resolution of a city block(!!) using
Tom said-
Message: 10
Date: Sat, 7 Feb 2015 23:58:32 -0500
From: Tom W8JIw...@w8ji.com
To:topband@contesting.com
Subject: Re: Topband: K1N DQRM Tracking Project
Message-ID: 94B927F7C90146B19C8C27DE0BC0388D@MAIN
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
A couple of observations;
The DQRM with EP6T was by far the worst I have ever heard. My guess
is a lot of it was because of angry people who did not like Iran as
the DX location. If that is correct, I suspect the next P5 operation
will be as bad if this isn't corrected somewhat.
I am always
If anyone wants to look at the antennas, the exact addresses of all the FCC
HF DF sites are in this document:
transition.fcc.gov/omd/contracts/pre-award/RFQ1124.pdf
Type the address, city, and state of the FCC site you want to examine into
Google Maps and zoom in.
There is much more
A poster on the cluster said it the best:
DQRM triangulation = nonsense idea!
There is no way this is going to identify the offending station(s).
IMO at best a bluff.
Doug
-Original Message-
Is anyone using this DQRM Tracking Project report? They want reports of
deliberate QRM like
I don't remember the article, Charlie, but that's a fabulous idea, and at
first blush it doesn't sound all that hard to implement. One way might be to
set up three receivers at different locations, each with a 10 MHz GPS or
rubidium time base (both inexpensive and readily available.). For each
Amen!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Doug
Renwick
Sent: Sunday, February 08, 2015 2:34 PM
To: topband@contesting.com
Subject: Re: Topband: K1N DQRM Tracking Project
A poster on the cluster said it the best:
DQRM
I didn't see the ARRL article, but I have researched this on the Web. Type
these words into Google:
fcc hf df
The first hit is a map of where they all are. Most are unmanned. They are
all linked to a single manned command center.
I'm not certain what type of antennas they use. I studied the
I can't believe that an unterminated wire hundreds of feet long in parallel
with the
Beverage wire and, in close proximity to it, would not have a deleterious
effect.
73, Roger
On 2/8/2015 1:13 PM, Jim Brown wrote:
On Sun,2/8/2015 6:45 AM, Milt -- N5IA wrote:
There has never been any
If you did locate the offender what would you do?
You could report him (or her) to the FCC but the FCC would probably not act
until they could catch the offender in the act.
These DQRM offenders act sporadically so it would be difficult to track them
down.
What is the offense? This is not
I don't remember the article, Charlie, but that's a fabulous idea, and at
first blush it doesn't sound all that hard to implement. One way might be
to
set up three receivers at different locations, each with a 10 MHz GPS or
rubidium time base (both inexpensive and readily available.). For each
To put this in perspective, I have some familiarity
with surveillance systems used by government agencies
to search for sources of RF such as cell phones,
listening devices, etc in secure locations. It has
some analogies to the DQRM problem. Using relative
amplitude doesn't work very well to do
A friend of mine told me recently that he has had the electrical utility
company out several times to fix noise problems and without ever leaving his
house tells them exactly which pole is the culprit. Further, that they were
always happy to help because he has not been wrong yet.
OK, so how
Greetings top-band community,
Interestingly enough the technology exists right here in our own Ham
community that could go a long way toward finding these DQRM culprits.
There are some beam forming arrays that operate with SDR technology
where a recording can be made of a target bandwidth
I surely don't think so! I don't expect that there is any way, unless ALL
amateur transmitters were equipped with an embedded address encoder and
supplied the owner/operator's call and the station GPS coordinates!!
My $0.02
73,
Charlie, K4OTV
-Original Message-
From: Topband
I agree, Lee. Locating a DQRM station involves accurately time stamping the
arrival time of their transmissions, at (at least) three receivers at known
locations. Once the arrival times are known, one can use trigonometry to
calculate the location of the interfering station. Since radio waves
Are you sure that will work with sky wave signals?
73
Peter
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Lee K7TJR
Being able to actually replay an entire contest and do a strength and
directional analysis in a narrow bandwidth after the fact
No of course not Peter,
I think it would work fairly well on one hop and ground wave signals
judging from my experience with narrow beam arrays.
As much skewing as we see on distant signals and the fact that we are
looking at beamwidth in degrees pretty well says there is no way of DFing
with
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