Many electric company employees' are from families that have worked in the
industry for several generations. If they worked in the plants they would be
near hundred+ megawatt generators for decades. No one ever worried about it or
saw problems.
To the original poster: the large transmission
I picked up an NCC1 and I am trying to determine just how much I should
invest in the receiving antennas for my home (urban) QTH.
I am in a typical neighbourhood with a treed greenspace at the back of the
house and about 300M from the house beyond the green space is the 500KV
lines from one of
You/re right of course, it's 1 ft/nanosecond. Don't know what I was
thinking. I was also focusing on CW DQRM, since that is 99% of what I
operate, and since carriers and CW jamming havw been endemic on the
Navassa
dxpedition's top band and 80m operations. I agree that for SSB
interference,
Out west we have the Pacific Dc Intertie, a 500KV system bringing power to So
Cal from Oregon. Is anyone aware of any noise issues with that?
Jeff W6JK
On Tuesday, February 10, 2015 9:53 AM, Ws9v w...@royell.net wrote:
Hi All
Through the center part of Illinois they have begun work at
You may have seen an old Wullenweber antenna array at one of those older
FCC sites. IIRC, one is (or was) on the east coast. AFAIK, the Wullenweber
is not used anymore by the FCC and is scheduled to be (or already has been)
replaced with a different --and far less complex-- antenna.
One thing the
Hi All
Through the center part of Illinois they have begun work at the government
level to install a 690,000 VDC power line As with all this there is huge
amount of opposition an even groups trying to ban it
Does anyone have any experience with a line of such high VDC as a noise source
?
Adding on, 200Ksps to 1 Msps 8bit (and more) A/D convertors are good
enough and cheap if one can store the data stream for a few seconds or
so and the stations are time sync'd to record. Then correlate the
wavefront to accurately resolve the time. A bonus is the transmitter
signature is
It was very strong, centred on 1915 kHz, around 0430 GMT, Monday 09 February
2014 (Sunday evening in N America).
Don k4kyv
_
Topband Reflector Archives - http://www.contesting.com/_topband
Skip,
I went on a road trip to Northern VE2 some years ago.
There was an enormous transmissionline near the road
we were on. I tuned in 1710 khz on the truck radio and
there was dead silence...NO RFI at all. I really thought
the line was maybe under construction but later I found
that it was
The actors on 14.313 were on the air for months. They also advertised their
calls so it was probably easy to track then.
It's different if a DQRM'er is on sporadically and on different frequencies.
I thought the Wullenweber was use by the Military, not the FCC.
Mike N2MS
- Original Message
On Tue,2/10/2015 10:27 AM, Mike Waters wrote:
That sounds almost too good to be true, doesn't it?
Not if you understand the physics and the details of how the lines are
built and maintained. ARRL publishes Marv Loftness's book on AC power
noise issues, which I added to my library a decade or
Through the center part of Illinois they have begun work at the government
level to install a 690,000 VDC power line As with all this there is huge
amount of opposition an even groups trying to ban it
Does anyone have any experience with a line of such high VDC as a noise
source ? It will
I don't think you would have noise from the line except if there is a fault
that is causing arcing at an insulator.
I'd hate to live near the end points where the AC to D and Dc to Ac conversions
are done.
Mike N2MS
- Original Message -
From: Jeff Kincaid w...@sbcglobal.net
To: Ws9v
I know this is about a long DC line, but I thought I would add something:
All the experiences I have ever read by hams living near HV AC transmission
lines carrying (for example) 69 kV or more seem to indicate that RFI seldom
is radiated from them.
Instead, it's the local lines on wood poles
My 160m antenna is unique in that I have never run into anyone else with
anything exactly like it. It consists of 127' of Rohn 25, insulated at the
base, with 120 buried radials each 133'6 long. Probably overkill, but I got a
good deal on a 16,000 ft spool of #12 bare soft-drawn back in
I would suspect that a DC HV line operator will pay A LOT of attention
to any arcing from what I've seen of HV DC arcs. Once the ionization
gets established and metal ions vaporized from the terminals get flowing
it avalanches until the protection circuits act. Small AC arcs are much
The wullenweber at the USCG electronics lab in Alexandria va (K4CG) was
available to any government agency
Who wanted to use it. It was used by the Navy, the USCG for search and
rescue, the FCC and we had other
Agencies come there who never actually identified what agency having made
arrangements
American Transmission Company built and activated a 345KW line right
thru Madison, WI two years ago. Huge towers, huge green glass
insulators. The line runs right past my XYL's office window, about 100'
distance. Once activated, I used a Gauss meter to measure the magnetic
field in her
Hello all,
I'd like to build an Inverted-L antenna. Unfortunately the vertical section
will be only 8m (26 ft) high and the radial system not great (maybe 5 to 10
wires laying on the ground)
The simulation (with MMANA software) indicate 3.5 +j0 Ohm impedance. This is
very low so I think most
Ady - you might consider using a Folded CounterPoise, designed by K2AV, for
your radial system. I have one on each of my Inverted L antennas; 160 80
meters. They work quite well if you do not have the real estate for a lot of
radial wires. My 160 Inverted L only goes up 35-40 feet bit with the
Wouldn't the timescale based on leading edge TOF, be the rise time of the
pulse?
For triangulating on lightning bolts by TOF, rise time doesn't seem to be a
limiting factor because lightning bolts are fast enough to be broadband
across many MHz.
But for ham CW transmissions (which would include
Hi Charlie,
You/re right of course, it's 1 ft/nanosecond. Don't know what I was
thinking. I was also focusing on CW DQRM, since that is 99% of what I
operate, and since carriers and CW jamming havw been endemic on the Navassa
dxpedition's top band and 80m operations. I agree that for SSB
On 2015-02-10 14:09, Adrian Fabry wrote:
The simulation (with MMANA software) indicate 3.5 +j0 Ohm impedance.
This is
very low so I think most of the power will be lost in the ground.
In order to raise the impedance, I would insert a coil (about 75 uH) on
the
top of the vertical section and
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