56:19
Subject: Topband: magnetic loops, DXE vs Wellbrook
I have used a DXE loop (formerly Pixel) for the last couple of seasons
with fairly good success from my small lot. I was able to get a
Wellbrook loop this ye
On 11/2/2021 4:56 PM, WW3S wrote:
with the DXE, the band noise present on my inverted L just about
completely disappears when I switch to the loop, but with the Wellbrook,
I notice very little difference
Perhaps the DXE does a better job of isolating the loop from the
transmission line? Only
I have used a DXE loop (formerly Pixel) for the last couple of seasons
with fairly good success from my small lot. I was able to get a
Wellbrook loop this year as well, and in testing, notice quite a
difference between the two.the Wellbrook is very noisy compared to
the DXE, and I'm wonderi
Your forgetting that the front end is still broadband and wide open and
being blasted into intermod many times. These days not everyone is blessed
by the latest gigabuck rig which still is wide open until it hits the
roofing filter which wouldnt be there if there werent problems.
My first
Your forgetting that the front end is still broadband and wide open and
being blasted into intermod many times.
Someone would need to have grave noise level issues if noise overloaded the
front end. They would not hear much of anything with or without a loop. Look
at receiver specs for 20 kHz
Actually a properly designed purpose built loop can offer a reduction in
noise from the high Q selectivity offered.
That would only be true if the receiver system noise bandwidth was wider
than the loop's bandwidth. If you had a SkyBuddy with 30 kHz noise BW and
put a 5 kHz wide loop in front,
Actually a properly designed purpose built loop can offer a reduction in
noise from the high Q selectivity offered.
A 2 turn balanced loop made from 1" mostly air dielectric CATV hardline has
been in use here for over 25 years. Diameter is about 44" and mounted in the
woods on an old TV rotato
Gary wrote on May 21.
I've had a Wellbrooke loop for a few years at 20' on a TV rotator. It
nulls a single nearby QRN source NW at 300 deg true. EU is about 15-30 deg
from here. When 160 or 80 are open over the N Pole, it often helps me hear
the weak.
It's less effective on multi-source QR
Thanks Tom for the explanation. As always, this is a learning Reflector. Part
of my location involves potential BCB, power line, adjacent home electronics,
and of course the legal limit transmissions close to the loop/feed/rotator
controller. Common mode supression is an absolute requirement on
Expecting this and given the proximity of my transmission antennas to the
Wellbrook Loop (50-100'), I put 10 Type 31 slip-on beads over each end of
the RG8-X feed and rotator control cable, and insulated the loop from the
rotator with CPVC plumbing pipe.
Common mode shunt impedance is what l
Expecting this and given the proximity of my transmission antennas to the
Wellbrook Loop (50-100'), I put 10 Type 31 slip-on beads over each end of the
RG8-X feed and rotator control cable, and insulated the loop from the rotator
with CPVC plumbing pipe.
Did it help? Maybe. I get no feed line
Tom W8JI wrote:
> If you test some popular loop antennas for pattern, which I have done, you
> will find many have significant skewing in the nulls. The nulls often are
> not 180 degrees apart. This proves the loop is in multiple modes, one of
> which (electric field probe) would involve mast and f
If you test some popular loop antennas for pattern, which I have done, you
will find many have significant skewing in the nulls. The nulls often are
not 180 degrees apart. This proves the loop is in multiple modes, one of
which (electric field probe) would involve mast and feedline radiation. Th
Richard Karlquist wrote on May 21.
It is important to understand that these loops have
a circumference of 10 feet, which they are limited
to because the manufacturers want to offer a bandwidth
up to 30 MHz. Also, they are untuned, again because
the manufacturers want to offer a broadband solut
I've had a Wellbrooke loop for a few years at 20' on a TV rotator. It nulls a
single nearby QRN source NW at 300 deg true. EU is about 15-30 deg from here.
When 160 or 80 are open over the N Pole, it often helps me hear the weak.
It's less effective on multi-source QRN, but still helps at times
At best mag loop lowers the noise in two directions drastically - along
with any signals in those two spots. But in the non null areas there are
absolutely no characteristics of the loop which are beneficial for DX
other than getting whatever you may get. Also know the loop has no
vertical or
I have the Wellbrook at 2 QTHs and it works way better than using a transmit
antenna on receive. It also works very well early in the evening when signals
are still iffy and coming in at all angles. My 300 foot beverage on ground
starts to be quieter and therefore more effective later in the eve
A better and easier and lower cost solution IMHO would be a pair of
phased K9AY by using the MFJ-1026 and adjusting them for the best null
on the noise location. Unfortunately this will also reduce the signal
from the nulled direction but would allow some slicing of the noise from
the shack w
[mailto:topband-boun...@contesting.com] On Behalf Of Bob K6UJ
Sent: Tuesday, May 21, 2013 10:40 AM
To: topband@contesting.com
Subject: Topband: Magnetic Loops
Sometimes my local power line noise is about S8 or so on 160.
I am considering the purchase of one of these magnetic loop antennas for
Covered many times here over the years. Yes mag loops wil help loads with local
crud noise if they are in a certain direction you can null to. If the noise is
all surrounding as it would be in many high density residential areas like
condos or industrial zones prob not.
At best mag loop lowers
On 5/21/2013 8:40 AM, Bob K6UJ wrote:
Sometimes my local power line noise is about S8 or so on 160.
I am considering the purchase of one of these magnetic loop antennas for
receiving to see if it helps.
Anyone have one of these ? How well does it perform ? One better than the
other ?
Pixel T
: Magnetic Loops
Sometimes my local power line noise is about S8 or so on 160.
I am considering the purchase of one of these magnetic loop antennas for
receiving to see if it helps.
Anyone have one of these ? How well does it perform ? One better than the
other ?
Pixel Technologies RF PRO-1B
Sometimes my local power line noise is about S8 or so on 160.
I am considering the purchase of one of these magnetic loop antennas for
receiving to see if it helps.
Anyone have one of these ? How well does it perform ? One better than the
other ?
Pixel Technologies RF PRO-1B
Wellbrooke Commu
All:
I can comment on my experiences with a magnetic loop, as I have one,
along with three one-wavelength beverages, and a pennant terminated
loop. Each of those antennas, at one time or another, proves its
worth as a receiving antenna at my station. In terms of signal to
noise ratio, the Bevera
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