Mfj Nuller will not work because the signal is in the same direction of my
300 deg pointing pennant.
My guess is that we should be able filter and shield properly at the source
Don
On Sunday, December 14, 2014, W2PM via Topband topband@contesting.com
Mfj Nuller will not work because the signal is in the same direction of my
300 deg pointing pennant.
There are a lot of popular misconceptions about this. The noise does always
not have to be a different direction, or even just one source.
The MFJ nuller and other similar systems will remove
Hi Tom,
Thanks, and my statement was too broad. In my case I am unable to meet the
conditions you mentioned (my sense antenna would not be much closer to the
noise, and it would not pick up the noise much better than the listening
antenna which is pointed in the direction of the noise source).
In Broadcasting, we used silver plating of tuned circuits often as copper
oxide, depending upon the degree of oxidation, is a poor conductor,
Silver oxide is a much better conductor than copper oxide.
In the High powered short wave station that I worked. the ABB Swiss made
transmitter plate
Galvanized can be a problem in some soils. This is the reason that galvanized
ground rods are no longer recommended in most applications (I think ON4UN even
has a pictured of a rotted galvanized ground rod in his book).
Copper-clad steel ground rods are more common and will generally hold up
Bill,
The Back Stay rod was to show with correct galvanization of the
1920's they stood up well.
The parentheses was a reference to wire used in antennas. I should have
added used in antennas.
Reading down a little further:
The ground wire information was to show that enameled
Galvanized can be a problem in some soils. This is the reason that
galvanized ground rods are no longer recommended in most applications (I
think ON4UN even has a pictured of a rotted galvanized ground rod in his
book).
Galvanized is a problem here. In the air on in the ground, galvanized
After some Googling and educated guessing, I have determined (and
received confirmation of) the following:
- It is a high-frequency surface-wave radar (HFSWR) system, developed
by Raytheon Canada for the Canadian military. It seems to be a new
version of the SWR503 MK2 HFSWR system. It is
Hi Doug,
Thanks for the follow up. I was saying 70 to 75 degrees, and 70 degrees
from my location puts me right where the W1FV 75 degree line passes below
the location you have identified. Interesting stuff.
Thanks,
Don (wd8dsb)
On Mon, Dec 15, 2014 at 12:42 PM, Doug Grant dougk...@gmail.com
I have done a little bit of research into the variable speed drive motors
that are commonly part of eco-friendly green HVAC systems.
I have found in many cases that the installer sells SEER-rated components
as part of their most efficient packages, but in most cases the
installation takes no
Ah, sorry if I misinterpreted what you meant.
Regarding proper galvanization, such things CAN still be had. There are two
kinds of galvanized products these days: flash galvanized, which is usually
not very useful outdoors, and hot dipped galvanized. The hot-dipped type
tends to look crusty
I believe 1900 to 2000 kHz is shared with radiolocation in the US also.
I'm just thankful it's not on 1815!!
73, Roger
_
Topband Reflector Archives - http://www.contesting.com/_topband
To add to what Jim had said about this smells like a Variable Frequency Drive
[VFD] (which I also think is probably what you're seeing here):
VFDs operate by varying the power to a three phase motor to control speed and
torque. This is done through PWM (Pulse Width Modulation) at a frequency in
I'm new to 160 and am planning to add an 8-circle. I would like to buy
commercial preamps and the controller. I would greatly appreciate any
advice on the choice of preamp/controller vendor.
I live in a rural area and have a 4-direction 3-ele vertical array for
160 with a 20+ dB f/b. So I'm
From:
Roger D Johnson n...@roadrunner.com
I believe 1900 to 2000 kHz is shared with radiolocation in the US also.
I'm just thankful it's not on 1815!!
73, Roger
That's correct. But the FCC has proposed to discontinue the radiolocation
allocation in that frequency range, and return the
Hi Tom
Thanks for your comments in the email below.
I have a 80m noise that is from a local house source and your comments below
have me thinking about how to implement a vertical noise sense antenna.
I believe the noise to be vertically polarized as my horizontal loop does
not have the
Raytheon Canada Limited is a wholly owned subsidiary of Raytheon Company
(NYSE:RTN), a 24 billion dollar technology leader specializing in defence,
homeland security and other government markets throughout the world. With
headquarters in Waltham, Mass., Raytheon employs 73,000 people worldwide.
- DXE wants a 320' diameter and Hi-Z wants 200' for optimum performance.
It's hard to tell what DXE performance is because it does not disclose
RDF, beam width or F/B. And neither vendor supplies EZNEC files so I can
see the effect of varying the layout. So I'm not sure how to decide what
The primary difference between DXE and Hi-Z 8 circle arrays is the fact that
Hi-Z uses ALL 8 verticals actively at the same time where DXE uses only 4 at
a direction.
Using all 8 verticals allows the use of a smaller diameter and a
performance edge on Directivity over the larger 4 active array.
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