Yeah, but I think the point is that there are a lot of devices out
there that splash well beyond the frequencies they are suppose to be
in. I remember in the early 90's while developing some of the 802.11
original 2Mbps FH stuff that every day around lunch time we'd have an
awful noise floor. Turned out to be the office microwaves that were not
we'll shielded that well...after that I learned to stand rather far
away from those microwave's when cooking my lunch :)!
Bret
Philip Dorr wrote:
I do not know what frequency the first one is on, but the second one,
AM and 160/80/40 Meters, covers from 535kHz to 7.3MHz. (AM is
535-1705kHz, 160 Meters is 1.8-2.0MHz, 80 Meters is 3.5-4.0MHz, and 40
Meters is 7.0-7.3MHz) That is all way lower than most, if not all,
WISP equipment operates at.
On Tue, Jan 26, 2010 at 11:53 PM, Marlon K. Schafer
<o...@odessaoffice.com> wrote:
Some more ideas...
marlon
----- Original Message -----
From: "larryjspamme...@teleport.com" <lar...@teleport.com>
To: "Tower and HF antenna construction topics." <towert...@contesting.com>
Sent: Tuesday, January 26, 2010 3:48 PM
Subject: Re: [TowerTalk] FOUND THE NOISE PROBLEM
A little over a year ago, my new neighbor put up a nice flagpole in his
front yard, with some low-voltage spotlights controlled by a LV power
supply with a photocell. Every evening, about sunset, 80 and 160 meters
suddenly had a terrible noise level - I could even drive by his house
listening to the AM broadcast band in the car and hear the racket.
I took my portable FT-817 HF transceiver out with me while walking around,
and found that the noise was indeed coming from his place. Once I found
out exactly where all the noise was coming from, I took my AM portable
radio over and showed the neighbor. and I covered/uncovered the photocell,
turning on and off the noise along with the flagpole spotlights. When he
saw what was happening, he told me to go ahead and unplug the supply
completely (feeding the spotlights), and agreed to bury the LV wire
instead of leaving it lying on the ground from the supply to the lights.
Some of these LV supplies can make a huge amount of noise! Same with my
laptop PC supply - I have to unplug the supply and run on batteries only,
if I want to work 160/80/40 Meters while it's on. I've tried toroids on
the supply line (input and output) and the phone line - no help at all. I
hope that DXpeditions try their logging PCs and networks thoroughly before
leaving on a big trip, otherwise, they may be logging by hand and manually
entering the contacts into the PC log later, when they find out the PCs
keep them from hearing weak signals.
The noise I was picking up was on both an 80-Meter dipole, and a multiband
vertical, several hundred feet from the noisy flagpole spotlights.
LJ
-----Original Message-----
From: anthony <k...@cox.net>
Sent: Jan 26, 2010 3:05 PM
To: towert...@contesting.com
Subject: [TowerTalk] FOUND THE NOISE PROBLEM
Gene mentioned the ouside light. The light is a motion sensor type. When I
turned the inside switch off the noise disappeared. YAAAY!! Thanks to
everyone who helped me on this one. You guys are A#1. now I need to go to
lowes and purchase a new non sensor type light. The sensor is great when
you walk up to the door at night but my SW dxing takes presidence. 73s
tony k2vi
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