I wouldn't spend a lot of time trying to locate the source in my neighborhood
until I had hit the main breaker in my house. It is just much easier to do
that, even with a minor inconvenience, than it is to go souting the
neighborhood.
The most important question is not "what is it," but "where is it?" If someone
said it was a Sheetzu model 188 fly catcher, would that be of much help trying
to find it? And many noisy devices can sound the same, or sound like a verbal
description, so if someone's guess is wrong, you will spend a lot of time
looking for a device instead of finding where it is.
When you do get around to scouting the neighborhood, bring a handheld receiver
with an S meter. Start by going to every transformer on every pole and putting
the receiver about 2 feet from the ground wire that will be present on every
pole with a transformer. It is very likely that the noise will be at least one
S unit stronger on the pole connected to the source premise.
Then
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Jim Brown
Sent: Monday, September 01, 2014 2:28 PM
To: Hugh Valentine
Cc: Rfi List
Subject: Re: [RFI] Noise on 3513.5
Hi Val,
I've seen reports from others, and it was on my list to listen here. I just
did, both on my TX antennas and the Beverages, at about 11 am local time. I see
noise bumps from one or more switching power supplies on the
P3 spectrum display, but hear no birdies. Then I tuned my trusty TH-F6A to 3515
LSB and poked around the only Ethernet gear in my home and the CATV cable.
Nothing heard. Those were my first guesses, and came up negative.
My suggestion for chasing this is to do what I did, perhaps driving/walking
around with a mobile or handheld battery operated rig looking for it. The
TH-F6A has very poor sensitivity on HF, so you must be right by the source to
hear it. A better RX would be one of the excellent Tecsun receivers. I own a
PL380 (the smallest) and a PL660 (bigger, 3-6 dB more sensitivity, has a BFO).
QST just gave a glowing review to the PL880. In addition to their virtues as SW
RX, they are excellent on the FM broadcast band, and the larger ones (660, 880)
are quite good on the AM broadcast band.
73, Jim K9YC
On Mon,9/1/2014 10:49 AM, Hugh Valentine wrote:
> Jim,
> I have a varying, warbling, rough tone on 3513.5 CW with K3 running
> on 12VDC battery, only rear connection is external antenna...using
> K9YC 7T 5 Core Choke....All other stuff turned off/unplugged in
> shack...Computer, Pwr Supplies, Modem, router, Fluorescents, etc.
> I have a VHF "sniffer" that is quiet and does not show any source.
> I have yet to Turn off the Mains...waiting for XYL to go out of Town
> next week to try that.
> Any thoughts as to the source?
> Val
> N4RJ
>
>
> ____________________________________________________________
> *The #1 Worst Carb Ever?*
> Click to Learn #1 Carb that Kills Your Blood Sugar (Don't Eat This!)
> <http://thirdpartyoffers.juno.com/TGL3142/5404b200edabb320065a0st01vuc
> >FixYourBloodSugar.com
> <http://thirdpartyoffers.juno.com/TGL3142/5404b200edabb320065a0st01vuc
> >
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|