[TowerTalk] RFI Issues for W7PSK

[Andreas Hofmann]

I am not sure if you have fully ruled out your own house yet or not.   But this may help...

I ran into something similar and initially thought it was because of my newly installed power Smart meter.  Then, I slowly turned off different circuits in the house (while monitoring the noise floor on the HF bands), and found it was somewhere in the house.  Finally, it turned out it was a switching power supply for my cable TV modem.  Replaced that with a brick, and all is good.

Good luck,
Andreas, KU7T


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of David Thompson
Sent: Tuesday, November 13, 2012 12:36 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] RFI Issues for W7PSK

I have had a number of RFI instances and less than 50% are power line related.  So the question of what if they (the power company) find the problem is in a house or business is very possible.

Here is what I have found:
1.    Door bell buzzers.
2.    Bad switches in my power panel.
3.    Defective motors in fish tanks.
4.    A bad UPS at a software company
       1/2 mile away.
5.    A defective motor on the AC at the        same software company.
6.    Defective electric fences.
7.    TV sets that generate noise.
8.    Touch on lights (160 and 80).

Another problem for underground utilities is bad grounds and lightening strikes.  The problem usually stops between 7 and 10 Mhz.

Power Companies have full work loads already and at best they will have a CB sniffer.

Private homeowners and businesses do get FCC letters just as do the Public Utilities.  So its probably up to the ham to find the problem and ask for help.  The FCC is usually the second level of help.

Dave K4JRB
 


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