[RFI] Noise Measurements

Jim Kennedy kennedyjp at cableone.net
Thu Nov 13 12:34:11 EST 2014

FWIW. I use a "ham it up" down converter 
http://www.nooelec.com/store/ham-it-up.html  along with a cheap dongle out 
of China and the appropriate DF antenna. SDR sharp software is used. Pretty 
much gives me DC to daylight coverage. Combined with a small laptop and of 
course adequate shielding of the electronics its been a very effective 
method of finding local noise sources from HF up into the Ghz region.


-----Original Message----- 
From: Jim Brown
Sent: Thursday, November 13, 2014 16:50
To: rfi at contesting.com
Subject: Re: [RFI] Noise Measurements

On Thu,11/13/2014 6:21 AM, mstangelo at comcast.net wrote:
> I am looking at using the ELAD FDM-S2 as a RFI receiver.

The computer interface possibilities for documentation and the spectrum
display are most useful for chasing electronic sources (switching power
supplies, microprocessors, motor controllers, etc.).

For non-electronic sources that are impulse noise (power lines, neon
signs) a receiver that goes higher in frequency will help zero in on the
source. For that, a VHF/UHF ham transceiver with broadband RX and AM
detection would likely be more useful. Two that fit the bill are the
venerable TH-F6A and the TM-V71, both Kenwood products, both computer
programmable for setup, both with AM capability to the top of their
tuning range. Combined with a compact 440 MHz Yagi, a rig like this
would make a very good impulse noise chasing setup.

To chase impulse noise, I have AM mode on frequencies in the range of
500 MHz, as well as in the range of 160 and 300 MHz programmed into both
radios. As I drive around, I mostly monitor the 160 MHz frequency, then
shift to 500 MHz when the signal gets very strong to zero in on the sources.

73, Jim K9YC

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