[RFI] Noise Measurements

Jim Brown jim at audiosystemsgroup.com
Thu Nov 13 11:50:24 EST 2014

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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