That is definitely the best way to do it... I have an sdr-iq that I can plug
into a laptop to walk around the house with a short whip or sniffer coil to
find stuff. Being able to see a whole band is the quickest way to go.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
-----Original Message-----
From: Paul Christensen [mailto:w9ac@arrl.net]
Sent: Sunday, March 11, 2012 12:27
To: 'RFI Mailing List'
Subject: Re: [RFI] Receiver settings for hearing RFI?
> I plan on evaluating my house for HF noise sources by powering the
> radio from a battery and powering down the rest of the house. I just
> have to have some sources with cell phone chargers, computer routers,
> laptop chargers and such. Then I'll power up one breaker at a time.
That's a ritual I go through once a month. It goes much faster if you can
see the entire band on a panadapter. Since the display is RF-sampled, noise
is identified regardless of receive mode. I use an SDR-IQ receiver,
notebook PC, and tunable loop antenna. The netbook's battery is the power
source for the SDR-IQ and active loop antenna.
Without that kind of setup, sharp impulse noise is probably best detected by
ear when using wideband AM mode. The junk usually emitted within the home
from switch-mode sources generally repeats itself every 30kHz-100 kHz,
depending on the appliance's switching frequency. Once you've identified
the hallmark signature of one switching source, it becomes easier to find
others.
Paul, W9AC
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