> 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
> some sources with cell phone chargers, computer routers, laptop chargers
> 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
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