Eddie,
I'm curious if you measured the "noise pulses" with a quasi-peak receiver
or spectrum analyzer. That is what the FCC specifies for Part 15 devices at
HF. The QP detector has a fast-attack, slow-decay response (1ms and 1 sec
time constants, respectively, if I recall correctly). It's intended to
represent the perceived severity of low duty cycle interference sources.
I have seen more than 30dB difference between the QP detector and average
signal levels. That often happens when a rectifier produces short,
high-amplitude transients at every AC line half-cycle.
73,
--Tim (KR0U)
At 12:00 PM 10/25/04 -0400, you wrote:
>There were noise pulses there that were about 40-60db above the noise
>floor, but they were very thin across the band so they didn't cause
>much interference.
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