Hi Jim,
Respectfully, in every case here but one, (and I have been involved in
maybe 10 to 15 in the past three years), the RFI from grow ops were
unheard on the AM band with a local station tuned in, and while in front
of the offending grow op.
I am sure that in some cases it is hearable on an AM channel, but so far
here, (and I have expressly, checked at each location), I have had very
little luck with this. It is one of the first things I check for, so I
can involve the CE of the AM station being affected...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 12/15/19 11:26 AM, Jim Brown wrote:
On 12/15/2019 6:40 AM, Dave Cole wrote:
The problem with that approach is that most AM stations are strong
enough to override RFI, in most locations, on the AM broadcast band.
That's not even close to being true. More than 30 years ago, a colleague
who was Chief Engineer at WLS, a 50kW clear channel station licensed to
Chicago with a transmitter site SW of the city center, found that his
station could not be heard through the noise in Ford vehicles in the
northern parts of the city. Noise conditions are FAR worse today.
Growing up in WV in the '50s, our NBC radio affiliate was WLW, a 50kW
clear channel station on 700 kHz, 125 miles away.
73, Jim K9YC
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