Andreas: The probability that your noise is due to the TV or FM station
is extremely low [like really zero]. Meadow Lakes CA is the "TV/FM
capital" for the southern Central Valley [Fresno], and my 2m HT goes
full bars about 2 miles from the complex on both FM and AM [aeronautical
band]. When at the repeater site next to a 300 KW digital TV station,
my comrade's HT won't break my squelch. It is just front end overload
from way out of band, there is no discernible noise.
The number of noise makers we normally see in urban/suburban areas is
almost countably infinite. In addition to the 24/7 constant hash from
SMPS, I have a variety of intermittant noise sources that come and go
with periods ranging from a few seconds [probably the A/C motor starting
at the gym behind us] to an hour or so. One is a sequence of
synchronized carriers on the waterfall about 7 kHz apart that last for a
few seconds and then burst into roman candles that fog up the WF and
then fade in 2 or 3 seconds. Neighbor 4 doors down the street just
installed rooftop solar which I can now see on the P3 on 160 and 80. [:=(
K9YC's RFI notes pretty much cover searching for and fixing RFI.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 2/20/2020 9:42 AM, Jim Brown wrote:
On 2/18/2020 4:38 PM, Andreas Wachter via Elecraft wrote:
Yes, I did run the K3 off of a battery and pulled the main AC
breaker. Didn’t make any difference. Thus my suspicion that the RFI
is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station)
which are within 1.6 miles and in direct line of sight.
Do you have neighbors? Did you pull their breakers at the same time?
Do you have a UPS? They continue to run without power, so both they
and any connected equipment can create noise.
Did you take the time to study the link I posted?
73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
