[Elecraft] RFI issues

[Fred Jensen]

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