[Elecraft] RFI issues

[Victor Rosenthal 4X6GP]

Not so fast. The K3's T/R switch can be overwhelmed by very strong 
signals. The result is intermod junk all over the bands. This happened 
to me with a 50 kW AM BC signal at about 1000 kHz that is line-of-sight 
to my antenna. I don't see why a super-strong VHF signal couldn't have 
the same effect.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 20-Feb-2020 20:10, Fred Jensen wrote:
> 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