On 5/26/2019 12:15 PM, Jim KO5V wrote:
I have a ~24" LCD monitor that I want to use for logging, to display my panadapter, etc. Unfortunately, it is very noisy on HF.
This is a very common problem. There are (at least) two heads to the snake. The most common, and easiest to fix, is the power supply if it is a wall wart. Wind multiple turns of the power cable through a #31 Fair-Rite core. The other head of the snake is noise from within the monitor itself, which radiates directly from it's own wiring and from the video cable. No fix for what radiates from it's own wiring, but multiple turns of the video cable around a #31 Fair-Rite core will kill that part of the noise.
Another very good solution to the power supply component of the problem is to replace the noisy power supply with a quiet one -- namely, a vintage linear supply with a transformer, rectifier, and filter.
There's a lot more detailed advice on this on my website. http://k9yc.com/KillingReceiveNoise.pdf http://k9yc.com/KillingRXNoiseVisalia.pdf 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
