Re: RFI resistant Monitor

Posted by Jim Brown-10 on Apr 11, 2016; 6:12am
URL: http://elecraft.85.s1.nabble.com/RFI-resistant-Monitor-tp7616198p7616200.html

On Sun,4/10/2016 10:44 PM, KC6CNN wrote:
> I just found that when the monitor is on it adds 2 bars of noise to my
> meter. It is also turning off when I operate on certain bands.

I had exactly that experience with a Samsung that W4UAT gave me because
it did that in his shack too. It also makes RF noise. The good news is
that not all Samsung monitors are RFI dogs. I have two recent model
Samsungs in my house and four in the shack. They are designed to run on
power supplies labeled 14VDC, and the supply they sell you is a
switching power supply that makes RF noise. I throw those power supplies
away, cut the attached power cable and attach red/black PowePoles, and
run them from either the 12V battery system in my shack  or a small 12V
lead-acid cell that I float-charge from a linear 12V wall wart.

I also use ferrite common mode chokes on both the video cable that runs
to the computer and the power supply cable "just in case" some RF trash
is conducted to those cables, which the cables could radiate.

All that, and a lot more, is discussed in this "in progress" article for
the National Contest Journal.  k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]