Jim KO5V
I have a similar problematic LCD monitor. Mine is 27” by Nixeus - the least expensive 27 inch monitor I could find. Two kinds of problems include broadband noise of about 2 to 3 dB across 20 meters and a specific frequency noise of about 3 kHz wide at about 14.250 MHz. Like yours, the noise goes away when it goes to sleep.
Like you, ferrite additions have not worked. I have 2 1/2 inch ferrite cores through which I wrapped the power and signal cables.
My solution? Turn off the monitor. It is a second monitor, paired to my iMac 27 inches which has no such noise. A future, more expensive solution will be to get a new, better-hopefully monitor.
Not the answer you want to hear, but I feel your pain.
73
Hoop
K9QJS
On May 26, 2019, at 12:15 PM, Jim KO5V <
[hidden email]> wrote:
Good afternoon,
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. When It goes to sleep, the noise goes away. This is even more irritating because I now have the K2/computer/logging, etc, all working together. I've searched a bit on-line, but so far, I have not found any real solutions (but a lot of "me too" answers, and one suggestion to ditch the radio and make use of the internet...).
There are what look to be ferrite beads on each end of the signal cable from the computer to the monitor, and on the monitor end of the power supply's low-voltage line (I assume it's a switching supply). There are no beads on the supply's power cord.
All the radio equipment and the computer are using the same AC circuit. The rig and amp are grounded to the station ground, but the computer and monitor are only grounded through the AC supply.
I have four clip-on ferrite beads that I've tried on each end of the monitor's two lines, and they make no difference.
Does anyone have any suggestions? Maybe I've missed something dumb. I don't mind getting some big cores if necessary, but I would like to hear of someone's success before spending a lot of money trying to "shotgun" the solution, and I really don't want to get a new monitor - but if anyone has a suggestion of a noise-free one, please let me know.
Thanks in advance. 73,
Jim KO5V
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