[Elecraft] Computer Monitor Recommendations

[John K9UWA]

THANK YOU K9YC Jim

I have read all the monitor solutions offered since the OP posted his question 
yesterday. 
#1 I never met a monitor yet that didn't emit RFI and at least 90% of the noise was 
from the no surprise here Switching Power Supply. That said I purchase two LG  
LCD monitors 2 years ago that have EXTERNAL WALL WART supplies. No I 
didn't want to go inside a brand new monitor to try curing the SMPS noise. I can 
replace a Wall Wart 19 volts 2 amps. Nice Lambda regulated power supply. I 
think it weighs around 20 pounds. I added #31 mix cores to the AC cord on the 
Lambda supply plus #31 mix cores on the 19v to each Monitor. 

The Test?  Transistor scanning radio that scans from LW up through VHF. While 
listening to the monitor and yes I can hear it a couple inches from the LCD screen 
but no farther than that. And Zero RF noise when listening to the DC line to the 
monitors or the AC line to the Lambda 0 to 20v supply. 
73
John k9uwa


> > No EMI that I can
> > detect by on-off testing (there's plenty from other nearby sources).

> 
> Did you unplug the  wall wart (or the monitor) from the wall? That PSU, 
> whether external or built into the monitor, usually a major noise source.
> 
> ALWAYS, when offering (or evaluating) advice about whether some device 
> is noisy, consider the possibility that the noise it produces is covered 
> by noise from other sources in your home and in your neighbors's homes. 
> Also consider proximity to ANTENNAS, not to the shack.
> 
> I work a lot of FT8 on 160M to work DX and on 6M to work new grids. The 
> signal report is the signal to noise ratio. I run legal limit to very 
> good antennas on both bands, and I regularly receive reports that are at 
> least 10 dB worse than I give, telling me that most hams have horrendous 
> noise levels.
> 
> 73, Jim K9YC
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John Goller, K9UWA & Jean Goller, N9PXF 
Antique Radio Restorations
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