[TowerTalk] FOLLOW UP & SOLUTION ..RE Quiet 27" monitors ?????/

[Artek Manuals]

In the end I took my small portable SDR receiver down to WorstBuy, and a 
couple of office supply places with computer equipment and used the SDR 
to "SNIFF" the monitors on display. In the end the 27" Samsung's ( Flat 
screen and curved alike) ALL models were consistently "quiet" !!!!!!! 8^)

ASUS was 2nd with only a few spurs The HP's and Dell's were by and far 
the worst . they looked like a forest full of pine trees on the SDR 
spectrum display...8^(. I did not get a chance to measure any LG's

One of the other benefits of the Samsung's is that the all use use 14V 
switching power supplies . Subsequently I found they run just fine of 
the main 13.8V Linear (Astron) station supply.. So no Switchmode noise 
generators ( which is consistent with my war on switching supplies in 
the shack and house where  ALL the switchers have been replaced with 
linear supplies). The Samsung power jack is not your standard 2.1/2.5 mm 
job so I just cut the cord off the switcher and put lugs on the wires 
and bolted them into the station 13.8 stack. A final stake in HP's 
heart, the HP's are 19V units.

Dave

NR1DX




On 2/15/2022 9:06 AM, Artek Manuals wrote:
> My apology in advance  if this is not a proper topic for this forum. 
> please point somewhere more appropriate.
>
> I recently redid my station operating position layout and upgraded to 
> two 27" inch LED monitors
>
> Much to my dismay so far 3 different manufacturers of 27" monitors  
> all had significant spurs or birdies . ( Dell, Acer and HP) . 
> Particularly on 14-28 MHz . I Keep taking em back to WorstBuy and 
> trying something else. My older ASUS 23" from 7 years ago were deadly 
> quiet. These are definitely video related not power supply hash. I can 
> change their frequency by changing the refresh rates in windows setup 
> . While torroids in the leads "helps" it is far from eliminating it.I 
> have tried many different torroid  mixes and i am still far from 
> eliminating it
>
> So my  question  can any one recommend a recent 27" led monitor 
> purchase that is is spur free? Make & model number please
>
> Dave
>
> NR1DX
>
-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com

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