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

[Ignacy Misztal]

Very smart move with the SDR. Seems low noise and 14V are big assets. Is
Samsung sensitivity to RF extending to antennas 100 ft away?

New PCs including NUC support USB-C monitors where monitor chain linking is
supported and the monitor can power the PC. SO the number of cables can be
reduced. I bought a Dell USB-C monitor. It has a wonderful resolution and
colors but is RF rich. Torrids do not seem to help much.

I am wondering if any Samsung or LG with USB-C is RF quiet. Out of USB-C
monitors, BestBuy lists LG 27' Ergo for $460.

Ignacy NO9E

On Wed, Feb 23, 2022 at 12:16 AM Artek Manuals <Manuals at artekmanuals.com>
wrote:

> 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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