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
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Dave Manuals@ArtekManuals.com www.ArtekManuals.com
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