OK, maybe the bet was a bit one sided, as most SM PSU's are made
in China and THEY produce EMI not the analogue ones.
How can the purchaser be responsible? They don't design and
manufacture the item !
EMC rules on these PSU's are very clear. If however, the
manufacturer chooses to omit vital EMI
Actually the purchaser does have the ability to decide on the importance
of the EMI signature. Many of the laptop products only have to stand up
to the A standard. Where as some companies have tougher requirements
and require things to stand up to a higher standard.
I work for a company that
VR2BrettGraham wrote:
G3RXQ asked F4FNT about the Dell OEM UPS (probably
meaning power supply) for his laptop that made noise
G4ILO then added:
Actually it was Stewart G3RXQ who asked if the PSU was made in China.
I don't have anything against products made in China. Just about
It makes no RFI at all that bothers you in your situation. The only
product that produces no RFI at all is the pet rock. Its all just a
matter of degree.
On Mon, 2008-03-17 at 02:37 -0700, G4ILO wrote:
It is a very high quality product and creates no RFI at
all.
You can't float the laptop power supply. The neutral
pin of the plug is connected to the supply ground
point as well as the ground pin. There is no ground
point on a plastic lap top for the station ground.
The only way to float the computer is to unplug the
charger, which did work, but only
Brett Howard wrote:
California is now
outlawing the use of unregulated transformer based linear supplies in
new products.
Oh, great.
Although as you point out it is possible to make a quiet switcher, it's
also cheaper to make one that will wipe out everything for a 100-yard
radius. Let
The only product that produces no RFI at all is the pet rock.
Even rock has a radiation signature..
BTW - If you are worried about radiation, don't do a walking tour of
Edinburgh, Scotland... Granite is 'radio' active
--
Dave G. KK7SS
'65 MK III Sprite in Richland, WA
Two things are infinite,
: [Elecraft] [K2] : Laptop UPS
Brett Howard wrote:
California is now
outlawing the use of unregulated transformer based linear supplies in
new products.
Oh, great.
Although as you point out it is possible to make a quiet switcher, it's
also cheaper to make one that will wipe out everything
The only product that produces no RFI at all is the pet rock.
Even rock has a radiation signature..
BTW - If you are worried about radiation, don't do a walking tour of
Edinburgh, Scotland... Granite is 'radio' active
Noted! ;)
___
Elecraft mailing
Brett Howard wrote:
But yes California heard about this and was like
wow if we get rid of all those passive loads from bricks that are plugged
into products that are turned off we'll save all sorts of money.
Can they spell hot standby? Cold starts are not good for a lot of
electronics, to
Hi Elecrafters,
I am interested to know what solution can be used to avoid the noise
generated by the 220 V AC (OEM) UPS of my recent Dell Latitude Laptop.
For the time being, I can only use the laptop with my K2/100 if the laptop
is powered by its internal battery.
Raymond METZGER
F4FNT
By any chance was the UPS manufactured in China ?
73
Stewart G3RXQ
On Sun, 16 Mar 2008 09:05:37 +0100, Raymond METZGER wrote:
Hi Elecrafters,
I am interested to know what solution can be used to avoid the
noise
generated by the 220 V AC (OEM) UPS of my recent Dell Latitude
Laptop.
For the
I don't know if it applies to your situation or not
Raymond, but I had a lot of hum on when I connected my
110V Lap top to my TS-850 for PSK-31. I had the
charger plugged into a house circuit and my radio
equipment plugged into a separate circuit for the
radio station. When I moved the charger
Bob N6WG
- Original Message -
From: Raymond METZGER [EMAIL PROTECTED]
To: Elecraft@mailman.qth.net
Sent: Sunday, March 16, 2008 12:05 AM
Subject: [Elecraft] [K2] : Laptop UPS
Hi Elecrafters,
I am interested to know what solution can be used to avoid the noise
generated by the 220 V
Stewart Baker wrote:
By any chance was the UPS manufactured in China ?
That's not a very fair bet; almost every bit of consumer electronics is
manufactured in China or has most of its components manufactured there.
However, if the suggestion is the responsibility for poor EMC lies in
; Elecraft@mailman.qth.net
Objet : Re: [Elecraft] [K2] : Laptop UPS
By any chance was the UPS manufactured in China ?
73
Stewart G3RXQ
On Sun, 16 Mar 2008 09:05:37 +0100, Raymond METZGER wrote:
I am interested to know what solution can be used to avoid the
noise generated by the 220 V AC (OEM) UPS
Well I didn't plug it into my K3 with the transformer
isolation because my K3 is in its gestation period and
I am waiting for delivery. But, I don't think that it
would have avoided the problem. I was using
transformer isolation with a Rascal Interface. The
hum came through the push to talk
G3RXQ asked F4FNT about the Dell OEM UPS (probably
meaning power supply) for his laptop that made noise
G4ILO then added:
By any chance was the UPS manufactured in China ?
That's not a very fair bet; almost every bit of consumer electronics is
manufactured in China or has most of its
18 matches
Mail list logo
