🚀 go-pugleaf

Mike Coughlin (mikc@gnu.ai.mit.edu) wrote:
: In article <5u15eh$q4e@janis.virago.org.au>,
: Rachel Polanskis <r.polanskis@nepean.uws.edu.au,grove@zeta.org.au> wrote:
: 
: >I have heard that monitors for distribution in the Northern Hemisphere
: >are different to monitors in the Southern Hemisphere.
: 
:     The monitors are exactly the same. They are only adjusted
: differently.
: 
:     The electron beam which creates the display in the tube must
: be exactly adjusted so all three colors (red, green and blue) are 
: the same size and in the same position all over the screen. The 
: earth's magnetic field effects this. The direction of the field
: is opposite in the Northern and Southern hemispheres. So a color
: monitor adjusted properly in the United States will be out of
: adjustment in Australia. 

This doesn't make sense.  The same difference in magnetic field will 
result from turning a monitor with the screen facing north to the screen 
facing south (or east to west) in the same geographic location.  

There may be some differences for a 50 to 60 Hz. power supply, or line 
voltage, although modern switchers can handle this either automagically 
or with a slide switch for voltage.  

After shipping a monitor any distance, or changing its orientation in the 
room, you'll probably want to converge it.  Degaussing is usually done 
automatically on power-on or with a pushbutton. 

I've got a couple of Sony GDM-1950s, and have found that there are slight 
errors in dynamic convergence when the position of the monitor is rotated 
180^, which can be easily adjusted out by reconverging.  

Best to leave it in the place or at least the direction where it will be 
used, turn it on and let it run for an hour first, and keep power cords 
and the like as far away as possible, although the Sonys are pretty well 
shielded.

: >Are Sun (Sony trinitron) 
: >monitors effected by this?  I'd like to get one from the US 
: >since they are so much cheaper than over here in Australia, even after 
: >freight, and I would not like to import it only to find 
: >it is unusable.  

Just make sure that whatever monitor you buy is capable of running on 
your line voltage and frequency.  You'll probably have to buy a different 
power cord or plug. 

-- 
--                   Jay Hennigan     jay@west.net              --  
WestNet:  Internet service to Santa Barbara, Ventura and the world.
          805-892-2133   805-289-1000   805-578-2121