31 Mar
1999
31 Mar
'99
12:50 p.m.
What were they? I assume one was the termination
switch.
Well, I'm home now and I realize that I was using a Panasonic
TR-120, not my Amdek (I wonder where that's buried?). The
only switch that makes a difference is labled:
Hi-Z
75 <ohm symbol>
It looks good in the "Hi-Z" position although I can now see
that if I turn up the brightness and contrast all the way I can
just make out the display in the 75ohm position. I've just
spent a couple of minutes fooling with the pot shaft sticking
out of the back panel and, sure enough, it makes a difference
in the behavior of the color regions that the color test program
displays. I'll try it on my "good" TV in a little while.
31 Mar
31 Mar
1:32 p.m.
75 (ohm)... <SNIP>
I believe that's just an attenation control; puts a 75 ohm resistor before
the monitor.. Like the Pad control on a sound mixer I think, just brings
the level down to avoid damaging things... or something ;P
Kevin
--------------------------------------------------------------------------------
After sifting through the overwritten remaining blocks of Luke's
home directory, Luke and PDP-1 sped away from /u/lars, across the surface
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-- DECWARS
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| KC8BLL ----------| Wrapped in a mystery -Milford High School |
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1 Apr
1 Apr
2:29 a.m.
For anybody that's keeping score...
C4P display options:
1) Panasonic TR-120 mono composite monitor - good mono display
2) Cheap Sears brand 13" color TV, video in - no good, fuzzy patches where
characters should be
3) Hauppauge video capture card, NTSC in - no good, looks same as #2
4) Toshiba 27" color TV - works fine, nice picture after a little
adjustment to the TV and whatever that pot on the back of the
C4 is
#3 is very disapointing becuase I was going to capture screens to put
on an eventual OSI web site. Would running the signal through an RF
modulator to the antenna in on #2 and #3 possibly correct the problems?
6:44 a.m.
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7:43 a.m.
Athough I used my OSI with a cheap television with a tap at the video
input I found the best most crisp display was on a tiny 9" Panasasonic
video monitor... Most of the sharpness was due to the smaller display but
it sure looked good at the time.
George
=========================================================
George L. Rachor Jr. george(a)racsys.rt.rain.com
Beaverton, Oregon http://racsys.rt.rain.com
United States of America Amateur Radio : KD7DCX
On Thu, 1 Apr 1999, Tony Duell wrote:
Not really. It's the termination switch. It connects a 75 Ohm resistor
across the video input socket (from the signal to ground if you like) to
terminate the video input cable (like terminating a SCSI bus, basically).
In theory, the video output on the computer should be designed to drive a
75 Ohm load. You then terminate the last (or only) monitor. If you don't,
you might get reflections on the cable and ghosting on the picture.
But it appears that OSI products are designed to drive a high-impedance
monitor only. I guess on short video cables you still get a reasonable
picture.
-tony
75 (ohm)... <SNIP>
I believe that's just an attenation control; puts a 75 ohm resistor before
the monitor.. Like the Pad control on a sound mixer I think, just brings
the level down to avoid damaging things... or something ;P
6:41 a.m.
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9442
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5 comments
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a2k＠one.net -
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