QSP-421SS: Instructions for basic operation and installation
Page
7
Some VCRs (in certain modes) and cameras will fail to generate correct field information that can be decoded by
the QSP-421SS. A camera or VCR of this type may cause the Quad picture to jump up and down by one line or
generate intermittent picture refreshing. In VCR recording and playback, the field decoding problem can cause line
reversals and “motion artifacts” when playing back a recording of a 525 line frame (625 for CCIR).
Most time-lapse VCRs on the market are “field recorders” and if frame recording is desired (for better line
resolution), the recommendation is to use “real-time” 24 hour recorders where the tape is always in motion.
Motion artifacts can be eliminated by the use of shuttered cameras with a shutter speed set to 30 frames per
second (25 frames per second for CCIR). Non-real-time VCRs should use field mode recording which is the
factory default setting.
F
IELD
M
ODE
(SW9:Position #2 = OFF)
This switch option sets the unit to display on its output only one field of video which is repeated twice per frame.
This same field is used during playback for both full screen and quadrant zoom. In a few cases when the VCR is in
playback but “paused”, the picture will jump (vibrate) by one line. Setting SW9:Position #1 to ON usually
compensates for this. For most other cases SW9:Position #1 should be OFF.
F
RAME
M
ODE
(SW9:P
OSITION
#2 = ON)
In frame mode each independent field which makes up a frame will get displayed for monitoring or recording. In a
system without a VCR, frame is the recommended mode of operation since it has twice the line resolution as field
mode. When used with a VCR, field mode is recommended. During VCR playback, most VCR’s will generate
intermittent field information in non-linear time lapse mode. Some VCRs tend to play back more odd fields than
even and other VCRs tend to playback more even fields than odd. SW9: position 1 should be set to whatever
position works best for that particular VCR.
S
PECIFICATIONS
P
HYSICAL
Dimensions:
H: 1-7/8”
x W: 8-1/2”
x D: 5-7/8”
H: 48 mm x W: 216 mm x D: 150 mm
Weight:
3.125 lbs./1.42 Kg. (main unit)
1.25 lbs./0.80 Kg. (power supply)
Operating Temp:
32
F - 104
(0
- 40
C)
V
IDEO
Signal Format:
EIA/CCIR compatible monochrome
EIA: 525 lines, 60 Fields / sec.
CCIR: 625 lines, 50 Fields / sec.
Camera Inputs:
0.6 to 1.2V p-p, 75 ohm termination
Camera Sync:
No special sync required
Monitor Output:
1.0V p-p into 75 Ohm termination
VCR Output:
1.0V p-p into 75 Ohm termination
Digital Memory:
512 x 512 with 256 gray scale level EIA
1024 x 512 with 256 gray scale level CCIR
