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IOTA-VTI Operation Manual
If you see the LED illuminate within one field of UTC change, then your camera
sends video as it happens. If the LED illuminates two fields or more after UTC change, then
the camera is an accumulating camera. YOU NEED TO KNOW how many fields the
camera accumulates before sending the image.
NMEA sentence output:-
It is possible to listen in to the NMEA-GGA
sentences from the GPS. This will require use of the
USB Dongle, which in turn requires installation of
FTDI drivers and software like HyperTerminal or
similar.
Dark Frame:-
On the IOTA-VTI's Rear Panel, a switch marked Dark can be found. This is to allow dark
frames to be made, for subtraction of darks from the recordings. Pressing the switch simply
nulls the OSD and can only be activated while switched to the Position Screen. The dark
switch will not work while the Time screen is activated.
Conclusion:-
IOTA-VTI will provide you with good, accurate timestamps if you take the time to set
your system up beforehand, and measure your camera latency at the accumulation
settings you use on the night.
Clear skies!
Tony Barry and Dave Gault
Western Sydney Amateur Astronomy Group
Walter Morgan and Sandy Bumgarner - Video Timers
- 11 -
Video Timers
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