Using the WAT- 910HX/RC for timing occultations



Updated 2014 August
Last updated: 2015 July

WATEC 910HX user manual (click to download a pdf copy)

The WAT-910HX/RC was bought from Modern Astronomy in March 2014
The picture (right) shows how I supported the remote control cable which has a white plug and 6 coloured wires. These wires can become detached or broken.

Here I use cable ties on a BNC connector so that accidental pulling doesn't break any connections. The bolt and washer was a first attempt. The bolt is now a camera orientation marker.

The availability of new120N+ stopped in 2012, and a more sensitive camera became available late 2013. This camera is the WAT-910HX (above) with 6.4x4.8mm - Type 1/2" CCD. The 910 didn't include a power supply or 1.25" nose piece. The nose piece is C mount to 1.25"

2025: I now use a Li-gel 12v power pack for mobile observing.

A 30cm F/4 Orion Optics (UK) Newtonian and WAT910HX camera serial number 01106, detects a 16 mag star at x64 (1.28 sec).

Variants of the WAT 910:
1) 910BD is the board camera, with no housing or power supply. It can be controlled by computer if you have the DIY the code.
2) removed

3) 910HX/RC new chip version (more sensitive) with serial number 1001 onwards and with cable remote control. (This camera)

Review by Hristo Pavlov at the 2013 IOTA meeting http://www.youtube.com/watch?v=DP8d58DJRqQ

The 910HX/RC (Remote Control box) has On Screen Controls (OSC). There are only two controls needed to adjust on the 910HX (shutter and gain), and after a few button pushes it becomes easy the dark.



Operation

For occultations, we suggest starting with x8 (0.16s) or x16 setting (0.32sec) with a gain 40db if the sky is dark, otherwise use 38dB or less if the sky is bright.

Exposure> SHUTTER = 8/50s, Exposure>GAIN = 40dB

Turn settings OFF

Most (indeed all) advanced setting should be turned off for occultation video. These are:
SENS UP: auto exposure OFF
AGC: auto gain OFF
SHARPNESS = 0 [ default is 4 ]
3DNR : Dynamic noise reduction OFF

Note: if RESET is used, the default settings should be re-set to the above.

Settings for Occultations are:
SHUTTER = x2 to x256, EI*, 1/50th. [1/250th and shorter if the object is very bright. Frame rate is still 1/25th ]

Manual GAIN: 37 to 42 (when dark)
GAMMA: Set to 1. There is a user gamma control. This can be adjusted for individual setups and cameras to fine-tune the image. Normally should not be needed.

FUNCTIONS> IMAGE REVERSAL is a useful function if you are using right-angled viewers.
Dark Frame subtraction is also possible (on the fly).

BLEMISH (BLC) removal function: This is a "dark frame" in effect. An old camera will have hot pixels: Suggest use x8 FRM, and LEVEL 4 (See instruction manual)

BLACK POINT: There is no blackpoint correction in the WAT 910HX/RC manual. Suggest use of Gamma control if required.

 

* NOTE:
For focusing on the Moon (for lunar Occultations) use EI, and then change to 1/50th. or x2 for timing.
For Asteroid Occultations, use x2 (0.04), x4 (0.08), x8 (0.16), x16 (0.32). Longer exposure will be needed for faint object or smaller telescope aperture.