SkyWalker-Servo's specifications |
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| Motors: |
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| • | High quality Swiss made DC servo motors. | ||
| • | Iron-less rotor design featuring high power density. Provides for small Servo Drive Unit design and very efficient battery powered operation. | ||
| • | Long-life metal brushes: not standard graphite brush (limited life) motors. | ||
| • | Extremely
smooth low speed "cog-less" performance. |
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| Gear
reduction: |
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| • | Custom-made gear reduction included in each Servo Drive Unit. | ||
| • | High precision (not commercial quality) components (e.g. gears/bearings/shafting). | ||
| • | All-metal
gears: no plastic gearing involved. |
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| Drive
electronics: |
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| • | High efficiency power MOSFET 4-quadrant (i.e. "push/pull") drive. | ||
| • | Full digital design featuring 32-bit servo control. | ||
| • | "Flash" re-programable firmware providing upgrades from Internet download. | ||
| • | Complete
protection against overload (avoids gear, motor and electronic damage).
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| Accuracy
and resolution: |
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| • | Servo
motor position is controlled to 0.09 arcsecond on G-11/HGM-200/GM-8/CI700.
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| Servo
Drive Unit enclosures: |
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| • | Fully-machined black anodized aluminum gearboxes and electronics enclosures. | ||
| • | Laser engraved graphics (i.e. connection and indicator labels). | ||
| • | One-piece design that directly attaches to G-11 with no additional adapter blocks or plates. | ||
| • | Designed
to be free from obstructing any Losmandy accessory such as encoder
gear covers, "spindle- type" clutch knobs or high-resolution
Losmandy encoder option. The Servo Drive Unit design protrudes into
the path of the mount's moving parts by no more than the original
Losmandy stepper motors. |
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| Power
supply |
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| • | 12v operation (11.0v to 14.2v allowed). | ||
| • | <300mA typical when tracking (with no optional accessories such as dew heaters, axial encoders, etc. attached). | ||
| • | 3A
maximum when slewing, typically much lower (load dependent). |
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| Slew
rate |
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| • | Maximum slew rate 8.0°/sec. | ||
| • | Maximum
recommended slew rate: 6.5°/sec for G-11/GM-8/CI700 and 5.0°/sec
on HGM-200. |
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| Axial
encoder inputs (MJ-45, used in System mode): |
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| • | Connects optional optical encoders for closed loop operation. | ||
| - | Supports standard quadrature-output encoders. | ||
| - | Supports Tangent Instruments™ pin-out and Astrometric Instrument's enhanced encoder pin-out (i.e. provides axial index input for alignment from indices). | ||
| • | Detects
up to 20,000 encoder quadrature transitions per second. |
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| Autoguider
inputs (MJ-12): |
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| • | Connects to an autoguider such as the SBIG ST-4. | ||
| • | The
autoguider corrects at the currently selected SkyWalker1 pan/correction
rate. |
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| HP1
handpaddle: |
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| • | Included with SkyWalker1 purchase | ||
| • | 14 ft (3m) coiled cord | ||
| • | Powered from SkyWalker1 | ||
| • | 3.60"
x 5.75" x 1.20" (92mm x 146mm x 31mm) excluding cord |
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| Built-in
peripheral support: |
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| • | Electric focuser port (3.5mm phono jack, for 9v focusers) providing variable speed drive (up to 250mA). | ||
| • |
Illuminated reticle port (3.5mm phono jack) providing variable output
(up to 24mA) for cable-driven LED illuminated reticle eyepieces. |
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| Size
(excluding connectors): |
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| • | Both
RA and Dec Servo Drive Units: 5.2" long x 2.9" wide x 2.3"
thick (132mm x 74mm x 58mm) |
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| Control
switches: |
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| • | Power | ||
| • | System/SkyWalker-mode
select |
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| Indicators:
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| • | Power | ||
| • | Programmable Mechanical Error Correction (PMEC) | ||
| • | Battery status | ||
| • | Operational
status (System/SkyWalker-mode and "Celestial Sync") |
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| Internal
Time-base Accuracy: |
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| • | +/-30ppm
from -20C to 50C ambient |
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| Environmental
Requirements: |
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| • | -20C to 50C ambient | ||
| • | 5%
- 95% relative humidity, non-condensing |
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|
Ports |
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| • | RA Drive Unit: | ||
| - | Power: 2.5mm power jack. | ||
| - | Communications: MJ12 (4 wire phone type) RS232. Provides connection to PC running SkyGuide Telescope Control System software. | ||
| - | Handpaddle: MJ45 (8 wire) HP1 and SkyGuide "smart handpaddle" compatible. | ||
| - | Axial Encoder: MJ12 (6 wire). Directly connects to Tangent instruments (including Losmandy and Celestron) digital setting circle encoders (cables included). | ||
| - | Connection
to Dec Drive Unit: DB9 (9 wire) shielded "high flex" connection.
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| • | Dec Drive Unit | ||
| - | Autoguider port: MJ12 (6 wire). SBIG compatible. | ||
| - | Focus port: 3.5mm Phono plug. Provides direct Handpaddle control of popular motorized focusers. | ||
| - | Reticle port: 3.5mm Phono plug. Provides adjustable power source for illuminated reticle eyepiece. Brightness and "blink" adjustments provided. | ||
| - | TCS port: MJ12 (6 wire). Provides for Telescope Control System (TCS) expansion to one or more accessory controllers. | ||
| - | Axial Encoder: MJ12 (6 wire: same as on RA) | ||
| - | Connection
to RA Drive Unit: DB9 (9 wire) shielded "high flex" connection. |
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| • | "Mis-pluggins" will not cause SkyWalker or peripheral damage. | ||
| Back
to SkyWalker-Servo Overview |
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