Description

 

BH-20H Harmonic Drive Equatorial Mount Portable Design/Extra Large Load Ratio/Upgraded Version of BH-17H

Features:
- Ultra-portable size: The size of folded body is only 228*177*134mm; its side projection area is less than 53% of that of A4 printing paper
- Large load-to-load ratio: self-weight 5kg; hammerless load 22kg; RA shaft adopts 20-type 160 harmonic, which improves torsional rigidity by 80%, compared with BH-17H; can meet the load requirements of 10-12-inch reflective star camera system
- Motor direct drive: Directly driven by high-resolution stepper motor + high subdivision driver, the guide star response has no transmission time lag; it ensures no backlash and completely avoids errors caused by the transmission structure; no aging or tearing caused by thermal expansion and contraction of the synchronous belt
- Strong power: RA axis adopts 57 type high-power stepper motor to ensure accurate and stable step distance in any direction; with no backlash harmonics, featuring excellent wind resistance
- Hammer-free leveling: 71mm ultra-short RA wheelbase, and a large gear ratio harmonic load center of gravity 22cm from the RA axis, 22kg within 15cm of the DEC axis, safe for deep space photography
- Modular design: The controller is newly upgraded V2.0 to optimize stability. The controller is separated from the equatorial mount body, which is flexible to upgrade and easy to maintain; the bottom interface is compatible with a variety of tripods, including photography tripods; the body reserves an electronic polar scope/laser interface
- Cost-effective: This equatorial mount focuses on tracking and searching for guide stars, creating a model of high cost-effectiveness
- Self-locking after power failure: it is safe and worry-free to lock motor in 0.2 seconds. This harmonic equatorial mount adopts patented stall lock design, no longer let accidental power outage threaten the safety of your equipment
- Multi-platform access: Adopt open-source ONSTEP control system, fully support all kinds of guide and star map software; support handle, computer, WIFI hotspot, APP, Bluetooth and other access methods; support for PHD MDL THESKYX MetaGuide NINA SGP and other professional software; Support for ASIAir, ASCOM, INDI and other star map platforms
- High-precision harmonic: The RA shaft adopts the industry leader Leaderdrive's high-precision harmonic reducer; its unique tooth shape still has a long service life under high torque. And after astronomical training, the inherent periodic error is reduced, and the tracking process is more stable and smooth
- Its main control board can permanently save the time coordinates, and there is no need to reset it after booting; and it can memorize four sets of locations for quick switching
- Multi-latitude mode switching: latitude and longitude mode 90°; mid-latitude mode 20-55°; low-latitude mode 0-30°
- Ultra-small size; ultra-light and automatic
- The front cover has reserved interface for easy installation of electronic polar scope
- RA axis 20-160 harmonic deceleration; DEC axis 17-100 harmonic deceleration
- Compatible with a variety of column tripod installation; tripod adapter can be customized
- The whole hollowed out 6 series aging treatment; high-strength aluminum alloy body
- Free weight levelling

Specifications:
- Drive form: motor direct drive harmonic
- Front stage transmission error: none
- Weight: 5.0kg
- Hammerless load: 22kg or 47Nm
- Load with hammer: 30kg (3kg counterweight at 30cm from RA axis)
- RA axle wheelbase: 71mm
- RA axis motor: 57 stepper motor
- RA Axis Harmonics: 20-160 Standard Edition
- DEC axle wheelbase: 101.5mm
- DEC axis motor: 35 stepper motor
- DEC Axis Harmonics: 17-100 Standard Edition
- Maximum goto speed: 3.5°/s 840X
- Control system: Onstep external
- Latitude adjustment: 0~55°
- Heavy hammer seat: standard
- Theodolite mode: handle replacement
- Power off anti-dump: stall lock
- Handle: Integrated hand control box V2
- Guide accuracy: 0.6~1.1
- PE: about ±20"
- PE cycle: about 270s
- Dovetail groove: 60° 74 wide
- 20~55°Elevation angle single-turn adjustment: 0.91°~0.97°
- 0~30°Elevation angle single-turn adjustment: 0.9°~1.25°
- Bluetooth: Support Bluetooth 4.2
- WIFI: Support (Max 20M)
- USB: standard USB2.0 type A drive-free direct connection
- ASCOM: Support
- IND: support
- ZWOAIR: Support
- Multi-star calibration: support
- Auxiliary epipolar axis: support
- Star Gallery: Comes with 20000+, with star catalogue including M, NGC, and IC
- Power supply: DC12~24V at least 2A

Package Included:
- 1 x Equatorial Mount