WarpAstron WarpDrive WD-20EP 

 High Precision Strain Wave Mount with RA Absolute Encoder (Mount Head Only)

Meet the mount that finally puts precision and power exactly where your imaging train needs them. The WD-20EP takes WarpAstron's acclaimed EC drive system and adds intelligent USB-C power delivery right at the saddle, so your camera and accessories get clean power without a cable jungle wrapped around your axes.

• True Axis Feedback, Not Just a Better Gear — a high-resolution absolute encoder sits at the RA axis output itself, measuring real position across the entire axis rather than estimating it from the motor, so what you see is what your sky actually gets
• Servo Direct Drive Precision — a dual-encoder servo direct-drive system on RA pairs an input encoder for instant correction with strain wave gearing for near-zero backlash, no belts, no aging, and nothing to adjust over time
• Seriously Low Periodic Error — rated at under ±3 arcsec (encoder corrected), a dramatic drop from the ±15 arcsec typical of strain-wave-gear-only designs, for a noticeably cleaner guiding signal
• Guide Smarter, Not Harder — lower periodic error means you can stretch guiding exposures from 1s up to 3s or more, ride out bad seeing without chasing every fluctuation, and even get serious about unguided imaging at shorter focal lengths
• Power Where You Actually Need It — dual USB-C outputs live right at the saddle (Port A: 5/9/12/15/20V PD3.1, up to 6A max; Port B: 5~20V PD3.1/PPS up to 3A, doubles as a mount PC connection), keeping cables short and your rig tidy
• Built to Handle the Field — machined from AL6061, stainless steel, and brass, weighing just 5.7kg while supporting 22kg unguided and up to 30kg with counterweights, all rated from -25°C to 45°C thanks to a belt-free design that shrugs off the cold
• Quiet, Confident Motion — BLDC servo motor direct drive means no gear whine and no stepper buzz, just smooth, near-silent tracking all night long
• Safety Baked In, Not Bolted On — hardware-level EC HA limits based on the RA absolute encoder plus Automatic Emergency Brake & Reverse, layered with software overhead, horizon, and meridian limits for genuine fail-safe protection
• Home In On Target, Every Time — RA absolute encoder homing paired with a DEC optical homing sensor gets you oriented fast and accurately, session after session
• Speaks Your Software's Language — runs on the OnStepX system with full ASCOM/INDI/LX200/INDIGO protocol support, connecting over USB Type-C for effortless PC integration
• Every Unit, Individually Verified — each mount ships with its own Axis PE Report, so the precision isn't just a spec sheet promise, it's measured and proven for your specific unit

Specifications

• Mount Type: Equatorial/Altazimuth
• Reduction Gear: RA 20 Strain Wave Reducer / DEC 17 Strain Wave Reducer
• Drive: RA Dual Encoder Servo Direct-drive / DEC Servo Direct-drive
• Output Encoder: High Resolution Absolute Encoder at RA axis output
• Motor: BLDC Servo Motor
• Weight: 5.7kg (12.5lb)
• Load Capacity: 50Nm standard / 60Nm max allowed — 22kg/44lb without counterweights, 30kg/66lb with counterweights
• Material: AL6061, Stainless Steel, Brass
• Brake: RA Axis (45Nm)
• Dovetail: Vixen & Losmandy
• Counterweight Shaft: M12 Shaft (1.75mm Pitch)
• Max Slew Rate: 10°/s
• Adjustment Range: ALT 0~90° (3-position coarse, 30° fine) / AZ ±8°
• Operating Temperature: -25°C ~ 45°C
• Periodic Error: ±3 arcsec (encoder corrected)
• Saddle Powering: Port A 5/9/12/15/20V PD3.1, 0~20V PPS, 6A max / Port B 5~20V PD3.1/PPS 3A max, also functions as Mount PC Connection
• System: OnStepX
• Safety Features: Hardware EC HA Limit (based on RA absolute encoder), AEB (Automatic Emergency Brake & Reverse); Software Overhead/Horizon Limits, Meridian Limits
• Protocol: ASCOM / INDI / LX200 / INDIGO
• Home Control: RA Absolute encoder / DEC Optical homing sensor
• PC Connection: USB Type-C
• Time/Location: GPS via Advanced Hand Controller
• Power Input: 12~25V, 5.5*2.5mm DC, 5A motion only / 10A with saddle powering
• Wireless: WiFi (AP/Station modes) / BLE via Advanced Hand Controller

What's in the Box?

• WarpAstron WD-20EP Mount Head
• DC Power Cable
• USB Type-C Cable
• Counterweight Shaft (M12, 1.75mm Pitch)
• Mounting and Dovetail Hardware
• Axis PE Report (unique to your unit)
• Quick Start Guide

Software and Docs

• OnStepX Control System (pre-loaded and ready)
• ASCOM Driver Support
• INDI/INDIGO Compatibility
• LX200 Protocol Support
• Optional Advanced Hand Controller integration (sold separately unless bundled): 2 inch OLED touch display, Hall joystick, GPS, WiFi, and BLE for full Dashboard, Motion, GoTo, GPS Sync, Power, Wireless, Safety & Limits, and Night Vision control
• WD-20E Drawing