Geometric, gravitational flexure and eccentric bearing errors within the mount/OTA along with runout error if the encoder axis is not parallel to the mount axisĬan degrade the effective pointing performance.Īrgo Navis™ has an advanced feature called the Telescope Pointing Analysis System™ (TPAS™) that can help analyze and often compensate for That corresponds to around 2.16 arc minutes per step. Most of our encoder kits provide a resolution of 10,000 steps per axis. When interfaced to a ServoCAT, Argo Navis™ then provides full "slew and track" capability to the telescope. Having said that, Argo Navis™ can also be interfaced to some third party servo motor controllers, the best known of which is the ServoCAT. Some refer to this type of telescope location system as a 'PUSHTO' system, because you push the mount. You use what John Dobson might have referred to as "yoghurt power". In either axes and the encoder rotates under that power. Instead, you use your own muscle power to push the telescope Argo Navis™ then keeps track of the pulses in order toĭetermine the physical orientation of each axis. One encoder is attached to each of the two axes of the mount. The photodetector converts the light pulses intoĮlectrical pulses which are then transmitted to the Argo Navis™ Digital Telescope Computer via a cable. As the shaft rotates, so does the disk, causing the zebra crossing patterns to alternatelyīlock light from an internal LED or allow it to pass to a photodetector. Inside the body is an otherwise clear optical disk with zebra crossing pattern You can find a picture of an optical encoder here. If you are a telescope builder and require a custom encoder mount solution, email us. The USB Serial Adapter and the Argo Navis™ External DC Power Cable. The options you might then consider are the Argo Navis™ Serial Communications cable, Use the "Bundled Special System" pulldown on the purchasing page and then enter a Qty of 1. This includes an Argo Navis™, encoders, encoder mount hardware specific to the mount you own and an encoder cable. The most cost effective way is to consider purchasing one of our Bundled Special Systems. However, if you have a commercial mount, you might wish to take advantage of our large range of If you are mechanically inclined, you might then devise your own encoder mounting hardware toĪttach the encoders to the mount. In a nutshell, to bring computerized pointing to your mount, you will require an Argo Navis™ Digital Telescope Computer, a pair of How can I interface Argo Navis™ via Bluetooth to a planetarium program such as Sky Safari™? How can I interface Argo Navis™ via WiFi to a planetarium program such as Sky Safari™? What planetarium programs can Argo Navis be interfaced to? If the lithium coin cell should become depleted, will I lose my setups? Should I replace it now? I want to perform the initial alignment on a star that is not in MODE ALIGN STAR. I spin the DIAL in the BRIGHT STAR catalog, but there appears to be hardly any entries. I've used some digital setting circles where there is no need to perform the FIX ALT REF step. How do I establish the encoder direction senses for my Dob? If I have both internal batteries and an external power source, which one does Argo Navis™ draw power from? Can I replace it with an Argo Navis™ DTC and retain my encoders?Ĭan I use an inclinometer instead of an encoder on the altitude axis of my Dob? What is the difference between a Digital Telescope Computer (DTC) and a Digital Setting Circle (DSC)? Is that just a marketing name? Will the optical encoder move the mount like a motor? I've looked at the purchasing page but I am still unsure what I need to buy. Background for those new to the world of telescope computers
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