3 Stages to No More Dew
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- Опубликовано: 4 окт 2024
- Some designs of telescopes are notoriously difficult to keep dew-free. SCTs are great examples. Summer nights develop extremely high humidity at the location of the Sky Story Observatory, and trial and error has led to a simple, accessible strategy to keep dew off the telescope that has worked even when half the night has been at the dew point with 99% humidity.
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The reason that dew heater ring causes artefacts is Celestron set it to run flat-out when connected to the 12v. Celestron of course want you to buy their own dew controller which is really big and really expensive, so most people don't bother buying that and just plug the ring into the 12v directly. Celestron should really supply it with a resistor plug to cut it down to 10-20% output, which is fine for most of the time. Also, I'd be concerned that you're introducing tube currents with your extra dew heater strap...
I think a cheap dew ring and absurdly expensive power box was part of the Celestron marketing plan. In any event, the trick is keep the power running just warm enough to eliminate dew which the PA PowerBox does very well.
@@SKYST0RY Exactly my thinking. They set up the dew ring and their new dew shields to get unaware Celestron buyers into the mindset that they all work together, instead of it just being independent components. The sheer size of the celestron power box is absurd to me, it feels like how sports cars are marketed not astro gear.
And yeah I use the same PPB Micro as you :) brilliant aren't they?
@@SquillagusNiggle or more aware and can understand the advantage of a feedback loop on each channel so the temperature can be controlled. PA take cheap shortcuts. Wandera copy PA but do it better with feedback from each dew strap. Trouble is sensor isn’t compatible with celestron. If PA did proper engineering, a competitor would stop celestron taking advantage of others poor engineering
I have been using the Kendrick dew controllers and bands for over thirty years and they work great. I am currently using the Kendrick digifire controllers on both of my rigs, Askar FRA 400 and Meade 16” SCT and I never have to worry about dew on the lens or corrector plate.
I am definitely happy with it. Pretty solid construction.
I use the Pegasus Astro Advanced version to get more USB ports. I’ve split the power between the power distribution and the mini computer in case the power gets interrupted . Thanks for the great video.
The Advanced is a very nice power box. Good smooth power and the internet control makes it even better. Maybe one day if I ever decide to mount the mini PC on the telescope I might go for something like that.
Absolutely love your videos plz keep it up they are very interesting and you are passing on your knowledge
Thank you so much! It's been a labor of love.
I also own that dew ring for my 9.25hd and my first 3 nights using it were kind of a mess. Very weird star shapes. I touched the ring after some shots and it was very hot... Ofc, I didn't need that heat to remove dew, but I realized it was full power. You can control that using some dee controller from Celestron or any other manufacturer. I reduced the power to 25% and looks better now.
You definitely want a controller to keep only just sufficient power on the dew ring, because just plugging in the dew ring to a power source will make it run at full power and become very hot and this worsens stellar artifacting. The Edge is, I hear, more prone to this than the standard Celestron SCT.
Interesting.
The issue is that Pegasus doesn’t have the ability to sense the temperature on the corrector plate. As such, it’s always a guess. I used the celestron controller that will monitor temperature at each strap and control the power so it doesn’t overheat the area automatically. Primaluci have an adapter to convert that sensor to its system so the eco can also sense the temperature but as I don’t have a primaluci computer, I’ve not tried it.
A lot of folks reported they were getting especially bad artifacts with the Celestron controller, which was independently traced back to the wave form it generates. Besides, the Celestron controller only senses the temperature of the corrector plate at the point of sensor contact. I found that the Pegasus PowerBox was easy to setup. I just experimented by slowly cranking it up till I found the minimum point where the corrector plate stayed dew free in bad conditions.
@@SKYST0RY I looked into many reports on the dew ring. The complaints seemed to be using controllers without feedback. The output of the celestron controller is just PWM. Just like any other variable controller. You can also vary the aggressiveness (or power applied on average) just like any controller using PWM. Nothing special or unique about that. Re Pegasus, I know many people are happy but that doen’t change it is inferior to a controller with feedback. Wandera controller seems to be a Pegasus copy but with feedback loop on each channel. A way better idea. It’s just physics. Problem with wandera is no adapter exists to convert their temperature control channel to celestron (Primaluci has an adapter)
What is your dog"s name?
We call him Ghillie Dhu.