Diy dew heater
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Diy dew heater
Looking at this guide
https://www.deepskywatch.com/Articles/n ... eater.html
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
That's a shame!
yobbo89 wrote: ↑Sun Jun 11, 2023 7:00 am Looking at this guide
https://www.deepskywatch.com/Articles/n ... eater.html
Well the project might not have worked but the deepskywatch link is a good one!
Thanks
Graeme
Celestron 9.25 f10 SCT, f6.3FR, CGX. Sky-Watcher Evostar-120, HEQ5
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Re: Diy dew heater
I used homemade dew heaters for years.
I tried the resistor method. It worked, but it was troublesome to limit flexing as not to break a solder connection.
The nichrome wire/duct tape works great. I bought the wire from Jacobs Online. They sold different gauges with varying ohms/ft.
I used them for years, but they looked kind of funky and they left the tape glue residue on my tube.
I ended up buying Dew-Not straps and used them with the super cheap led lighting controllers that I bought on Amazon for about $4.
[attachment=0]IMG_5546.jpeg
I still use the cheap led light controllers (about 5 years). One setup for each scope controlling two dew strap each (I try to size the straps appropriately so that I can use a single controller).
So, if you consider going with a homemade setup, consider using a let lighting controller.
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
Sky: Bortle 6-7
My Astrobin: https://www.astrobin.com/users/Juno16/
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Re: Diy dew heater
Bodge job, never seen a product with this, didn't even hot glue the cap, rethinking buying another Kendrick..
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
Hmm I might just do this, beats standing out in the cold with a hair dryer xdJuno16 wrote: ↑Sun Jun 11, 2023 11:40 am Hi Rob,
I used homemade dew heaters for years.
I tried the resistor method. It worked, but it was troublesome to limit flexing as not to break a solder connection.
The nichrome wire/duct tape works great. I bought the wire from Jacobs Online. They sold different gauges with varying ohms/ft.
I used them for years, but they looked kind of funky and they left the tape glue residue on my tube.
I ended up buying Dew-Not straps and used them with the super cheap led lighting controllers that I bought on Amazon for about $4.
[attachment=0]IMG_5546.jpeg
I still use the cheap led light controllers (about 5 years). One setup for each scope controlling two dew strap each (I try to size the straps appropriately so that I can use a single controller).
So, if you consider going with a homemade setup, consider using a let lighting controller.
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
I use the Kendrick controller/ straps, some of them are 15 years old and other than sewing in a new piece of the stretch material they still operate well.
The only culture I have is from yogurt
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Re: Diy dew heater
ok i found a controller, would know how many amps for the psu i would need roughly?Juno16 wrote: ↑Sun Jun 11, 2023 11:40 am Hi Rob,
I used homemade dew heaters for years.
I tried the resistor method. It worked, but it was troublesome to limit flexing as not to break a solder connection.
The nichrome wire/duct tape works great. I bought the wire from Jacobs Online. They sold different gauges with varying ohms/ft.
I used them for years, but they looked kind of funky and they left the tape glue residue on my tube.
I ended up buying Dew-Not straps and used them with the super cheap led lighting controllers that I bought on Amazon for about $4.
[attachment=0]IMG_5546.jpeg
I still use the cheap led light controllers (about 5 years). One setup for each scope controlling two dew strap each (I try to size the straps appropriately so that I can use a single controller).
So, if you consider going with a homemade setup, consider using a let lighting controller.
https://au.mouser.com/ProductDetail/JKL ... XoQAvD_BwE
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
yobbo89 wrote: ↑Mon Jun 12, 2023 2:11 pm ok i found a controller, would know how many amps for the psu i would need roughly?
https://au.mouser.com/ProductDetail/JKL ... XoQAvD_BwE
Hello Rob
My STC has a heated dew shield and a lens heater ring. They pull 1.5A and 0.8A at 80% on 12V. Not sure which is which! 2A should suffice. So go for 3A!
Your link is broken, it says the site is temporarily unavailable.
Graeme
Celestron 9.25 f10 SCT, f6.3FR, CGX. Sky-Watcher Evostar-120, HEQ5
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Re: Diy dew heater
I found this one on Highpoint Scientific for an 8" diameter (30" long) that draws 14 watts at 12vdc (1.18A). https://www.highpointscientific.com/dew ... trip-dn009.
So, like Graeme said, maybe 3A?
I bought several (I think that I have 7 total) LED 12vdc power supplies (5 amp and 6 amp that run of household power) to power my mount, cameras, focuser, all of that stuff. They are cheap and work well.
I use one dedicated to the dew heaters.
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
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Re: Diy dew heater
OK cheers, I have a spare 5amp,i got two of those controllers from your image , they are the same ones from mouser, I also got some replacement components for my Kendrick and another pic16, but doubt Kendrick would give me firmware to Flash it.Graeme1858 wrote: ↑Mon Jun 12, 2023 3:02 pmyobbo89 wrote: ↑Mon Jun 12, 2023 2:11 pm ok i found a controller, would know how many amps for the psu i would need roughly?
https://au.mouser.com/ProductDetail/JKL ... XoQAvD_BwE
Hello Rob
My STC has a heated dew shield and a lens heater ring. They pull 1.5A and 0.8A at 80% on 12V. Not sure which is which! 2A should suffice. So go for 3A!
Your link is broken, it says the site is temporarily unavailable.
Graeme
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
Very nice, I'd love to see an image of one of his or someone else's they made,Lady Fraktor wrote: ↑Sun Jun 11, 2023 4:44 pm UlteriorModem (Tom) used to build dew straps for people.
I use the Kendrick controller/ straps, some of them are 15 years old and other than sewing in a new piece of the stretch material they still operate well.
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
yobbo89 wrote: ↑Tue Jun 13, 2023 5:42 amVery nice, I'd love to see an image of one of his or someone else's they made,Lady Fraktor wrote: ↑Sun Jun 11, 2023 4:44 pm UlteriorModem (Tom) used to build dew straps for people.
I use the Kendrick controller/ straps, some of them are 15 years old and other than sewing in a new piece of the stretch material they still operate well.atm I'm just going to wrap it in duck tape..
I just recently tossed my home made duct tape straps! I made them just shy of the circumference of the tube/shield and used a small piece of adhesive velcro to secure it to the scope. The duct tape/nichrome wire straps worked great for years.
Be aware though, soldering to nichrome wire is challenging. Do try it on a test piece first to get an idea.
I do still use the controllers that I sent you an image of, but I like the neat look of the DewNot strips. They are not too expensive and they look and feel nice.
Good luck and let me know how it goes!
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
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Re: Diy dew heater
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
Celestron 9.25 f10 SCT, f6.3FR, CGX. Sky-Watcher Evostar-120, HEQ5
ASI1600MM Pro, ASI294MC Pro, ASI224MC
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https://www.averywayobservatory.co.uk/
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Re: Diy dew heater
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
Hi Rob,
I am a super rusty on the calcs, but I would think that you would need to lower the resistance to lower the heater wattage?
Maybe make a new strip with less nichrome wire or obtain a different ohm/meter wire gauge to allow you to make a couple of loops of wire for the heater strip.
Again, I haven't done this in awhile, but what I originally did was to look for a commercially made strip for the length that I needed.
For example, for my 4" frac dew shield has about a 6" diameter. (I put the sew strip on the dew shield).
I looked up the wattage for a dew strip for a 6" scope and found this. https://www.highpointscientific.com/dew ... trip-dn007.
The wattage for this 6" strip is 9.6 watts (I rounded it to 10). So, that is the wattage that I went for.
Using the calculation V*V/P=R (vdc*vdc/power=resistance), I calculated 12*12/10 = 14.4 ohms. So I needed enough nichrome wire to total 14.4 ohms to give me a 10 watt strip.
I bought 28 gauge nichrome wire so that I could get about two wraps of wire around the length of the strip. A 6" diameter strip would be about 18" long, so I wanted a nichrome wire gauge that would enable me to use a piece of wire about 36" (3 ft).
28 ga nichrome wire is 4.25 ohms/ft, so 3 ft would give me the resistance of 12.75 ohms. I just added a small bit extra (started a third wrap) to get to the needed 14.4 ohms.
You can actually place a ohm meter probe at one end of the wire and slide it down the wire until the desired resistance is obtained and cut it there.
Extremely, extremely poor diagram.
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
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Re: Diy dew heater
If your wire is 7Ω and you have 7V across it, then
I = V/R
I = 7/7
I = 1A
And:
P = VxI
P = 7x1
P = 7W
At 12 V it would be:
I = V/R
I = 12/7
I = 1.7A
Then:
P = VxI
P = 12x1.7
P = 20.5W
Your temperature is too high at the lowest voltage, so try adding another 7Ω resistor in series to reduce the current flow.
Then:
I = V/R
I = 7/(7+7)
I = 0.5A
So:
P = VxA
P = 7x0.5
P = 3.5W
On full at 12V:
I = V/R
I = 12/(7+7)
I = 0.86A
And:
P = VxA
P = 12x0.86
P = 10.3W
If that gives you a temperature that's too low then change the 7Ω to a 3Ω resistor in series. I don't know if you can get 7Ω and 3Ω resistors, but you get the picture.
Then on low at 7V
I = V/R
I = 7/(7+3)
I = 0.7A
So:
P = VxA
P = 7x0.7
P = 4.9W
On full at 12V:
I = V/R
I = 12/(7+3)
I = 1.2A
And:
P = VxA
P = 12x1.2
P = 14.4W
Hope that helps a bit more than my last post!
Graeme
Celestron 9.25 f10 SCT, f6.3FR, CGX. Sky-Watcher Evostar-120, HEQ5
ASI1600MM Pro, ASI294MC Pro, ASI224MC
ZWO EFW, ZWO OAG, ASI220MM Mini.
APM 11x70 ED APO Binoculars.
https://www.averywayobservatory.co.uk/
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Re: Diy dew heater
This is for my secondary mirror so I need a small heater , does this look right ? well i know the scope will suck alot of heat out of the wire, i just don't want to cook anything .
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: Diy dew heater
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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