PST Etalon Adjustment
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PST Etalon Adjustment
Hi all...
This isn't a mod question specifically, but I have noticed the etalon in my PST seems to be 'loose' for lack of a better term. Visually it tunes well as you rotate the tuning collar, but if imaging it seems to be loose or sloppy...the image seems to migrate around as pressure is applied to the tuning ring.
I'd like to tighten it up but thought I'd check to see if there were any suggestions. I see there a set screw under the rubber tuning cover, but not sure if it plays a role in this or not.
Any suggestions would be much appreciated.
Thanks,
Brian
This isn't a mod question specifically, but I have noticed the etalon in my PST seems to be 'loose' for lack of a better term. Visually it tunes well as you rotate the tuning collar, but if imaging it seems to be loose or sloppy...the image seems to migrate around as pressure is applied to the tuning ring.
I'd like to tighten it up but thought I'd check to see if there were any suggestions. I see there a set screw under the rubber tuning cover, but not sure if it plays a role in this or not.
Any suggestions would be much appreciated.
Thanks,
Brian
Brian Colville
Maple Ridge Observatory
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Maple Ridge Observatory
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Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: PST Etalon Adjustment
Brian,
The 1.5mm screw you see just registers the inner ring to the outer ring (with one holding the knurled rubber ring).
It can be moved one hole CCW to "improve" the positioning of the red wing - which is always near the end of the travel of the rubber ring....
The sloppiness in the tuning ring is probably caused by the O rings in the assembly flattening over time, these can be replaced to give a firmer feel to the tuning. These can be accessed by removing the screw (note the hole the screw is fitted to in the inner ring and mark with tipex) and removing the outer ring - you'll see the two O rings sitting in the housing.....
The 1.5mm screw you see just registers the inner ring to the outer ring (with one holding the knurled rubber ring).
It can be moved one hole CCW to "improve" the positioning of the red wing - which is always near the end of the travel of the rubber ring....
The sloppiness in the tuning ring is probably caused by the O rings in the assembly flattening over time, these can be replaced to give a firmer feel to the tuning. These can be accessed by removing the screw (note the hole the screw is fitted to in the inner ring and mark with tipex) and removing the outer ring - you'll see the two O rings sitting in the housing.....
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Re: PST Etalon Adjustment
Ken...
Thanks for the guidance on the O-rings. Might be something I can look into on New Years Day when I'm off work.
Brian
Thanks for the guidance on the O-rings. Might be something I can look into on New Years Day when I'm off work.
Brian
Brian Colville
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Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
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C14 + Lunt 80ED
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Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
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WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
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Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
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Re: PST Etalon Adjustment
Some time ago Mark Townley invented a special plastic gasket which dramatically stabilized the tuing process.
He sent several such gaskets to other chat members. Worked well as far as I remember the feedbacks.
Mark, any chance you can publich the drawing(s) of this gasket?
Valery
He sent several such gaskets to other chat members. Worked well as far as I remember the feedbacks.
Mark, any chance you can publich the drawing(s) of this gasket?
Valery
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Re: PST Etalon Adjustment
The CAD file will be floating around on one of my hard drives somewhere, i'll have a look Valery.Valery wrote: ↑Mon Dec 31, 2018 3:50 am Some time ago Mark Townley invented a special plastic gasket which dramatically stabilized the tuing process.
He sent several such gaskets to other chat members. Worked well as far as I remember the feedbacks.
Mark, any chance you can publich the drawing(s) of this gasket?
Valery
*Edit* - I've had a look, possibly have located the file however I don't have the software on this laptop to open the (.dtd) file. I'll explore more at work next week.
Mark
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Re: PST Etalon Adjustment
Hi Mark...
No worries if you can't get a functional file.
Does anyone have a pic of the etalon/o-rings? I assume that it is necessary to dismantle the etalon to access them, as I don't see any hint of them after removing the tuning ring. There is a space between the rotating tuner and the housing and there seems to be more slop as you rotate to one extreme compared to the opposite direction.
Brian
No worries if you can't get a functional file.
Does anyone have a pic of the etalon/o-rings? I assume that it is necessary to dismantle the etalon to access them, as I don't see any hint of them after removing the tuning ring. There is a space between the rotating tuner and the housing and there seems to be more slop as you rotate to one extreme compared to the opposite direction.
Brian
Brian Colville
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
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Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
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Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
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Re: PST Etalon Adjustment
Brian,
-Remove the rubber knurled ring
-Look for the small Philips head screw in the outer ring
-Remove the screw
-Slide the outer ring off the housing
-Look at the outer surface of the housing - you'll see the two O rings
NB make a note of the hole that the screw was sitting in (on the inner ring visible through the slot in the housing).
Next time I pull a PST apart I'll get some photos for reference.
Hope this helps
-Remove the rubber knurled ring
-Look for the small Philips head screw in the outer ring
-Remove the screw
-Slide the outer ring off the housing
-Look at the outer surface of the housing - you'll see the two O rings
NB make a note of the hole that the screw was sitting in (on the inner ring visible through the slot in the housing).
Next time I pull a PST apart I'll get some photos for reference.
Hope this helps
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Re: PST Etalon Adjustment
Thanks Ken, I'll have to take a closer look at the etalon...just didn't stand out when I disassembled as you described.
Brian
Brian
Brian Colville
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
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Re: PST Etalon Adjustment
Brian,
Hmmm - were the O ring grooves visible....may be no O rings there!!!!
Hmmm - were the O ring grooves visible....may be no O rings there!!!!
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Re: PST Etalon Adjustment
Brian,
Some images of the PST, rubber ring removed, tuning ring removed, O rings visible....
Hope this helps...
Some images of the PST, rubber ring removed, tuning ring removed, O rings visible....
Hope this helps...
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Re: PST Etalon Adjustment
Brian,
Just removed and measured the O rings...
They appear to be 47mm inside diameter x 1.7 diameter.
The retaining grooves seem to be 1.8mm wide x 1.45mm deep.
Hope this helps. [Edit] The nearest standard size seems to be 47.35mm inside x 1.78mm diameter.
Just removed and measured the O rings...
They appear to be 47mm inside diameter x 1.7 diameter.
The retaining grooves seem to be 1.8mm wide x 1.45mm deep.
Hope this helps. [Edit] The nearest standard size seems to be 47.35mm inside x 1.78mm diameter.
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Re: PST Etalon Adjustment
Brian,
I’ve just be advised that the newer PST (< five year old(?) with anodized aluminum gold tube) don’t appear to have these Orings...never stripped one so don’t know how they maintain the outer tuning ring.
Can anyone confirm this, photos?......
I’ve just be advised that the newer PST (< five year old(?) with anodized aluminum gold tube) don’t appear to have these Orings...never stripped one so don’t know how they maintain the outer tuning ring.
Can anyone confirm this, photos?......
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Re: PST Etalon Adjustment
My PST has the O-rings, I just overlooked them since I was not looking for them in that location. They are a lot finer than any I'm used to as well. They look to be in pretty good shape but I can check on a replacement set.
It looks like they are meant to keep the tuning ring from 'rocking' which would cause the etalon to tilt a bit with the one pin lockign it in place...sound right?
Brian
It looks like they are meant to keep the tuning ring from 'rocking' which would cause the etalon to tilt a bit with the one pin lockign it in place...sound right?
Brian
Brian Colville
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: PST Etalon Adjustment
Brian,
That's part of the concern....
I've ordered a pack of the replacement O rings - when they arrive I'll confirm fitment and offer them to any members in need.
That's part of the concern....
I've ordered a pack of the replacement O rings - when they arrive I'll confirm fitment and offer them to any members in need.
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Re: PST Etalon Adjustment
Ken...
When I looked at the housing I though the o-rings were just a preformed ridges not individual rings...that was why I missed them, LOL.
Brian
When I looked at the housing I though the o-rings were just a preformed ridges not individual rings...that was why I missed them, LOL.
Brian
Brian Colville
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: PST Etalon Adjustment
Hmmm
Another cost saving exercise?????
Another cost saving exercise?????
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Re: PST Etalon Adjustment
Just an update....
The new O rings arrived.
They fit perfectly!
110% improvement in the tuning ring "stability".
I have some spares, drop me an email if you need a set.
Ken
The new O rings arrived.
They fit perfectly!
110% improvement in the tuning ring "stability".
I have some spares, drop me an email if you need a set.
Ken
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
- Merlin66
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Re: PST Etalon Adjustment
Bart,
If the knurled rubber tuning ring feels "loose", then there's a good chance that the O rings have flattened over time and the replacement would help make it feel firmer.
If the knurled rubber tuning ring feels "loose", then there's a good chance that the O rings have flattened over time and the replacement would help make it feel firmer.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: PST Etalon Adjustment
Thanks Ken. Will check it out. The thing is that I don't really know how it is supposed to feel..... Never had a new PST etalon in my hands.
- Merlin66
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Re: PST Etalon Adjustment
Snug firm and tight....
(I'll enclose a couple of the O rings in your "package" )
(I'll enclose a couple of the O rings in your "package" )
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
- solarchatted
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Re: PST Etalon Adjustment
SolarChatted
https://astronomo.space/my-images/the-sun/
https://www.youtube.com/@Astronomo_Space
Solar Gear:
Bresser AR90/900 + PST mod + SW Auto Focuser ...
Sometime I use Explorer Scientific AR152/988 + Used once only... Altair 2" Solar Wedge (very good indeed)
Will try and do it justice when I can with the help of various filters, Baader 1.25" Solar Continuum 10nm is one.
SW 72ED Pro - fixed 'stock faulty' focuser ... 'I think' !
https://astronomo.space/my-images/the-sun/
https://www.youtube.com/@Astronomo_Space
Solar Gear:
Bresser AR90/900 + PST mod + SW Auto Focuser ...
Sometime I use Explorer Scientific AR152/988 + Used once only... Altair 2" Solar Wedge (very good indeed)
Will try and do it justice when I can with the help of various filters, Baader 1.25" Solar Continuum 10nm is one.
SW 72ED Pro - fixed 'stock faulty' focuser ... 'I think' !
- solarchatted
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Re: PST Etalon Adjustment
I did receive them, but I have not replaced them yet.
The other day I dismounted them again, as I remembered there were various threaded-holes in it and at the same time I found that article about changing where you place the screw.
Well, to make it short I moved it from 1 to number 3 and now the tuner is almost in the middle and seems much smoother.
Someone before me put their hands in and I guess put it back incorrectly + I guess it got 'banged' one!
The other day I dismounted them again, as I remembered there were various threaded-holes in it and at the same time I found that article about changing where you place the screw.
Well, to make it short I moved it from 1 to number 3 and now the tuner is almost in the middle and seems much smoother.
Someone before me put their hands in and I guess put it back incorrectly + I guess it got 'banged' one!
SolarChatted
https://astronomo.space/my-images/the-sun/
https://www.youtube.com/@Astronomo_Space
Solar Gear:
Bresser AR90/900 + PST mod + SW Auto Focuser ...
Sometime I use Explorer Scientific AR152/988 + Used once only... Altair 2" Solar Wedge (very good indeed)
Will try and do it justice when I can with the help of various filters, Baader 1.25" Solar Continuum 10nm is one.
SW 72ED Pro - fixed 'stock faulty' focuser ... 'I think' !
https://astronomo.space/my-images/the-sun/
https://www.youtube.com/@Astronomo_Space
Solar Gear:
Bresser AR90/900 + PST mod + SW Auto Focuser ...
Sometime I use Explorer Scientific AR152/988 + Used once only... Altair 2" Solar Wedge (very good indeed)
Will try and do it justice when I can with the help of various filters, Baader 1.25" Solar Continuum 10nm is one.
SW 72ED Pro - fixed 'stock faulty' focuser ... 'I think' !
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Re: PST Etalon Adjustment
Hi Mark,
Any progress on finding the gasket file?
I am getting there on my PST mod and the sweet spot is definitely off centre it seems to me.
Andrew.
Any progress on finding the gasket file?
I am getting there on my PST mod and the sweet spot is definitely off centre it seems to me.
Andrew.
- marktownley
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Re: PST Etalon Adjustment
I can't find the file, I guess it was on a hard drive of old.
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!