Wanted ku band elbow for a chaparral corotor .

jeallen01

jeallen01

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"Left side" suggestion (again)!

As long as there is a "half" of a ring slot in one flange, run a small bead of NON-ACIDIC silicone sealant (it does exist!) around that so that it stands as "proud as possible" of the flange, and then let it cure - hopefully that will then seal the joint when the elbow is bolted up to it tightly (and then, maybe, run some more of the same sealant around the outside of the bolted-up joint to reduce the possibility of moisture entering the joint from that direction).

I used another variation of this approach when I had to seal the lid to the main part of the plastic box that houses the Smart Priority Switches (SPS) which allow me to select the dishes/LNBs down the garden from either the lounge or our "office" upstairs - the box came with a "rubber" sealing "ring" which proved impossible to keep in-place when the lid was fitted, and so I hit on this "alternative solution", and that has prevented any noticeable moisture entering the box for at least 3-4 years! :)
 
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subman

subman

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Thanks for the Feed back Jeallen01 Well the O ring and screw kit has not yet arrived from SMW but I will look at all the options as the last thing I want is water getting into the waveguide .But like you say just add a very small amount of Non-Acidic silicone sealant same stuff I use on my andrew plugs when I cant use self amalgamating tape . As far as making a hood to go over the LNB thats one more thing to think about held in place by tie wraps .
Or
If companys were not in lock down just get a small local engineering comany to cut a small round groove in thev elbow and slip a O ring in that way .
Or
Try and remove the old elbow from the old corotor .
Or
Just bolt the LNB straight onto the corotor since it has a O ring on the LNB side .The problem doing this is you would have to drill out the thread on the corotor flange then install your 4 bolts . 2 of the bolts you have access but the 2 others may need to be cut down a few mm or install 4m studs then add nuts to the exposed studs on the bottom of the corotor flange . Adding a nut should be easier than trying to stab a bolt into the corotor flange + LNB and then doing it up .

But who knows I might find a duff corotor that I can remove the elbow from . Any cant do a thing untill the O ring and screw arrive but finding a replacement elbow was never going to be easy as it needs to be Male one side and the other Female .
 

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Channel Hopper

Channel Hopper

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I’ve never had a transfer leak once the two surfaces are bolted together and self amalgamating tape is wound around the outside

Or you could use one of those conical cover options that fits over the feed and LNBs which clamps to the feedarms, the impact on reception on a 3m+ dish is going to be negligible
 
Trust

Trust

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Why do you want that Ku lnb sidewards ? does it not fit with a proper elbow backwards ?
 
Channel Hopper

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Why do you want that Ku lnb sidewards ? does it not fit with a proper elbow backwards ?
A 'proper' elbow ?

The Chaparral corotor uses an E plane design elbow, all OMT designs I have here are H-plane.
 
Trust

Trust

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subman

subman

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echostar 3600
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essex
The Waveguide is at a different angle so the LNB has to go left or right it cannot sit straight in line as the chaparral corotor elbow does . Look at the attached picture . Plus the holes dont line up at the flange because the wavguide is out of alignment , One is vert + the other Hoz

So its down to bolting the LNB onto this elbow and having it go off at a angle and then sealing off the male elbow flange to the male flange on the corotor .

Or plan C bolt the LNB straight onto the corotor using 4 mm studs into the base of the LNB then add washers and nuts to under the corotor flange .


Or I try to get the old Elbow off the old corotor , If I can get the old elbow off I can use that I have put a request out to all satelite forums for a someone who may have a old duff corotors . Oh yes the O ring that came with the Elbow does fit the SMW LNB . As for making sure the 2 male flanges or water tight I think a thin layer of Non-Acidic silicone sealant then a few wraps of self amalgamating should do the job .
 

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Channel Hopper

Channel Hopper

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Or I try to get the old Elbow off the old corotor , If I can get the old elbow off I can use that I have put a request out to all satelite forums for a someone who may have a old duff corotors . Oh yes the O ring that came with the Elbow does fit the SMW LNB . As for making sure the 2 male flanges or water tight I think a thin layer of Non-Acidic silicone sealant then a few wraps of self amalgamating should do the job .
I hope you have already got the bolts in soak since they look like they are not going to come out easily, the corotor does not have blind holes from memory so the fluid should get to the importanrt areas.

It may be worth using a molegrip in conjunction with a torx driver, grab the head of the bolts at the same time whilst you undo them.
 
nelson_b

nelson_b

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Heating the joint and screws (as much as you dare ) with a blowtorch or hot air gun - can work wonders .... and break the bond between the steel screws and the alloy.
 
subman

subman

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Evening Guys yes its all in soak and I have the blowtorch ready but I have a feeling the bolts will shear off as I can get a spanner and a socket on them I cant heat them up to much without damaging the LNB . If however the bolts do shear off I should be able to remove the LNB then we have the 4 x Torx yes I can try with the molegrip for a bit of extra torque . If I can remove the old elbow it would be more straight forward but nothing on this project is straight forward .
 

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