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KOSMO

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Reply with quote  #1 
I won't take total credit for this idea. Comptech probably originated it while he was at my house recently.  We were trying to line up a C band LNBF to the center of the prime feed dish. We were sorta forced to use the scalar ring that came with the horn because the other scalar was slightly small and the horn wouldn't go inside. But what was nicer about the old dual C/Ku scalar was the fact that it had two fixed pads 120 degrees apart and just ONE screw in the third location to tighten the whole thing down.

This new horn (a titanium) had 3 screws at 120 degrees apart and it was NOT FUN trying to get this thing to stay put and stay straight. You see the screws act like little points where as the pads on the other one are bigger than a screw tip and thus not a lot of wiggle.

And we sorta both had the idea if only we had a Laser pointer so we could put that dot right in the middle of the dish.

Obviously the laser itself must be orthogonal or plumb or all bets are off. At first I considered something for the inside diameter of the waveguide. Something perhaps like a circular disk or even a little bit conical with a plumb hole centered in the middle (drill press) to mount a laser pointer. Then I realized that at least in my case there is enough of the horn protruding that the mounting bracket could go across the face of the horn and screw tighten with knurled screws on the outside.

Has ANYONE bought or homebrewed a laser mount for the business end of a C band waveguide? 

A great idea for a vertical market product I bet.

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Taylors, SC LinkBox 9000i, AZBox Prem+, Fortec Star 90cm with H-H Motor & Invacom (Ku) Linear/Circ 4 output LNBF, 7.5' UniMesh  56" fiberglass Prime feed with invacom SNH-031 (Ku).
babadem

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Reply with quote  #2 
Did you take any pictures?
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Amiko-A3, AZBox Me, MicroHD, and TBS6903. DG-380 Motor (43.1°W to 127.0°W), on 1.2M Geosat Pro.  3ABN Dish @30.0°W. 2nd 1.2M looking @103.0°W. 12FT Paraclipse Dish looking from 37.5°W to 111.1°W.
RimaNTSS

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Reply with quote  #3 
I've used several laser-pointers for LNB pointing. I simply replace LNB by laser and adjust holder properly.
AdapterLazer (Custom).JPG IMG_20140922_130133 (Custom).jpg IMG_20140923_214801 (Custom).jpg IMG_20150216_215956 (Custom).jpg IMG_20150325_182606 (Custom).jpg Laser (Custom).JPG P1290543 (Custom).JPG P1430287 (Custom).JPG 

majortom

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Reply with quote  #4 
I have used a laser 'ruler' where I shot it at the center of the reflector from the face of the feed throat to spot the focal length. Kinda worked.
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Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
andyinyakima

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Reply with quote  #5 
majortom,

You peaked my curiousty, I'll have to look around the local box stores for 1/16" resolution for under $50.
I did find one on the web; then I also found a Bosch for $350 with 1mm resolution

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andyinyakima
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Recs: TBS6983, TBS5925 __ Ant: 90cm on SG6100__OSes: Linux with v4l-updatelee drivers __ RPi2 with v4l-updatelee drivers

Open Book, Open Source, You have to Open it to Know what's in it!
majortom

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Reply with quote  #6 
I think I bought mine at 'home debit'
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Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
majortom

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Reply with quote  #7 
andy, dug mine up.
This is what I have, https://www.google.com/?gws_rd=ssl#q=bosch+glm40

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Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
Joe

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Reply with quote  #8 
here is a link to previous post

https://rickcaylor.websitetoolbox.com/post/laser-pointer-to-align-feedhorn-7184702

check this one, should be inexpensive to build, post # 20

https://rickcaylor.websitetoolbox.com/post/laser-pointer-to-align-feedhorn-7184702
midwestmac

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Reply with quote  #9 
I've purchased the cheap 5 dollar laser pointers that go on to a keychain and they're not so great.
It was off by a half inch, in 3 feet.
I bought another small one for 30 dollars at office depot, for pointing at a chalk board I guess? Its small and works with what Joe posted above, with a Lnb cap and a piece of wood.
I think as far as shopping for lasers go you just need one that shoots straight within 4 feet away.
 

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RimaNTSS

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Reply with quote  #10 
I used one of those http://www.everbuying.net/product1078731.html very precise as they made for special task.ScreenHunter_674 Mar. 17 18.00.jpg 
RimaNTSS

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Reply with quote  #11 
I've made this 40/65mm adapter which fits inside the C-band or Ku-band LNB-holder. And then there is laser-pointer inside the adapter shows where feed is pointed. IMG_20170322_191335 (Large).jpg IMG_20170322_191140 (Large).jpg IMG_20170322_191222 (Large).jpg 
MattF

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Reply with quote  #12 
I used a laser that mounts to the end of a golf club. I couldn't be sure it was perfectly centered in the plastic case so I would spin it 360° and find the center point that way, worked pretty good.
RimaNTSS

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Reply with quote  #13 
Had modified the adapter to fit the open throat of the C-band LNB. Rubber ring helps adapter to stay centered.

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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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