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08-01-2006, 11:27 PM
|  | DVR Addict~Mad Scientist | | Supporting Founder Join Date: Mar 16th, 2004 Location: Satsuma, AL
Posts: 6,293
| | | Mad Scientist strikes again! Poor Man's DISH500+/1000+
Using an old Primestar dish, the feedhorn from the Primestar LNBF, a disused 105 FSS LNBF unit, and a critical part from a fried 105 SuperDish type 2 110 LNBF, I have successfully built a dish that receives 118 KU circular signal. This, integrated with the DPP44 and the repurposed and zip-tied Superdish that gets 110, and 119 gives me the equivalent of the new, rare and expensive DISH500+, taking up only four times the backyard space of a real one. I could add another LNBF at 129 for a DISH1000+ equivalent.
I must give credit to Smith, P as it was his posts here and elsewhere that inspired this, specifically how to convert a linear LNBF to circular. He did the initial work but many of us would agree, his writing style leaves much to the imagination and much to be figured out through constant research. 
With slight trimming, the dielectric barrier found within the SD-type2 110 LNBF (the pencil-point one) can be made to fit within the PrimeStar feedhorn. The 105 FSS LNB is attached to the feedhorn and adjusted for proper skew, then the dielectric piece is inserted at a 45 degree angle into the feedhorn. (this leads me to believe that the 110 piece, were it not fried, is now a linear LNBF for DBS frequencies, if such a thing were useful).
This was a fun and frustrating project. I am successfully getting KBS World (channel 9850) and the "Congratulations, you have 118" placeholder.
Photos: back view, front view, side view, skew adjustment, superdish lnbs. Note the dielectric piece inside the feedhorn is at a 45 degree angle relative to the LNB as adjusted for skew, not the feedhorn itself. The superdish was repointed by peaking the original 110 LNB on 119, thus 119 becomes 129 and the one added on the other side becomes 110. The skew had to be adjusted, increased signal on average about 5-10 points per transponder.
Last edited by Pepper; 08-03-2006 at 07:40 PM.
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08-01-2006, 11:52 PM
|  | Proud Staff Member | | Proud Staff Member Join Date: Apr 3rd, 2005 Location: Michigan - Economy #50
Posts: 7,311
| | | Wow, this may be the first scientist project that could cost an average person more than just buying the new dish for $140. Obtaining the primestar dish, lnbs, and knowledge sounds tough on this one.
I'm looking forward to seeing the pictures on this one. I remember SmithP saying he had converted an LNB for this, but his signal was in the 40s. How does your signal strength look? |
08-02-2006, 06:35 AM
|  | Pub Member / Supporter | | Pub Member / Supporter Join Date: Aug 16th, 2004 Location: Seven Valleys, PA
Posts: 6,773
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08-02-2006, 10:52 AM
| | DVR Addict~Mad Scientist
Topic Starter
| | Supporting Founder Join Date: Mar 16th, 2004 Location: Satsuma, AL
Posts: 6,293
| | | yeah, I'll get some pictures posted soon.
Just doing something with spare parts that were lying around, didn't cost me anything except the time.
Without any fine-tweaking yet, I'm seeing around 75 (ViP622 strength numbers) on a few transponders. I think the difference may be in using the P* feedhorn which is designed specifically for the dish. |
08-02-2006, 10:57 AM
| | Banned | | Join Date: Aug 1st, 2006 Location: EU NANTWICH UK
Posts: 20
| | pictures? love to see you new sunblocker ....
thks
jurdy |
08-02-2006, 10:57 AM
|  | SatelliteGuys Junkie | | Join Date: Feb 10th, 2006 Location: Waterloo, Iowa
Posts: 4,340
| | | I picked up to Primestar dishes for $30 from a local Directv dealer. Call around to the satellite shops, or if you see one in someones yard, ask them :-) |
08-02-2006, 05:39 PM
|  | Supporting Founder | | Supporting Founder Join Date: Sep 7th, 2003 Location: Western WV
Posts: 12,282
| | | This should be interesting. |
08-03-2006, 07:41 PM
| | DVR Addict~Mad Scientist
Topic Starter
| | Supporting Founder Join Date: Mar 16th, 2004 Location: Satsuma, AL
Posts: 6,293
| | ok, i've posted pictures (first post above).
Working with the old sony digital camera is more difficult than the project itself. |
08-14-2006, 03:33 PM
| | SatelliteGuys Freshman | | Join Date: Jan 14th, 2006
Posts: 28
| |  Converting linear lnb to circular for legacy equipment
Pepper,
Have you or Smith, P done any more experimenting with other lnb's for receiving 118 ? I would like to convert a linear lnb to circular for my legacy setup. I got a leased 622 as of two and a half weeks ago, and I would like to add AMC 16 at 118' for Indianapolis LIL when it becomes available, using my 1M Primestar dish. I have a Dual Linear lnb I was using for 105' (for guide info for Dayton,Oh. DMA), that I'm not using any more. With specs of 11.7/12.2 GHz, 950/1450 MHz, LO of 10.75 GHz, .6dB.
Also, where can I get a piece of plastic like you used ?
And will the SW64 and SW21 cascade work with a 622 ? |
08-14-2006, 04:46 PM
|  | Banned | | Join Date: Oct 4th, 2003 Location: BA, CA
Posts: 8,688
| | | That is _legacy_ type KuFSS LNBF; I wouldn't tell you if it will recognize by ViP622 without test it with SW64+SW21. So far we seen other config with a switch - DPP44. | | Thread Tools | Search this Thread | | | | | Display Modes |  Linear Mode | 
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