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Thread: Focus point of 90cm dish?
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- 05-21-2010 10:46 AM #1
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Focus point of 90cm dish?
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I've had the Azure Shine Geosat dish in service for 3 months. Initially lined up just fine with Q65 on 97° and 101° . But now over time I was down to Q45-49. After re-peaking the dish with no improvement I tried moving the lnb's in toward the dish about 3/4" and it improved to Q59 and is watchable again. Wonder what is going on here and will it get worse?
JimLast edited by Pixl; 05-21-2010 at 11:58 AM.
- 05-21-2010 10:46 AM # ADS
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- 05-21-2010 03:09 PM #2
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I would do a string test on the dish and make sure it has not warpped in the wind or the temp. change. Other than that, is this change on all trandponders on both satellites? If not on all, it may be a change in the birds.
Keep us posted.
POPHome base is 20 acres near N45.85 W120.58.
Lots of room for Ham Antennas HF, 2M and .75M and Satellite Dishes
Mercury II , -Fortec Star 5400-NA; Coolsat 6000; GeoSat DVR1100c ; 10 C-Band analog receivers - untested.
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1.2M to rebuild and test then use if I can
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- 05-21-2010 03:10 PM #3
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Proud Staff MemberThe LNB's should be pushed in about 3/4" towards the dish for optimum signal quality
Winegard 76cm dish, SG2100 motor, Sadoun dual KU LNB..... Directv Slimline SWM 3 LNB.... GeoSatPro 36" dish with Sadoun dual KU LNB... Coolsat 5000 on motorized.... Manhattan RS1933....Directv HR34 (yes the 5 tuner monster) GeoSatPro 200 to aim dishes.... few receivers not set up yet
Two 6 foot Fortec dish with GeoSatPro dual C-Band LNB "ghetto moved" to various C-Band satellites
- 05-21-2010 07:32 PM #4
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Ice,
I'm finding what you say is true to the real world. The instructions that came with my Glorystar package clearly say to push the lnb's against the front stop collar with illustrations showing this. Worked ok first month or so??
Jim
- 05-22-2010 12:10 AM #5
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The Glorystar installation guide for the DSR100c / DSR200c and DVR1100c receivers provide instruction for the initial LNBF setting: placing the face of the LNBF 3/4" forward of the dual bracket toward the reflector.
Originally Posted by TantalusFld
The final fine tuning step of the install process suggests individually sliding the LNBFs towards or away from the reflector and/or individually slightly skewing the LNBFs to peak the Signal Quality readings. The optimized LNBF placement will be dependent on the installation location longitude and latitude.
We hope that this clarifies the correct placement of the LNBFs in the dual LNBF bracket.
- 05-22-2010 07:39 AM #6
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Funny thing. I just re-checked my manual and found someone snuck into my house and switched it with a copy that says 3/4". Imagine that!
Thanks guys.
Jim
- 05-24-2010 01:53 PM #7
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LOL!!! Originally Posted by TantalusFld 
- 06-01-2010 09:44 AM #8
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someone did that to me too! FTA GNOMES! Originally Posted by TantalusFld
i think i read a post somewhere that told me to push it up against the collar as well and i just skipped over that part of the manual. when i tried peaking my dish i found that the opposite was true and i, in fact got the best quality reading when i slid it back 3/4".
- 06-02-2010 07:55 PM #9
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Ah ha, my mistake has helped others. I don't feel so bad now. This message board and the people in it are great!
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