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Callisto

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Elevation or declination? Pulling on centre of dish brings in weak signals. Elevation setting seems to have little effect. Dish could possibly be warped. Will lowering the dish slightly make up for this problem?
photoman76

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Quote:
Originally Posted by Callisto
Elevation or declination? Pulling on centre of dish brings in weak signals. Elevation setting seems to have little effect. Dish could possibly be warped. Will lowering the dish slightly make up for this problem?


What is your southern most satellite and where is the dish pointed when you are pulling down on the dish?
Callisto

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Originally Posted by photoman76


What is your southern most satellite and where is the dish pointed when you are pulling down on the dish?
SES11 southern most and SES3 pulling down on dish.
photoman76

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I would adjust the elevation to maximize the signal quality of the weak signal since you are at the top of the arc.
wejones

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Quote:
Originally Posted by Callisto
Elevation or declination? Pulling on centre of dish brings in weak signals. Elevation setting seems to have little effect. Dish could possibly be warped. Will lowering the dish slightly make up for this problem?

Doing the pull down/push up test doesn't tell you much of anything if only done at one point. You need at least east and west extremes and south sat, and even then it can be a combination of elevation, declination, azimuth and focal point. There are also senarios where doing test on Ku gives different results than if done on C-band.
boblop

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Reply with quote  #6 
dish could be warped-----

Perhaps a better tuning method would be because a car is a mobile device to drive out in the yard where the dish is with the car and via a rope tied between the car and the dish then drive the car around until you get the best sat signal strength. Of course with this dish alignment method you may have to move the car for each different sat desired position!

wejones summed up the issue very well----

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majortom

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Reply with quote  #7 
Sounds like he had made some progress last summer testing various Points in the arc.
I wonder of the ones u captured so far, situation remains same today? and were u able to capture
any more points since?

https://rickcaylor.websitetoolbox.com/post/pulling-down-on-dish-brings-in-weak-channels-10177709?&trail=30

Totally agree with Kermit, if we were only closer I am sure there are at least a dozen guys who would offer to help a guy...

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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.
DB8E/VHF Yagi rotor FM Bandstop ap-8700 preamp 8way split LG lcd.
ricardo's geo-orbit archive: https://web.archive.org/web/20071202191450/http://www.geo-orbit.org:80/sizepgs/tuningp2.html

GFM

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Reply with quote  #8 
I set my 10' movable dish so I get maximum signal when I push down on the bottom maybe an LB or two so I don't have to go out and clean the dish during a snowstorm. 😉  😉
Problem is I installed the dish with the mast that came with it, a 4" sch 40 pipe about 6' long with bracing at the bottom. After the installation I found the mast wasn't heavy enough and bends toword the direction the dish is facing by maybe a 1/10th of a degree or so, making it difficult to fine-tune. It works fine most of the time if I compensate for the bend by increasing the elevation just a bit, but when the dish is centred (looking at most southern satellites) it is a bit too much and a bit of weight on the bottom brings the signals up a couple tenths of a dB or so. Opposite at ether end of the arc.
I have a 6' 6" sch 40 pipe ready to go with a 4" heavy pipe welded to the end... just haven't found the time, and now we had our first snowstorm we have 14" snow everywhere now so might have to be next year.
Anyway... just thinking this might be your problem as well possibly? I see lots of 3" and even smaller masts on large C-band satellite dishes, expecting troubles like that with those for sure! Longer the mast the more moment pressure on the mast at the bottom, = more bend...

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