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Pops

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Reply with quote  #16 
Quote:
No you never adjust the declination but one time, the time you install the dish . . . 

Curious about something . . . 
I did not do the initial install of my 10-ft. mesh, but did do some elevation adjustments last summer on 103 west and went from about 75% quality on NBC feeds to 88%.  I was patting myself on the back until I realized recently that I lost a fair amount of signal at 78 west.  All other birds SEEM as good as ever.  

To peak my entire arc, is the next step to check southern-most satellite and adjust elevation, then check eastern and western-most satellites to see if they are coming in as strong as possible?  If the eastern and western birds are not coming in as they should, does that mean I have a declination issue? 

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"My neighbors to the east cut down their weeping willow and now there's barely anything to watch between 85° and 72° !"
Captain_Kurtz

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Reply with quote  #17 

Pops, can't find the link, so going from memory:

Once you have your dish peaked on your southernmost satellite:

If you are overshooting the satellites at both ends of the arc, then you don't have enough declination.

If you are undershooting the satellites at both ends of the arc, then you have too much declination.

If you are overshooting the satellite at the east end of the arc, and undershooting the satellite at the west end of the arc,
then you need to rotate the mount towards the west. (adjust azimuth towards the west)

If you are overshooting the satellite at the west end of the arc, and undershooting the satellite at the east end of the arc,
then you need to rotate the mount towards the east. (adjust azimuth towards the east)

("Overshooting" means that the elevation is too high, and "undershooting" means that the elevation is too low.)

HTH

Also, if you do need to adjust declination, then you will also need to adjust elevation again to compensate while on your southernmost satellite to re-peak it, then go check the east and west ends again. Repeat until you are tracking perfectly.


Captain_Kurtz

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Reply with quote  #18 
Not the link that I was looking for, but the bottom three illustrations on this page explain it:

http://www.repentnow.com/FTAMOTORINSTALL.htm

Some people like to use an angle finder to set the declination angle once, then forget about it,
but that relies upon the accuracy of your angle finder and your measurement.

I prefer to roughly set the declination, then adjust using what actually matters - signal level.

Pops

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Reply with quote  #19 
Thanks for providing that info Captain K.  Hopefully I understand enough to take a crack at realignment when the weather warms up.  
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"My neighbors to the east cut down their weeping willow and now there's barely anything to watch between 85° and 72° !"
Jim

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Reply with quote  #20 
Quote:
Originally Posted by Pops
Quote:
No you never adjust the declination but one time, the time you install the dish . . . 

Curious about something . . . 
I did not do the initial install of my 10-ft. mesh, but did do some elevation adjustments last summer on 103 west and went from about 75% quality on NBC feeds to 88%.  I was patting myself on the back until I realized recently that I lost a fair amount of signal at 78 west.  All other birds SEEM as good as ever.  

To peak my entire arc, is the next step to check southern-most satellite and adjust elevation, then check eastern and western-most satellites to see if they are coming in as strong as possible?  If the eastern and western birds are not coming in as they should, does that mean I have a declination issue? 


Here's a link Pops that might be helpful

https://web.archive.org/web/20071202191450/http://www.geo-orbit.org:80/sizepgs/tuningp4.html#anchor805243
Captain_Kurtz

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Reply with quote  #21 
Thanks Jim - that's exactly the page that I was looking for.
Only available on web archive now? I will have to download a copy before it's gone.
Pops, no problem and if you have any questions just ask here.
Is 78W your easternmost satellite?
You're on the west coast?
Linear actuator, or H-H mount?
Do you remember if you increased, or decreased elevation to improve the signal at 103W?
a33

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Reply with quote  #22 
Quote:
Originally Posted by Captain_Kurtz
Thanks Jim - that's exactly the page that I was looking for.


Also the modified motor angles chart is there: https://web.archive.org/web/20071117180836/http://www.geo-orbit.org/sizepgs/decchartp.html
I would always use that as starting point.
(But of course the declination value at latitude 65 is wrong ~ but maybe in your case not relevant.)

greetz,
A33
majortom

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Reply with quote  #23 
Quote:
Originally Posted by Captain_Kurtz

Only available on web archive now? I will have to download a copy before it's gone.

that is why it's in my signature...
if webarchive ever disappears, I already have an archive of every page, with images and all.
Can easily be copied to anyone's web server.


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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

conway

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Reply with quote  #24 
thanks for all of your info here.. I got my dish dialed in Perfect for Cband.. Ku is coming in okay but not great.. ON the next warm day i'll dial in the KU. On 91 West one of the C band channels had a signal of 21.5db.. Abc news KU has 11db.  Very good!
Pops

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Reply with quote  #25 
From Captain Kurtz:
Quote:
Pops, no problem and if you have any questions just ask here.
Is 78W your easternmost satellite?
You're on the west coast?
Linear actuator, or H-H mount?
Do you remember if you increased, or decreased elevation to improve the signal at 103W?

Captain, I'm sure I will have questions.  Answers to yours:
1) I have gotten 72 west in the past, before adjusting elevation.  Now there's nothing at 72 west to scan in, right (except for data)?  
2) I have a linear actuator
3) I raised the elevation angle of the dish while on 103 west

Sat Mount 2.jpg 


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"My neighbors to the east cut down their weeping willow and now there's barely anything to watch between 85° and 72° !"
Captain_Kurtz

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Reply with quote  #26 
Pops -
It's likely that you will have to decrease declination to compensate for raising elevation.
Always do declination and elevation adjustments while on your southernmost satellite.
Also measure the declination angle with an angle finder; it should agree with the number in the declination chart for your latitude,
to within the accuracy of your measurement. I still would tweak the declination using a signal meter.
The reason I asked about your range of satellites, (72-139) and whether you have an actuator or H-H motor, is in my experience in practice it can be difficult to distinguish between the different cases (too much / too little declination, elevation, azimuth), if you don't have a satellite all the way east and a satellite all the way west.
Your westernmost satellite at 139 is fairly high in the sky, well above the horizon for you, correct?
Once you are peaked on your southernmost satellite, then tracking errors are subtle near the top of the arc, and large at each end.
So you need to be very careful and precise when measuring the signal from 139 and making adjustments, because your adjustments will have a much larger effect on your reception from 72W than from 139W. I hope I explained this clearly.
Best advice is to try azimuth adjustments first, then elevation / declination if necessary.
If you study those charts, it should make sense.
Nice dish BTW.
Pops

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Reply with quote  #27 
You can tell what dish I have, huh?  Glad to know it's a good one.  I know it's more solid than the previous one that kept getting panels blown out by the wind.  

So the first step for me is to get an angle finder/inclinometer, yes?  I won't attempt any changes for probably a few months, so I'll probably have lots of questions then.  

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"My neighbors to the east cut down their weeping willow and now there's barely anything to watch between 85° and 72° !"
bigdish3

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Reply with quote  #28 
So Conway what happen were you able to tune the dish? If you are  getting strong C band signal and very low  signal or no signal on KU might not be your dish. What type of  Ku LNB are you using?Is your feed horn very old? I had a corotor II that died on me and would not get any Ku signal I replace it and got great Ku signal could rusted inside out.
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Big Dish for the pass 30 yrs  10 Orbitron  Uniden receiver link box 8000 Octagon SX-88 Octagon SF8008 UHD
 
conway

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Reply with quote  #29 
Yes i am thinking it's my LNB. It's a universal C/Ku lnb.. it's a good 2 years old. It's the Pro Broadband LNB that you get from tek2000. 91 W i get 11db on the ABC news feeds and 10.5db on PBS on 125W.. can't even pull in NBC KU on 103W.. i used to get those at 16db then one day Poof they gone. I'm looking around for a new LNB now to replace it. I'm thinking about getting a new bracket to hold a dedicated KU lnb and a separate C Band LNB..i think that route will be better than the combo unit. 
Mike

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Reply with quote  #30 
Quote:
Originally Posted by conway
Yes i am thinking it's my LNB. It's a universal C/Ku lnb.. it's a good 2 years old. It's the Pro Broadband LNB that you get from tek2000. 91 W i get 11db on the ABC news feeds and 10.5db on PBS on 125W.. can't even pull in NBC KU on 103W.. i used to get those at 16db then one day Poof they gone. I'm looking around for a new LNB now to replace it. I'm thinking about getting a new bracket to hold a dedicated KU lnb and a separate C Band LNB..i think that route will be better than the combo unit. 


I switched to a chap feedhorn and ran wires from the servo to the uniden for that reason. I was losing signals on Cband more than ku.
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