Registered: Posts: 569Posted Several weeks ago, I was in the process of moving the KU dish and the C dish to a concrete platform. I had everything disassembled and the dishes were.placed. in such a way that they shouldn't have moved. We had some t-storms roll through in the night with winds of 50+ mph. The next morning the C-band dish had rolled almost 20' across the yard! It didn't do too much damage but the lnbf supports got tweaked a little. I've tried to work on straightening them out.Yesterday (Tuesday 23rd) I got the dishes set up on their mounts.
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The Ku dish went up in a snap and is working great. I temporarily have it hard-mounted on 83 w (AMC 9). The C dish is giving me a few more fits of frustration and I'm thinking I need to revisit tweaking the focal point of the lnbf. I was able to find 91 w (Galaxy 17) but it only scanned in Word Network and Classic Arts Showcase; also found 95 w (Galaxy 3C), but only scanned in the mux of four lptv's.So.are there any pictures that show the actual way the lnbf should set in the scalar ring? I've got the BSC621 DMSI C/Ku LNBF.A couple months ago I purchased a Manhattan receiver from Rick and it set in the box until just now getting this stuff set up.Any/all suggestions appreciated. I almost feel like a newbie with this satellite stuff again. I've done it for several years, but have been away from tinkering with it for almost a year now.Thanks!Jim ThomasSpringfield, MissouriWS1870 1.8m w/2 C lnbf's @ 103w & 97w; Fortec Star 90cm ku lnbf @ 97w; 70cm ku w/3 lnb's @ 87w/91w/95w; 70cm ku @ 103w; all routed through x1 8x1 switch, fed to Manhattan 1933 receiver.
You will also need to purchase a Ku-band LNB and a C/Ku-band feedhorn, and have. Warpage will cause signal mis-reflection and you won't be getting the best. A weak signal could result from the feedhorn not centered, the focal length.
Registered: Posts: 1,265Posted If your arms are straightened out perfectly I believe the correct starting point is to set the dish at your true south. If your lnbf has the numbered rings on the tube like mine you have the outside of the lnb holder (side away from the dish) lined up with the number that matches the dishes f/d ratio.
Then set the skew to 3 o'clock (straight to the right).This would have you roughed in. Then you would tweak it for the best reception from there.6ft Solid w/NS741 C/KU LNBF Openbox s9, 1M Channel Master w/Avenger 321 Openbox x3, HDStar usb receiver.
Registered: Posts: 569Posted It is one of those cheapo 6'.petal. dishes (assembly required!). It will be hard-mounted, fixed on a specific satellite (no motor).
I was hoping for 101w (SES 1), but I might have a tree issue with a nasty elm tree. I talked to a buddy who cuts trees for firewood, but he isn't too interested in elm trees.takes forever to cure and won't split like most hardwood trees.Anyway, I may settle for 87w (SES 2). I hope 87w is workable with a 6' dish. I appreciate all the suggestions thus far.Added: I don't see any arrow on this particular lnbf. On the rear (the Ku part), there is stamped in the metal - 30-0-30 - with an extra line in between the 30 and 0 on each side. Currently, with the 0 pointing straight down, makes the switch block on the lnbf on the upper right side. Do I have this mounted correctly?Jim ThomasSpringfield, MissouriWS1870 1.8m w/2 C lnbf's @ 103w & 97w; Fortec Star 90cm ku lnbf @ 97w; 70cm ku w/3 lnb's @ 87w/91w/95w; 70cm ku @ 103w; all routed through x1 8x1 switch, fed to Manhattan 1933 receiver.
Registered: Posts: 569Posted Okay, this thread should now be called, 'No Signal in Springfield'To date, I have followed all directions that have been suggested. I have the lnb pushed back in the scalar ring as far as it will go without falling out, with the single nut tightened down.
The lnb is rotated so the the guide at the rear (30-0-30) shows the 0 pointing at 3 o'clock. I have triple checked that the coax is connected to the lnb out for the C band and connected to the lnb in on the receiver. I am not using the Ku on this particular lnb.
I don't plan on using the Ku for this setup, so i'm not concerned about searching for any Ku signals with it.just C band signals. So I am not using a jumper cable.its straight through from the C lnb.The other day, as mentioned previously, I randomly scanned in two different satellites. This was with the lnb adjusted so that the 0 was pointing to the 6 o'clock position and it was about 1' inside the edge of the scalar ring. It was getting late in the day (darkness approaching), so I didn't pay a lot of attention to where the dish was pointing. Now I've seemed to get the dish.lost.
from any signals. I haven't been able to find a single transponder with the described setup.My numbers are:Lat 37.2Lon 93.3Polar mount declination 5.3Southern satellite 93 degrees wI might have a tree issue with 93 w. Actually i'm looking for 87 w (SES 2), since this dish will be hardmounted (not motor to track the arc). I have attempted to have the dish pointed as far south as possible (without pointing into the tree) and slowly move it up from a low setting to a high setting and still nothing.
According to the charts, 87 w is 46.3 elevation, 169.6 azimuth.How do I determine the elevation for a C band dish? I seemed to have lost track of that. Is there anything else I'm missing? Do I have something set incorrectly?Thanks for any words of advice.Jim ThomasSpringfield, MissouriWS1870 1.8m w/2 C lnbf's @ 103w & 97w; Fortec Star 90cm ku lnbf @ 97w; 70cm ku w/3 lnb's @ 87w/91w/95w; 70cm ku @ 103w; all routed through x1 8x1 switch, fed to Manhattan 1933 receiver.
Registered: Posts: 1,265Posted Here is the elevation and skew information for 87W from your location:Latitude: 37.2090°Longitude: -93.2923°Name: 87W SES-2Distance: 37323kmElevation: 46.3°Azimuth (true): 169.7°Azimuth (magn.): 168.4°LNB Skew ?: -8.2°If there are numbered rings on your lnbf and you know the f/d ratio of your dish, set the lnbf in the holder to where the number of your f/d ratio is lined up with the outside of the lnb holder. For example I have a 6ft Sadoun with a f/d ratio of.38 so I would start with the 38 lined up with the outside of the holder.
(FYI I have about 1 inch of the lnb tube inside of the lnb holder.)6ft Solid w/NS741 C/KU LNBF Openbox s9, 1M Channel Master w/Avenger 321 Openbox x3, HDStar usb receiver. Registered: Posts: 297Posted On my 10 footer, I normally have my ns741 LNB at about 42 on the side marks. This is just a hair over 1/4 inch inside the ring and I get in the mid to high 80s on many channels on 87w. Also, just a suggestion, A good in line meter comes in handy sometimes just in case you are having trouble catching the signal.10' Sami with WSI NS741Chaparral C/KU feedhorn (Using C Band only)(backup reserve)6' Fortec C/Ku dish with a HH motor (backup reserve)4' Paraclypse Hydro with KU LNB Bracket and Invacom Universal KU LNBGeosat MicroHD receiver.
Originally Posted by mrradioheadOkay, this thread should now be called, 'No Signal in Springfield'To date, I have followed all directions that have been suggested. I have the lnb pushed back in the scalar ring as far as it will go without falling out, with the single nut tightened down.Thanks for any words of advice.The usual position for feedhorns is about 1/4 inch protrusion from the scalar ring. Because C-band SES-2 has been a difficult bird for me, I can't offer anything save the observation that setting the LNBF at an extreme position will seldom be correct.9.5', DSR922, Traxis 3500, QualiTV 1080IR, TT3200, 44.3 N, 123.3 W Rule of Acquisition 59: Free advice is seldom cheap. Registered: Posts: 6,225Posted I haven't been following this thread too carefully, and I've never owned one of those C/Ku LNBFs, so I'm not real familiar with them, other than from reading it's manual. However, a couple comments.First, I THINK that since you're not trying to get Ku, that your just using the C-band connection should be OK, but I'm not positive of how that switch is connected inside, so you might just try without and 22KHz or diseqC settings just in case it's cutting off your signal by flipping that switch.
I don't think this is the case though, as I think the switch is at the Ku connection.Second, I wouldn't worry about the F/D setting (ie the relationship between the LNBF tube and the scalar ring), until you've found a signal. The most important setting position wise is having the tube entrance at the focal length of your dish, or usually about 1/4' less than the focal length, so that the focus point is just inside the tube opening. Setting the tube relative to the scalar ring could get you way off on the focal length depending on how it connects to the support arms.I may have missed it, but I'm not sure if you've said whether you're using a signal meter to find the sat, or if you're trying to tune with the receiver.
This is actually a place where one of the cheap signal meters might come in handy, rather than one that tunes a specific transponder, at least until you've got a signal again, and then you can use either the receiver or a more sophistocated signal meter. I say this, because it sounds like at this point you aren't sure of either the FL, or the aim of the dish, or of the polarity. One of those cheap meters should be able to get you pretty close without knowledge of the polarity setting since it will respond to any signal, whether V or H. If you get an indication with the cheap meter, you can then try to find a transponder to verify what sat you're on. Once you've found a signal of any kind, then I'd try to peak the polarity by signal quality or signal strength on that transponder. One that's set, then you might try fine tuning the focal length, however if you've got the tube opening at just less than the focal length, then that should be fine for C-band.You asked 'How do I determine the elevation for a C band dish?'
This depends upon whether you have an Az/El mount or a polar mount, and the procedure is significantly different for the two mount types. I know that you said that this was going to be a fixed, single sat setup, but I'm not sure if you said what kind of mount you have the dish on. Before commenting on dish elevation, it would be best to know which type mount.
Also, the polarity/skew setting depends on the mount type. If it is an Az/El mount, then the polarity skew needs to be changed each time you go to a new satellite, and also the Azimuth and elevation.
If it is a polar mount, then the polarity skew is only set once on your true south sat (since there isn't much on the 93 sat, 91 would be OK). I'm not sure what the orientation is on your LNBF is for V and H, but you can probably get an idea by looking into the throat and viewing the probes, and they should be vertical and horizontal when on your true south sat, so it's one of two possible orientations. If you got the Classic Arts on the proper polarity before, then you're probably close to the right orientation for at your true south. If it was the wrong polarity, then you're off by 90 deg. This would have to be skewed for sats other than your true south with an Az/El mount, but isn't changed if you're using a polar mount.
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You'd also need to set your declination while on the true south sat if you have a polar mount, but there is no declination setting if using an Az/El mount.I've probably confused you more than helped, possibly because I have missed where you've explained things about your setup that I've missed. If that's the case, sorry. It just sounded like you were unsure about focal length, F/D setting, polarity, and the aim of the dish, and it didn't seem clear to me what mount type you were using, so I was trying to cover as many bases as possible. FellowMembers, your posts are welcome here! Do not worry about postingeverything perfect. Different receivers and LNB's will give youdifferent Frequencies and Symbol Rates.
Some set top boxes, PCI cardsand USB receivers, Do Not Require all of the same information thatothers may need. It is not Required to post everything that othersmay need to tune in a feed. It is just most important to share thefind. We can always adjust the Frequency and Symbol Rates and trythe various Modulations and FEC's on our own receivers until we geta 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!Thank Youfor Visiting GOFASTMOTORSPORTS.com - Keep Your Eyes on the Sky andthe Track!
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