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transponderman

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Reply with quote  #1 
Dilemma,,,i have a 20 degree c band LNB,,,if i want a wideband example 3700-4800 lnb  the temp climbs to 45 K,,,,,i have a 12 ft dish   will i lose lots of channels or just minimal loss,,,if i chose a 4500-4800 lnb  the temp stays at 20K,,i could piggy back but the complexity of it all,,,,i like simple  1 c band  1 ku band LNB,,,less switching....if you were in my position,I CAN MOVE MY DISH FROM 135 w -0.08 west  LOTS of international freq's  WHAT WOULD BE A MORE LOGICAL CHOICE without losing many transponders?
boblop

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Reply with quote  #2 
Yet another point to ponder when dreaming of finding all the weak and strong tps at those higher freq range is what are you using for a feed wave guide? (4500-4800) A wave guide has a bandpass freq range and if you get outside of those freqs then signal loss can happen.  I was reminded of this as I researched my Seavey C band motorized feed horn. There were three models made of my unit which covered 3.4 to 4.2 and 3.7 to 4.2 which I have plus a 4.2 to 4.8 model also. They also made 4 different models to cover that many different ranges of F/D  Ratio dishes. If you wish to be able to receive all the weaker tps then you want to keep in mind "all" of the design features which will bring in those weaker signals. There is more to this dilemma than just the best LNB choice.

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transponderman

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Reply with quote  #3 
any norsat recommended LNB to do this? i do not want to piggyback my lnb's,,seems it gets detailed,,,if i use a 3700-4800 with minimal temp loss  i am wide open to a perferred model and make,,,
boblop

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Reply with quote  #4 
The short answer is to just buy more and more stuff. A serious hobby person has a lot of stuff. As hobby folks we may get by with some what lesser parts but if you want all of the weaker then better quality is the way forward. For me the hobby is about watching some of this video rather than just collecting the most different tps locks or finds.
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Captain_Kurtz

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Reply with quote  #5 
Quote:
any norsat recommended LNB to do this? i do not want to piggyback my lnb's,,seems it gets detailed,,,if i use a 3700-4800 with minimal temp loss


AFAIK, There is only *one* LNB available that covers the entire 3700-4800MHz (again, it's actually 3625-4800), and it's the Norsat 8000RI.
The only choices are 50ohm N connector or 75ohm F connector.

I did not have any problems with losses with the feedhorn not being compatible with 4500-4800. Keep in mind that the higher the frequency, the shorter the wavelength - and shorter wavelengths have zero problem fitting into the feedhorn - same reason Ku fits into a dual C/Ku feedhorn. Sure, the feedhorn isn't specifically tuned for 4500-4800, but it's close enough and the signals strong enough that it worked very well. I did use the straight-through port of a Chaparral orthomode feedhorn to minimize any losses just in case.

As for "noise temperature" sure it's important - but what is *really* important for locking digital is "phase noise", even more important than L.O. stability from a PLL LNB unless you are trying to lock really low SRs. Of course a good LNB can be a PLL model and have very low phase noise also. The consensus seems to be that the Norsat 5150 that Rick sells here (at a really good price) is an excellent all-around choice for us FTA hobbyists, and I completely agree. Only 15° of noise temperature, and -65dBc/Hz of phase noise at a 1kHz offset, dropping to -95dBc/Hz at 100kHz (lower is better). It has a PLL L.O. with +/-150kHz stability, much more than good enough for any video or even audio feeds, AFAIK.

http://www.rickssatelliteusa.com/rickssatellitelnblnbf.htm

I also like the NJR LNBs, but haven't done a head-to-head comparison.

Put two Norsat 5150Fs on a good orthomode feedhorn and you're golden.
The Norsat 8000RI is cool technology, but I wouldn't want it on my dish full time.
It might eventually end up on a second or third dish.


Quote:
The short answer is to just buy more and more stuff. A serious hobby person has a lot of stuff.


This is the correct answer.

transponderman

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Posts: 193
Reply with quote  #6 
the one i found was the c band pll 3.6-4.8 and it is phase lock looped  norsat 45 k   recommended by the norsat people
Captain_Kurtz

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Posts: 3,941
Reply with quote  #7 
The only LNB on their website that covers 3625-4800 is the 8000RI, and it's +/-500kHz DRO, not PLL, and the stated noise figure is 35K not 45K, and the only two options are N connector or F connector. Maybe they are going to introduce a PLL version, but I don't see it listed.

https://products.norsat.com/Catalog/SATELLITE-COMPONENTS/LNB

Again, it's very cool technology, but also very much a compromise design.
It was a lot of fun pulling in an extra handful of channels including an awesome 4K demo channel,
but unless you speak Spanish or Brazilian Portuguese, I would stick with the Norsat 5150 (that Rick sells) for everyday use.
transponderman

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Posts: 193
Reply with quote  #8 
i love foreign broadcast  because of sports    if i wasn't a sports fan i would not care to find as much up there as i attempt to do.....for me the most bandwidth c band//ku band   is a no brainer, will do this change over this spring   CAN'T WAIT,,,if i was not a sports fan and only want american broadcast   THIS IS A WASTE OF $$$  absolutely,,,,for any domestic products to receive 135 west to 81 west   RICK'S products are 2nd to none....thank god FOR A GOOD MAN LIKE HIM always honest since day 1...
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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a 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!

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