Nice! I just ordered today..since my invacom is pretty heavy for my cheap dish..lol
I'll let you know how it works for me..
5 LNB Test on 4' Dish
- Thread starter Costactc
- Start date
Nice! I just ordered today..since my invacom is pretty heavy for my cheap dish..lol
I'll let you know how it works for me..
You won't regret it my friend, it's a solid feed and giving me excellent results across the arc. I'd invest in another for my side feed on the 8' solid but I have too many.
Should be about a week and half I would guess to get here..35 cnd with shipping..if it's very good I may have a contact to get them cheaper and possibly pop some in the store.
It took almost 2 weeks to get here as well. These lnbs would be an excellent addition to the store if you could buy in bulk because shipping basically doubles the price. I also noticed that most avid dxers in Europe are using them.
Can't go wrong Rob.
IMO, probably all of the lnbs mentioned in this thread are good or decent lnbs. The prime focus lnbs should be used for that style of dish.
What works good or the best for one dish may not perform as well on another brand or type of dish. These ku lnbs have a set, non-adjustable feedhorn so you cannot adjust the focal distance like you can on most c band lnbs. This adjustment is not as critical at ku band frequencies, but it would help to have this adjustment for fine tuning ku lnbs.
Sliding a long neck lnb up and down in the lnb feed holder Does Not adjust the focal distance on a lnb with a fixed scalar ring.
On a 1.2 meter dish, a larger diameter feedhorn seems to work a bit better than any of the small feedhorn lnbs mentioned in this thread. I am running a 1.2 meter offset for ku and I think all of the lnbs mentioned here were not really designed for that size of dish. I suspect they were designed for the 65 to 80cm dishes, and that is why they have a smaller feedhorn.
The difference between my best small feedhorn lnbs and the larger feedhorn lnb is a db or two in SNR. All that signal increase gives me is some weaker transponders in clear weather.
The SNR difference between my 1.2 and 1.8 meter dishes with the best lnbs I have for them installed is 1 to 3 db, depending on where and what the signal is. Overall, the 1.8 meter dish performs a slight bit better than the 1.2 meter dish, and this is to be expected.
The 1.8 meter dish stops receiving ku signals at almost identical time to the 1.2 meter dish in heavy rain,and the 1.8 meter dish only gets a couple of transponders that the 1.2 meter cannot get. This is why I do not get too excited when I see tests of one lnb outperforming another lnb by 1 or 2 db in SNR. Granted, it is always best to know which lnb performs the best on a given dish, but a gain of 1 or 2 db in SNR will go unnoticed on most signals that are up there. For Dxing, and scanning, it helps to have every bit of extra signal strength that you can get! But for watching tv on a strong or moderately weak transponders, a gain of 1 or 2 db in SNR will go mostly unnoticed. EB
What works good or the best for one dish may not perform as well on another brand or type of dish. These ku lnbs have a set, non-adjustable feedhorn so you cannot adjust the focal distance like you can on most c band lnbs. This adjustment is not as critical at ku band frequencies, but it would help to have this adjustment for fine tuning ku lnbs.
Sliding a long neck lnb up and down in the lnb feed holder Does Not adjust the focal distance on a lnb with a fixed scalar ring.
On a 1.2 meter dish, a larger diameter feedhorn seems to work a bit better than any of the small feedhorn lnbs mentioned in this thread. I am running a 1.2 meter offset for ku and I think all of the lnbs mentioned here were not really designed for that size of dish. I suspect they were designed for the 65 to 80cm dishes, and that is why they have a smaller feedhorn.
The difference between my best small feedhorn lnbs and the larger feedhorn lnb is a db or two in SNR. All that signal increase gives me is some weaker transponders in clear weather.
The SNR difference between my 1.2 and 1.8 meter dishes with the best lnbs I have for them installed is 1 to 3 db, depending on where and what the signal is. Overall, the 1.8 meter dish performs a slight bit better than the 1.2 meter dish, and this is to be expected.
The 1.8 meter dish stops receiving ku signals at almost identical time to the 1.2 meter dish in heavy rain,and the 1.8 meter dish only gets a couple of transponders that the 1.2 meter cannot get. This is why I do not get too excited when I see tests of one lnb outperforming another lnb by 1 or 2 db in SNR. Granted, it is always best to know which lnb performs the best on a given dish, but a gain of 1 or 2 db in SNR will go unnoticed on most signals that are up there. For Dxing, and scanning, it helps to have every bit of extra signal strength that you can get! But for watching tv on a strong or moderately weak transponders, a gain of 1 or 2 db in SNR will go mostly unnoticed. EB
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I would suggest trying a Raven Feedhorn to get the maximum out of a 1.2 meter dish. You should already have a lnb that will work with it
http://www.legitfta.com/forum/showt...From-Your-Antenna-System-nbsp-(1-Participant)
http://www.legitfta.com/forum/showt...From-Your-Antenna-System-nbsp-(1-Participant)
Aren't those feedhorns normally used for prime focus dishes rather then offset?
I had a look at the UK sat store for offset feedhorns. Ouch...60 pounds plus shipping. I have the invacom twf-031 flange which would work with that type of feedhorn. What do you think of the Gibertini feedhorn, which is a bit less costly:
http://www.ebay.com/itm/Gibertini-C...und_Vision_Satellite_LNBs&hash=item4d1f682cfe
http://www.ebay.com/itm/Gibertini-C...und_Vision_Satellite_LNBs&hash=item4d1f682cfe
I found a thread from a forum across the pond where a member was using the raven feedhorn and tested it out against a gibertini and ended up slapping a black inverto ultra on his 1.5m dish with better results:
This is a follow on from a discussion on the old forum about the best setup for a Gibertini op-150 dish. I have been using a Andrews/Raven feedhorn to good effect but a contributor, Caz, reckoned he got a better result with the Gibertini feedhorn which is designed for the dish. I went ahead a bought the latter on e-bay and yesterday I tried it. It’s hard to quantify (-0.1/2 db on strenth) but I’d say the result were the same or slightly worse on 2F signals (C5 and C4 HD).
I changed back to the Andrews feedhorn and it was definitely slightly better for me. However, a couple of weeks ago I changed back to the Inverto Black Ultra single and got a massive 1 db increase in signal strength
I have the inverto on my 1.2m dish and just wonder if a feedhorn anad its expense is actually worth it.
This is a follow on from a discussion on the old forum about the best setup for a Gibertini op-150 dish. I have been using a Andrews/Raven feedhorn to good effect but a contributor, Caz, reckoned he got a better result with the Gibertini feedhorn which is designed for the dish. I went ahead a bought the latter on e-bay and yesterday I tried it. It’s hard to quantify (-0.1/2 db on strenth) but I’d say the result were the same or slightly worse on 2F signals (C5 and C4 HD).
I changed back to the Andrews feedhorn and it was definitely slightly better for me. However, a couple of weeks ago I changed back to the Inverto Black Ultra single and got a massive 1 db increase in signal strength
I have the inverto on my 1.2m dish and just wonder if a feedhorn anad its expense is actually worth it.
I have not tested the Gibertini, but I would expect similar results as the Raven from it.
I do not regret buying the Raven piece though. I have an Invacom behind the Raven, and do not worry about testing lnbs for Ku anymore because I know there is precious little if anything at all to gain.
I do not regret buying the Raven piece though. I have an Invacom behind the Raven, and do not worry about testing lnbs for Ku anymore because I know there is precious little if anything at all to gain.
A very good question and you will have to pay to find the answer to it. Also, like I said earlier, an increase of 1db in SNR will not do much if anything for you except on the extreme weakest signals. You and i both haave purchased and tried many different ku lnbs. I have found what I consider to be the maximum combination for my 1.2 meter dish, and I do not plan to buy anymore test lnbs for it. If I need more signal, then I will get a much bigger dish.
Depends on what you are wanting to do. There is not much use for the universal lnb above 61 West unless you can receive 78 West. I have seen universal transponders at 116.8 west before, but that did not last long. I am located close to the East Coast of the U.S. so I can get some of the Atlantic satellites. IMO, it is better to have an universal type lnb and not need it than to miss something. You can run an universal with a 10600 l.o. setting if you turn 22KHz On. using the 10600 and 22KHz On setting will give you very similar results in scan speed as compared to a standard lnb with a 10750 l.o. setting.
West of 30w there are only 3 open channels that require a universal lnb(2 at 45w and 1 at 50w) and of course on Simon Bolivar at 78w. I always like to make sure to be able to scan everything possible in, whether I watch it or not.
I bit the bullet and ordered the Gibertini feedhorn which will be used with my invacom twf-031 lnbf, I will be using the black inverto on my new 90cm dish install that will be attached to my 10' bud pole:
This is the Gibertini C120 Feed horn for offset focus dishes
Made by Gibertini but will fit all dishes C120 LNB's give better resistance to cross polarity interference and therefore can perform better than a standard LNB
- FAQ -
The Gibertini dishes f/D is 0.67 - but if the f/D ratio of your Prime focus or offset dish is between 0.6 and 0.7 then this feedhorn is the right shape to give optimum performance
Using this Feedhorn with your Gibertini OP125 or OP150 you will get optimum performance from all components the LNB and the dish surface and this combination will give you better performancce than virtually any alternative
In addition when you buy and use Gibertini Dishes you are buying durability - because Gibertini dishes are precision made from materials which do not alter in any measurable way over a 10 year period
http://www.hisat.com/proddetail.php?prod=LNBC120FEEDHORN
This is the Gibertini C120 Feed horn for offset focus dishes
Made by Gibertini but will fit all dishes C120 LNB's give better resistance to cross polarity interference and therefore can perform better than a standard LNB
- FAQ -
The Gibertini dishes f/D is 0.67 - but if the f/D ratio of your Prime focus or offset dish is between 0.6 and 0.7 then this feedhorn is the right shape to give optimum performance
Using this Feedhorn with your Gibertini OP125 or OP150 you will get optimum performance from all components the LNB and the dish surface and this combination will give you better performancce than virtually any alternative
In addition when you buy and use Gibertini Dishes you are buying durability - because Gibertini dishes are precision made from materials which do not alter in any measurable way over a 10 year period
http://www.hisat.com/proddetail.php?prod=LNBC120FEEDHORN
We are both located in Cornwall so 34w is completely out of our range on ku.