Norsat C-Band PLL LNB - GHz ± kHz Stability F Type 75 Ohm. £ New Norsat C-Band to GHz Digital DRO LNB Freq 5 15 Ghz. If C-Band LNB Noise Figure is below 13K = Worst LNB – You will get very high signals, Your STB may skip scanning All TP. If C-Band LNB Noise. 5G Filter LNB. Local Oscillator MHz with PLL. Superior product using PLL low phase and stable Oscillator. Output frequency to MHz. MONEY ENERGY Highest score default with remote directories. With this option, media related to it is working. Find the values of x [n], then, add the.
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The LNB arrived in a reasonable time considering it had to travel across the world. No doubt there are other solutions but these suggestions may be worth considering. Primesat Single Polarity C Band feedhorn. C Band single polarity prime focus feedhorn available as feedhorn only or including a high quality block type C Band LNB. A dielectric plate is included.
This plate will convert circular polarisation to linear polarisation and so the feed can be used for either type of polarisation. An optional offset feedhorn adapter kit for offset dishes is also available. Prime Focus and Offset Dishes. Our new 1. This type of dish is circular NOT oval. It has 3 feed support arms some use 4 arms and the 3 arms converge in the centre.
Each arm is degrees apart. The feedhorn uses concentric scalar rings. The concentric scalar rings reduce noise and improve signal to noise ratio with prime focus dishes. An offset dish See below is oval and is higher than it is wide some are wider than they are high. Many offset dishes use a standard 40mm clamp LNB but some more expensive specialised offset dishes also use a feedhorn If a feedhorn is used, a c flange LNB is bolted to it. As a general rule the two types of dishes are simply two ways of doing the same job, however, an offset dish, if well engineered, usually has significantly more gain than the prime focus dish.
It is never really that simple. It is true that petalised offset dishes usually have poor gain but a one-piece well engineered prime focus dish can be better than a poorly engineered offset dish and some very good prime focus dishes can have the same gain as a good offset dish of the same size.
As usual you get what you pay for. Cheap prime focus petalised dishes are to be avoided and we don't sell them. Prime focus dishes probably look better than offset dishes as they point upwards. Update Feb. Which has the most gain? Assuming two dishes have exactly the same area, which is unlikely as dishes of the same quoted diameter are rarely the same more about that later but assuming the same area, and for the sake of this discussion the same efficiency same accurate parabolic shape, again unlikely the offset dish should produce more signal as the arms, feed support, feedhorn and lnb are not in the signal path.
However, it is never that simple. A prime focus dish produces a very precise focal point. Just like focussing the sun with a magnifying glass , the electromagnetic microwaves can be focused to a very exact well defined position into the feedhorn. In addition, any unwanted radiation, e. These rings produce destructive interference and therefore maintain a high signal to noise ratio.
The focal point on an offset dish is not as precise and the feedhorn needs to be flaired to collect the radiation. There are no scalar rings and so it is more likely that noise eg infra red from around the edges of the dish can enter the feedhorn. It is possible that this effect, improved signs to noise ratio can, to a greater or lesser extent make up for the shadows on a prime focus dish due to the feed assembly.
Some manufacturers, when they quote dish diameter, quote maximum, others quote average and some quote useable. Does the dish work all the way to the edge or is there a roll off area resulting in a much smaller useable area? Petallised dishes or dishes in several segments tend to have low efficiency as they usually do not form a very good parabola. The quality and rigidity of the feed support arms can also affect the amount of signal being received Flimsy arms may not hold the feedhorn and lnb in the exact optimum position.
It may be possible for the arms to flex to a position that gives better results but then they spring back again. Paying more for a dish usually provides a higher build quality. Petalised dishes are usually cheap and have a very disappointing performance. One piece dishes tend to work really well if manufactured by specialist companies that make quality a priority. The type of material is not really an issue.
What can be a problem is if the material is too thin. If it can be damaged or warped in transit or in high winds. The backplate needs to be very strong. Here steel is ideal and the best covering is "dipped galvanised". All bolts, nuts and u clamps should be stainless steel.
Brass is a good material for long threaded elevation adjusters. The gain of a dish should be specified at at least 3 frequencies. All prime focus dishes should use a prime focus feedhorn with scalar rings. Technically only an lnb without an integrated feedhorn e. Larger dishes have a narrower acceptance angle Whether prime focus or offset, a matched feedhorn should improve the signal to noise ratio. To summarise, there are good well engineered offset dishes and low cost mass maket offset dishes.
There are high quality prime focus dishes and some poor quality low cost petalised prime focus dishes. As usual "you get what you pay for". Which look the best? This is a matter of opinion but the prime focus dish points upwards to the satellite and looks purposeful. When domestic satellite TV started in the UK in all dishes were prime focus. The offset dish reflects the radiation downwards and so the dish face is more vertical there is an offset angle.
There is a great deal more to this subject than most people realise, hopefully this discussion clarifies some of the differences. Cost, build quality, the right matereials and good design are the key to maximum useful signal High signal to noise ratio. All prices on this web site include VAT. Links to menu pages, Catalogue Contents Page. A summary of all pages. More products. Frequently Asked Questions. FAQs Read and learn! Menu pages. Satellite receivers menu page. Fixed satellite dishes menu page.
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To buy any of these products, simply order them on this web site. Link to our own satellite museum site Satellite Museum. A museum of vintage satellite receivers. See www. Also see www. A Museum of vintage consumer electronics. Vintage reel to reel video recorders. Vintage video cameras. Vintage Laser Disc. Vintage Computers. Old telephones. Old brick mobile phones. Vintage Hi Fi, Old reel to reel audio and early audio cassette decks.
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Universal 36 Items Number of Outputs. Not Specified 37 Items Compatible Satellite Dish. For Dish Network 7 Items 7. Universal 63 Items Not Specified 98 Items Chaparral 2 Items 2. Norsat 63 Items Titanium Satellite 1 Items 1. Unbranded 8 Items 8. Not Specified 93 Items New Items Open box 4 Items 4. Used 25 Items Please provide a valid price range. Buying Format. All Listings.
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Authenticity Guarantee. More filters Condition Any Condition. Full-band 3. Flange-type LNA. NJS series Product Notes. Frequency Organization RF Frequency: 3. Model No. Technical Support. Product Notes 1 While we continually strive to improve the quality and reliability of our products, failures will occur in microwave products over time.
Customers must pay careful attention to ensuring the safety of their equipment. Do not use under conditions that deviate from the product specifications included in the delivery specifications. We assume no responsibility and shall not be liable for any injuries, accidents, or social repercussions resulting from the product being in a poor or damaged state because it was used under conditions that depart from the specifications.
In the event of a failure for which we are responsible occurring during the warranty period, we undertake to repair or replace the product free of charge. Note, however, that the warranty does not cover failures such as those listed here see bullets below , even if they occur within the warranty period. In addition, in the case of a product being repaired or replaced by us, the starting date for the warranty period is still the original delivery date of the product.
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Failure due to the product being used in conditions other than those stipulated in the data sheet, specification sheet, etc. It does not cover secondary damage to equipment, business opportunities, profits, etc. Since it can be damaged by the intrusion of water, dust, oil, chemicals, etc.
Also, be sure to use connectors and waveguides properly. If replacement parts such as fans are included, proper maintenance is necessary. To maintain product performance and functionality, it is necessary to conduct inspections and maintenance at appropriate intervals and exchange replacement parts when necessary.
Improper inspections or maintenance may result in failure. In addition, the warranty does not cover the use of the product in areas where salt damage can be expected or where there is a substantial presence of corrosive gases such as Cl2, H2S, SO2, and NO2. If the product is to be used in such areas, at the time of installation you must take appropriate steps to protect the product.
To avoid danger, do not incinerate, crush, or chemically treat the product in such a way that gases or dust are released. When disposing of the product, comply with all applicable laws and regulations and do not treat it as general industrial waste or household waste. We request that you do not use our products or the technical data published on this website for developing weapons of mass destruction or for any other military purposes or applications.
If you are considering using a product, delivery specifications must first be settled. Since being consumer products these LNBs provide only moderate frequency accuracy and stability. Below we will describe how to modify these LNBs to achieve superior accuracy and stability with relatively little effort. These LNBs are availble in single or dual channel in narrowband 3. Yes, some screws are missing and the holes are going through to the feed, which will allow moisture to enter the LNB!
Better to buy this one since it has all screws in place! The resulting IF range is between and MHz. Please note, the high LO design inverts the baseband, so you have to swap the I and Q signals before further processing. In the picture below we see how the moderate frequency accuracy of the cheap crystal results in a carrier offset of almost 70 kHz. Now with 25MHz reference after the hardware mod. Now the carrier appears exactly where we would expect it. For comparison: in the picture below only a cheap PLL frequency multiplier was used, so you can clearly see the effect of the bad phase noise of the reference also having a huge impact on the noise floor around the signal of interest.
The modification comes down to removing the stock crystal and feed 25 MHz from a stable frequency source into the LNB. The proposed approach is using a simple narrow bandpass made of a series capacitor and inductor. Any other reasonably selected value pairs which are resonant at 25 MHz might be used as well. Carefully remove the crystal without destroying the PCB pads.
Proceed as shown on the picture below. With this modification, experiments have shown that reference level must be maintained between to 10 dBm for best SNR. Best reference level appears to be around dBm. Let's take a look inside.
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