Trying to do this the other way around however will not work as an LNB with a 40mm collar will not fit a 38mm collar holder. While this is not the end of the world when fitting a 38mm collar to a satellite dish which accepts a 40mm collar as a couple of wraps can around the collar can be enough to build the gap and create a secure fixing so that the LNB skew can be set correctly. As many don’t fit, like universal LNB’s used for Sky and Freesat MK4 style satellite dishes have a 38mm collar and nearly all other satellites dishes use an LNB with a 40mm collar. There are lots of different types of “universal LNB” and contrary to as it sounds not all LNB’s are universal with all satellite dishes. Most LNB’s, but not all of the oscillate the signal down to the satellite intermediate frequency band which is between 950Mhz to 2150Mhz. Each different type of LNB works in it’s own way but one of the main functions is to take the amplify the satellite broadcast signal and oscillate the signal to a lower frequency band that the coaxial cable can contain without excessively cable losses and the higher the frequency the greater the cable resistance and the quicker you will lose signal down the cable length. The LNB, which stands for Low Noise Block is the attachment at the end of the satellite dish in which the coaxial cables that feed your satellite receiver connect to.
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