i don't know how to change lnb frequency i looked through all the menus i wasn't able to find it i only found tp frequency.
Pavel,
Hello and good day!!
First, do you understand the difference between the LNBF frequency and the TP frequency? They are two very distinct things. If you were not sure, you will need to become familiar in order to understand what setting you are looking for in your Traxis. Bare with me if you already understand the electronics part of this and were simply trying to locate the specific menu to ensure it was set correctly. I will explain it as if you don't know for the benefit of other members who are new and may not understand.
The TP (or tansponder) frequency is the transmission frequency coming down from the satellite. You have no control over this frequency, obviously, as it is set by the satellite owner. For a typical linear (North American) satellite, the frequency will fall in the range of 11.700 GHz and 12.200 GHz, but it isn't limited to this range. But, you can accept that this as most common.
The LNBF frequency is the frequency of an internal oscillator within the LNBF unit. You have no control over this either, it is set by the manufacturer of the particular LNBF that you purchase and install. This oscillator is called the "Local Oscillator" or the L.O. for short. This frequency is typically 5250 for C-Band and 10750 for Ku band.
The incoming TP frequency gets mixed with the frequency of the L.O. and produces a much lower "difference" frequency (the L-Band frequency). This frequency is low enough that we can use inexpensive cable to route the signal into the house and into the receiver without degrading the signal too much. If we didn't "down-convert" the TP frequency to the lower L-Band frequency, we would have to buy million dollar cables!
Now, when we speak of the LNB or LNBF frequency or L.O. frequency, we are referring to the frequency of this Local Oscillator within the LNBF unit. As I mentioned, this frequency is SET and FIXED by the manufacturer of the LNB. Just like the TP frequency is set and fixed by the satellite owner.
When you buy a new LNBF to attach to your FTA system, you have to know what type you are buying first. If you want to receive C-Band signals, you need to purchase a C-Band LNB (or LNA). If you want to receive Ku band signals, you have to buy a LNBF that supports Ku band signals. That is logical to get the right equipment for the job.
However, you must inform the receiver what you actually bought. The reciever is a dumb box otherwise. So you have to find the setting that tells your receiver that your LNBF (LNB or LNA) has a local oscillator frequency of "XXXXX" Mhz / Ghz. When you have it set right, then your receiver will understand which L-Band frequency to look for as the incoming signal. Then the tuner may process the signal properly.
So, you need to look for something in your menu that refers to the L.O. frequency, LNB frequency or LNB Type. Since I don't have experience with the Traxis, I don't know where that menu is or what they use for the terminology.
Basically, the process is just simple math. The difference between the L.O. frequency and the TP frequency becomes the L-Band frequency and that is what the receiver is looking for. So, if the TP frequency is 11700 and the L.O. frequency is 10750, then the L-Band frequency is 950. But, if in your menus you have told the receiver that the L.O. frequency is 10600, then the receiver will be searching for an incoming frequency that is the difference between 11700 and 10600 (or 1100) and that frequency won't be there, so the receiver will tell you that it doesn't see a signal at all, hence the low signal level and low or non-existant quality reading.
If you know and understand this, then you know the theory. If you know the theory, then is is just a matter of determining the location to enter the proper data within the menus. I wish I knoew precisely where to direct you, but I don't know the Traxis, so I would be guessing. But I would be willing to say somewhere in the main set up page for each specific and individual satellite.
Hope this information helps and makes sense.
RADAR