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depends on what you mean buy bands if you mean fan belt and pulley belts you cannot there self adjusting there is a large roller wheel with a spring loaded tensioner that does this if the bands are loose either the belts have stretched or the springs in the tensioner have gone
By Codes do you mean the X, K and Ka signals that the unit is reporting? If so, those are the 3 bands used for police radar. X is the oldest and not used very much. K is also an older band. Ka however is the newer band and the most used for speed tracking.
I am sorry but there is nothing to choose with as the e250i is dual-band GSM phone. This means it uses The e250i mobile was introduced in 2009 as a dual band (900 and 1800 MHz) variant version of the tri-band (900, 1800 and 1900 MHz). There is no getting around this since the radio is dual-band only.
See Whistler's FAQ page for the meaning of the alerts and the bands the unit receives. Radar Bands (X, K, Ka)- What do they mean? Click on this FAQ and it will explain it all to you.
The display just shows you the different types of radar bands it is detecting. For example, the is an X band, a K band, a KA band and so forth. All it is, is a different frequency of radar being used.
X band is usually some electrical signal not to worry. K band is usually a radar sign or machine that tells you your speed. (Small town Sheriffs use this band also because they cant afford newer technology) Ka means K band America- If you see this symbol slow down and look around. Ku means K band Europe- If you see this symbol slow down and look around
Dual band means it is working on both 2.4Ghz and 5Ghz frequency. If your computer can connect on both frequency that only means that the wireless adapter in your computer is also dual band.
When "X" lights up, this means that your RD is either detecting X band police radar or that it is detecting an X band microwave automatic door opener.
When "K" lights up, this means the same as above except that the radar signal is a K band radar signal.
When "Ka" lights up, then this means that your RD is detecting police Ka band radar since no automatic door openers operate on Ka band.
When "VG-2" lights up, this is supposed to mean that your RD is detecting a VG-2 radar detector detector (RDD). Police use RDDs such as the VG2 and the Spectre to indicate that a motorist is using a radar detector.
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