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Skipping all the technical stuff, each FM broadcast channel is 0.2 MHz wide and starts on an even number. The lowest channel for example is, 87.8MHz - 88.0MHz. Radios will tune to the center channel, ie 87.9 MHz. Any FM station in the United States is always an odd number, therefore radios in the US will never tune to an even number
This is a USA model and by default in the USA all FM stations end in an Odd number. This is completely normal. you can try holding preset 1 and 5 down while pressing the reset button on the unit and it may allow you to switch to a Europe style of tuning.
Pioneer have factory set your DEH-P690UB to 0.2Mhz steps to match the American FM frequency allocations.
The fix is not casual as it requires complete disassembly of the head unit and repositioning of two surface mount resistors.
This will void any warrantee and unless you're good at microscopic soldering could also ruin the set.
I did however void my 2 year warrantee yesterday partly out of frustration and because I have the right SMT tools at work.
Now my tuner CPU thinks it's in the Austrailian/Asian model DEH-P7950UB and is also compatible with UK stations.
A previously hidden menu is also available where I can set either 0.1 or 0.05Mhz stepping for FM and 9 or 10KHz for AM BSM scanning.
The rotary control now steps in 0.05's instead of odd 0.2's on FM
Hope this helps.
That is very typical of tuners designed for the US market; US FM radio stations use only the odd numbers. In most cases, tuners made for the US cannot be adjusted for use in other countries. However, a few have an "area" control that can be switched; usually it's part of the setup menu. Check out your owner's manual, if it's available.
since the 70's when they started, FM radios in cars have only showed like 101.9 and 102.1 in odd number tenths-of-Megahertz only, with a few rare exceptions. There are some high cost receivers that will show odds and evens. Your 102 station is really either one of like 101.9 or 102.1 for your Pioneer.