Question about Audio & Video Receivers

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DEH-P7900 BT US model. Isthere any way I could change the tuner frequency to european one. Thanks.

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  • fisherman117 Mar 31, 2008

    As you described it the tuning in my DEH-P7900BT is in odd increments, but most of the FM stations in Erope are in even. my question was could i press any combination of buttons to change it from odd to even frequences( 95 instead of 95.1)

  • fisherman117 Mar 31, 2008

    the tuning in my DEH-P7900BT is in odd increments, but most of the FM stations in Erope are in even. my question was could i press any combination of buttons to change it from odd to even frequences( 95 instead of 95.1)

  • fisherman117 Mar 31, 2008

    Thanks for that reply, so I see there is no easy solution for my problem. I understand I will have to live with it. But the idea with new firmware was good. Is ther any place I could get it. The Pioneer doesn't provide any, they say in FAQ that nothing can be done. So I should have thought twice before buying.

  • Jerry Greenberg
    Jerry Greenberg May 31, 2012

    All of these digital type tuners (receivers) use a uPC to control them. The tuning is done using what is called a pre-scaler circuit that drives what in basic terms is known as a veractor type circuit. The uPC drives a chip or decrete type circuit (depending on particular design) that makes an extremely stable DC type control ramp voltage source. This voltage source controled by the uPC referenced from the user tuning, biases the veractor device (circuit).

    The veractor circuit controls the tuned circuits (RCL) network that consists of the resistive, capacitave, and inductivce (reactive) type circuits that do the actual tuning and receiving. The front end design with the RCL network also has frequency range limitations. I know the frequency band in EU is also slightly different than in NA. Even if you found a way to make the tuner work in the EU standard, there would be an issue with the frequency band range.

    Going back to the uPC, this microcontroler works on software, which is refered to as firmware. Manufactures like Pioneer, Sony, Panasonic, and etc, use prepietary type software design. Most of their chip devices like espcially the uPC are custom designed for them and their particular design requirment. Therefore I have my doubts you would ever be able to find another firmware that can be loaded in to your tuner.

    And... If in the case you wanted to access the internal firmware (software) in your tuner, you would need access to the uPC write port, which is not provided on the circuit board of any of these types of consumer devices that I know of. Some of the very high end audiofile type receivers have factory level access only.

    When the tuner uPC's and chipsets are manufactured, the firmware is burned in during the manfacture process. Most of the time, it is a one way burnin. It cannot be erased and re-written. This keeps the cost down, and also limits people from modifying the device performance.

    Jerry G.

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Hola tengo el mismo estereo que ustedes, el deh p7900bt pero el mio no tiene usb atras, mas alla de que el manual dice usb opcional. e visto algunos modelos parecidos que sale por detras un cable con el usb hembra, pero el mio ni eso. me faltara un cable? o lleva un cable que se compra aparte? porque nadie me sabe decir

Posted on Nov 04, 2014

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Hi,

I believe I understand your concern.

To my knowledge, there are two (2) possible ways this can be done:
1. the easiest. offset/de-tune the tuner of the DEH-P7900. Specifically you would need a tech who is willing to adjust the VCO of the PLL. In effect the end result would be that the display would be 95.1 but internally it would be 95.0. This could be done using a frequency counter and an FM signal generator. An un-technical workaround would be to do just that in UK and whoever is going to perform the de-tuning would simply wing it by using his ear and the "stereo" indicator.
2. Technically correct but the most difficult. You need to reprogram the firmware of the DEH-P7900. The FM tuning increment must be adjusted from whatever its current setting is down to 1. In effect what would happen is the tuner will scan/select in steps of 1 or lower or whatever is applicatble in your region. Basically it will make the radio tune from 95.1 to 95.2 and so on not jumping 95.1 to 95.3. A 0.5 increment will make it go 95.1, 95.15, 95.2, 95.25 and so on.

In some versions this could be user programmable as part of the setup menu.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Mar 31, 2008

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  • Louie  Role
    Louie Role Mar 31, 2008

    Hi again,

    If I may add, the FM radio preset stations in:
    United States from 88.1 MHz to 107.9 MHz in 200 kHz steps
    United Kingdom from 87.5 MHz to 108.0 MHz in 100 kHz steps

    hence making the tuning steps (FM tuning increment) go down from 2 to 1 (KHz) should make the DEH-P7900 UK FM stations compatible.

  • Louie  Role
    Louie Role Mar 31, 2008

    This might interest you. It's as Pioneer DEH-P7900UB, and I get the impression that it is already preset for European market

  • Louie  Role
    Louie Role Apr 01, 2008

    A variation of the firmware option
    It is also very possible to trick the existing firmware but that would need a tech who is very capable of component level modifications (in the logic circuitry)
    By chance would the Pioneer DEH-P7900BT US version be operated in UK? If yes, one of our resident expert, pauldonp is based there and I can send him details. One of his areas of specialization is car audio.

    Based on your last post "...will have to live with it..." then if for any reason it still doesn't work after Paul worked on it, you loose nothing. But if it succeeds, then it is your gain.

    Pls comment/post back if this is agreeable with you that I can initiate discussion with Paul.

    Cheers.

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Hello.
As i read in the forum could be calibrated but maybe the expert in radio can calibrate that. maybe this link can help you. http://www.cadillacforums.com/forums/cadillac-escalade-ext-esv-forum-1999/93999-changing-fm-tuner-frequency-us-standard.html

melnavz

Posted on Mar 31, 2008

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This is a US model and will tune most AM/FM stations in the UK/Europe. The FM broadcast band is 87.8 to 108.0 MHz. so it will not pick up any FM stations outside this range. Also, the tuning is in odd increments (such as 96.1, 96.3, 96.5, etc.) so some stations with even frequencies will be slightly distorted, depending on the power of the signal the station generates.

u have change its bit u have a proper knowlge of electronics componet of ur reciver so u have do this chage in ur radio trimmers its & coil of antina its change ur redio frequncy
i m not gudie u do it ur self in this problem suess reatio is 10%
if problem is not solve then u have to bye new readio set

Posted on Mar 31, 2008

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What is the radio FM Frequency range in my tuner?
All of the Pioneer head unit tuner for FM Frequency use range from 87.9MHz to 107.9MHz
Sergio

Posted on Mar 30, 2008

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The DEH-P7900BT is almost identical to the DEH-P85BT sold in Europe.

This is a US model and will tune most AM/FM stations in the UK/Europe. The FM broadcast band is 87.8 to 108.0 MHz. so it will not pick up any FM stations outside this range. Also, the tuning is in odd increments (such as 96.1, 96.3, 96.5, etc.) so some stations with even frequencies will be slightly distorted, depending on the power of the signal the station generates.


I found this bit of info for you but ill keep looking and let you know what i find out.
Also have you tried it in europe to see if it does work or not let me know ok

Posted on Mar 30, 2008

  • paul proctor Apr 01, 2008

    Hi fisherman here is a list of our stations in uk compare these to your frequency you can get on yours and tell me what the nearest frequency you get is ok
    Radio 1 is 97.9
    Brmb is 96.4
    Galaxy 102.2
    Heart fm 105.7
    please let me know the closest freq you can get to these stations are based on your stereo ok

  • paul proctor Apr 01, 2008

    Hi check the freq and see how close you can get then ill compare it to where i am in uk and let you know ok

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