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Thread: DAB DAB+ FM Digital Radio Development Board

  1. #301
    FLAC SNOtwistR's Avatar
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    I hope your on the road to recovery Mickz. Relax and get well soon SNO

  2. #302
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    Quote Originally Posted by SNOtwistR View Post
    I hope your on the road to recovery Mickz. Relax and get well soon SNO
    +1

  3. #303
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    +1

    and thanks for the fast turnaround. Works great!


    JJ

  4. #304
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    Great work you guys, especially Mickz
    I bought one of these boards hoping that soon someone would write a plugin but in the meantime I just added a DAB.skin to REBORN
    I'm a newbie to skinning so I'm having troubles getting the Mickz's DabFmSa1 app to close when I exit/close the skin (DAB.skin)
    The skin exits back to the Menu.skin but the app is still running in the background. If I try to open the DAB menu item again the
    DabFmSa1 screen is not displayed and I have to exit out of RR close to app in windows (7) then re-enter RR then the DAB selection
    works again. I hope this makes sense! Can the PWR OFF button in the app be made to exit the app as well as shutting down the board?

  5. #305
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    A while ago, I promised here on this thread to report back on my experience in improving DAB reception via various aerials including glass mounts and roof mounts. The need arose due to the fact that the stock amped aerial on my 09 Jeep Cherokee (you yanks call them Liberty), was not tuned to provide DAB reception - It was FM only. I did run the Dabmonkey board in FM only for a short period of time in the car (using the OEM aerial) but quickly came to the starck conclusion that FM sound quality is not what I will be happy with, considering the quality of sound the DABmonkey board is capable of producing, and this is where my experiences begins.

    A secondary issue I also wanted to resolve once and so all was annoying hissing noise which was audible 'on top of' the radio sound signal - but more on this later.

    I first tested 2-3 various Glass mount aerials which JP form Dabmonkey was kind enough to send me. Unfortunately though, non of these glass units that I tested, provided any considerable improvement in DAB reception in the vehicle. furthermore, due to the nature of there mounting (on glass), there were also visually unappealing.

    I then decided to invest in a DAB external aerial and where? but non other than dabonwheels.co.uk. These guys supply all types of car aerials and accessories which are DAB specific. I also liked the inhouse aerial rating system they have, which standardises reception ratings.

    The aerial I initially purchased from dabonwheels was the Kinetic DEGA-4001 DAB car aerial. This unit was reasonably priced and also had 5/6 reception rating. This aerial though is unique as the internal base unit sticks to the inside of the glass and the mast is stuck on the other side of the window, without needing to drill a hole in the glass. Upon testing, I found the DAB reception to be erratic and unlistenable. I am still not quite sure whether there was an issue with that particular unit or a design fault. After getting in contact with dabonwheels, I was filled in a form and mailed the unit back for a refund.

    At this point in time, I was getting a little discouraged by all the negative results i was getting with Dab reception, so I decided to try 1 last time, but this time purchase an aerial which is a little more expensive, but is also a 'conventional type' as in the mast is directly connected to the base.

    This lead me to Kinetic DRA-6003 stubby DAB/DAB+/FM/SW/MW/LW car aerial. Initial thoughts were the aerial seems well made. The mast screws on to the base is is replaceable and removable for carwash etc. But having mickz's famous advise regarding groundloop issues, I decided to open up the base and have a good look at the board to make sure all is connected well, before installing on the car, which looked like this: Name:  2013-07-19 11.28.23.jpg
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    I noted the PCB was earthed to the metal base. A nut then clamps the base to the car chassis, earthing the +12v for amplification. I didn't think this method of earthing was satisfactory, especially with a unibody design chassis, such as the Jeep. So I then decided to run a separate earth wire, soldering one end to the aerial's base, and the other end earthing at the same point as the car pc. Name:  2013-07-19 11.44.09.jpg
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    Due to the fact that the aerial is a roof mount, ensuring water/moisture issues do not occur is a must. Just to be on the safe side, I siliconed the hole under the base where the wires come out of the aerial.Name:  2013-07-19 12.10.36.jpg
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    After waiting for the silicone to dry, I put the aerial back together and installed in car. Also, the user manual of the Kinetic 6003 advises to connect the +12V to a good stable connection. They prefer connecting directly to ignition (maybe via a relay), rather than the blue power aerial wire output offered by most head units as the current available in the blue wire is usually not sufficient.

    Testing of this aerial in the car proved to offer EXCELLENT stable DAB reception. But the one issue I was having and touched up earlier was still audible (and very annoying). Again, Mickz's wise advice about making sure all devices have the same potential came to mine. So I then got the trusty voltmeter out and started to test for resistance between various points in the carpc. The test showed a considerable difference in resistance between the motherboard's integrated soundcard chassis to the aerial earth point of the dabmonkey board. So I then soldered a wire between the two, in an effort to equalize the electrical potential...AND IT WORKED!! Name:  2013-07-28 14.57.34.jpg
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    I can say now that approximately 80% of the residual hissing has been eliminated by this simple mod. The remaining 20% is only audible when the system is at full volume, which you would not get close to on the normal commute.

    Thanks to every one here, Mickz as well as JP from DABmonkey for all your advise.

    PS. Get well Mickz - we miss you buddy, come back soon
    Last edited by mos33y; 07-28-2013 at 01:38 AM.

  6. #306
    Maximum Bitrate Mickz's Avatar
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    Quote Originally Posted by mos33y View Post
    Testing of this aerial in the car proved to offer EXCELLENT stable DAB reception. But the one issue I was having and touched up earlier was still audible (and very annoying). Again, Mickz's wise advice about making sure all devices have the same potential came to mine. So I then got the trusty voltmeter out and started to test for resistance between various points in the carpc. The test showed a considerable difference in resistance between the motherboard's integrated soundcard chassis to the aerial earth point of the dabmonkey board. So I then soldered a wire between the two, in an effort to equalize the electrical potential...AND IT WORKED!!Thanks to every one here, Mickz as well as JP from DABmonkey for all your advise.
    Hi mos33y, great write-up and pictures, very similar aerial to mine. Health slowly getting back to normal, still a way to go yet.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  7. #307
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    Quote Originally Posted by mos33y View Post
    The aerial I initially purchased from dabonwheels was the Kinetic DEGA-4001 DAB car aerial.
    Great write up mos33y. Thanks for putting the effort in to document your findings. I'd looked at the dabonwheels site, and it's good to get some feedback on the aerials.
    You've given us a good look at the internals on the DEGA-4001! but could you show me some of it in situ? The angles on some of them sound fairly steep.

    Also how did you find fitting, did you have to modify the existing hole at all?

    Thanks.

  8. #308
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    Hi!

    I think I've found a couple of bugs in the software?

    1) Unable to restore application window. Not sure what I did, but until I deleted the radio.ini file and started over, I was unable to bring up the application window. It was only visible on the taskbar.
    Not sure if its a problem with the radio.ini file, but I've included it here. r.rar

    2) In the font size screen, its possible to change the %value directely, but it doesn't take affect. Took a while before I realized I needed to use the scrollbar to set the % value, and not write the %.


    JJ

  9. #309
    Maximum Bitrate Mickz's Avatar
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    Quote Originally Posted by johnjore View Post
    Hi!
    I think I've found a couple of bugs in the software?
    1) Unable to restore application window. Not sure what I did, but until I deleted the radio.ini file and started over, I was unable to bring up the application window. It was only visible on the taskbar.
    2) In the font size screen, its possible to change the %value directely, but it doesn't take affect. Took a while before I realized I needed to use the scrollbar to set the % value, and not write the %. JJ
    Hi JJ, health issues have again kept me from working on anything. I have seen the .ini file get corrupted once in a blue moon, I have commercial apps that have done the same, got no idea as it's impossible to replicate.

    I'll look at entering the value manually some time in the future (when health returns)

    I have uploaded a new app and exe file as I found full-screen mode and Win-name we not sticking across restarts.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  10. #310
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    Hi Mickz,
    Sorry to hear health issues are not resolved

    And thanks for updating the exe. I'll update my Kitchen PC and see how it goes. I've not managed to reproduce the issue.


    @mos33y
    I'll probably need to do what you've done. I too have that same anteanna but i'm not happy with it. Was out at by taramara this weekend, and signal dropped out a lot in that area.
    Same when going down south. According to the DAB map I was supposed to have "medium" quality, but had no signal


    JJ

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