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  1. #1
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    Using ALP Radio Mute and Control Functions

    I am getting ready to install my new ALP system. I have brought it up on the bench and upgraded the firmware. Everything is working as expected. I just wanted to validate my approach with others with respect to using the radio mute and control wire.

    For the radio mute, my radio has a telecom mute that expects a ground signal in order to mute. It looks like the ALP radio mute puts out 5VDC UNTIL it is activated and then the voltage falls to 0VDC (ground) when triggered. I am not sure I can have 5VDC sitting on my radio mute most of the time prior to sensor activation. This means I will probably need to isolate this circuit with a 5VDC relay that, in turn, drags my radio mute to ground from an open state. Is this the way others have approached this?

    For the control wire, it is opposite. The control wire sits at 0VDC UNTIL activation and then puts out 5VDC. I want use this 5VDC to drive a relay that cuts out my rear brake lights for the duration of activation that I have set (7 seconds). In case I get hit from the rear, I don't want the LEO to see my brake lights come on.

    I just wanted to validate this approach with others and see what others have done.

    Thanks!

  2. #2
    Senior Member BestRadarDetectors's Avatar
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    Quote Originally Posted by Krus8r View Post
    I am getting ready to install my new ALP system. I have brought it up on the bench and upgraded the firmware. Everything is working as expected. I just wanted to validate my approach with others with respect to using the radio mute and control wire.

    For the radio mute, my radio has a telecom mute that expects a ground signal in order to mute. It looks like the ALP radio mute puts out 5VDC UNTIL it is activated and then the voltage falls to 0VDC (ground) when triggered. I am not sure I can have 5VDC sitting on my radio mute most of the time prior to sensor activation. This means I will probably need to isolate this circuit with a 5VDC relay that, in turn, drags my radio mute to ground from an open state. Is this the way others have approached this?

    For the control wire, it is opposite. The control wire sits at 0VDC UNTIL activation and then puts out 5VDC. I want use this 5VDC to drive a relay that cuts out my rear brake lights for the duration of activation that I have set (7 seconds). In case I get hit from the rear, I don't want the LEO to see my brake lights come on.

    I just wanted to validate this approach with others and see what others have done.

    Thanks!
    DO NOT KILL YOUR BREAK LIGHTS! You will risk a serious accident doing so. Imagine Driving 90MPH and having someone behind you and you slam on your brakes with no lights. You are not only putting yourself at risk for a serious accident but everyone else on the road. This is a bad idea.
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  3. The Following 4 Users Say Thank You to BestRadarDetectors For This Useful Post:

    curmudgeon (09-24-2014), modsl55amg (06-20-2015), Salty (09-23-2014), specifics (10-04-2014)

  4. #3
    Senior Member RigToFly01's Avatar
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    Quote Originally Posted by BestRadarDetectors View Post
    DO NOT KILL YOUR BREAK LIGHTS! You will risk a serious accident doing so. Imagine Driving 90MPH and having someone behind you and you slam on your brakes with no lights. You are not only putting yourself at risk for a serious accident but everyone else on the road. This is a bad idea.
    I agree with BRD this is a really bad idea. This topic came up some months ago and I mentioned it to a lawyer pal of mine that deals with auto collisions all the time. He told me that if you had something like this installed on your car and you were in accident or caused one due to the that device you could be held criminally responsible and be completely screwed in a civil case.
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  6. #4
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    Got it - good arguments.

  7. #5
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    What car are you installing this on? I know with the BMW "telematics mute" radio wire the ALP works fine without isolation. If you are concerned just throw a diode on the trigger wire - stripe side towards the ALP ground output. Much easier than a relay.

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  9. #6
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    Quote Originally Posted by ApexOnYou View Post
    What car are you installing this on? I know with the BMW "telematics mute" radio wire the ALP works fine without isolation. If you are concerned just throw a diode on the trigger wire - stripe side towards the ALP ground output. Much easier than a relay.
    It is a 2002 Porsche 911 with the OEM Bose system. I like you idea about using a diode, seems much cleaner. Thank you.

  10. #7
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    If you don't have any on hand RadioShack should carry them, a "1N4001" diode would work fine.

  11. #8
    Senior Member Tman's Avatar
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    Quote Originally Posted by ApexOnYou View Post
    If you don't have any on hand RadioShack should carry them, a "1N4001" diode would work fine.
    I dont see how a diode will do the trick ? i would like to understand how , not to confront your saying

    There is no relay alone that can be triggered by any of the wire green or blue.
    None of those wires push enough amperage to run even the tinyest relay .

    There is a way but dont know if you have access to advanced.

  12. #9
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    Quote Originally Posted by Tman View Post
    I dont see how a diode will do the trick ? i would like to understand how , not to confront your saying

    There is no relay alone that can be triggered by any of the wire green or blue.
    None of those wires push enough amperage to run even the tinyest relay .

    There is a way but dont know if you have access to advanced.
    Think of the diode as an electronic check valve - flow is only permitted one way. If the ALP mute wire is in fact outputting 5v at standby (I don't recall what mine was doing) and ground when triggered a diode will block the 5v from reaching the radio circuit while still allowing the circuit to ground on activation. There's probably a better explanation of this on www.the12volt.com

    You can most certainly trigger relays from the ALP outputs though. You only need a few mA of current for a positive trigger and a ground for a negative trigger relay setup. Not saying OP should or shouldn't interfere with the cars brake circuit, just clarifying on the relay topic.
    Last edited by ApexOnYou; 09-25-2014 at 01:40 AM.

  13. #10
    Senior Member Tman's Avatar
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    Apex , i went this road , i got the final answer from Alp :

    '' sorry, relays are not yet supported. We constantly work on new updates and functionality extensions, as you probably are aware of. Stay tuned for our newsletters, latest news are usually updated monthly.

    Have a great day!
    Your ALPriority Support team
    --
    AL Sales - Croatia
    Radikal d.o.o. - J. Mise 8, HR - 10360 Sesvete
    Mob: +385 91 446 6657
    E-mail: info@alpriority.com
    Web: www.alg9.com, www.alpriority.com ''

    This is not to say a kill is un-doable , but definitively not by triggering a relay using signal from blue\green wire.
    I tried with a micro relay rated 3 volts ...not enough push .




    Quote Originally Posted by ApexOnYou View Post
    Think of the diode as an electronic check valve - flow is only permitted one way. If the ALP mute wire is in fact outputting 5v at standby (I don't recall what mine was doing) and ground when triggered a diode will block the 5v from reaching the radio circuit while still allowing the circuit to ground on activation. There's probably a better explanation of this on www.the12volt.com

    You can most certainly trigger relays from the ALP outputs though. You only need a few mA of current for a positive trigger and a ground for a negative trigger relay setup. Not saying OP should or shouldn't interfere with the cars brake circuit, just clarifying on the relay topic.

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