Omega Owners Forum
Omega Help Area => Omega Electrical and Audio Help => Topic started by: TheBoy on 01 November 2008, 10:29:27
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Still having an issue with telematics being too quiet - I assume it doesn't like the low impedence of U29. How about fitting a capacitor in line to hide the impedence? If so, what sort of value?
(http://theboy.omegaowners.com/oofpics/ncdr1500_install/IMG_3235.JPG)
Possibly need a high value resistor across audio from telematics to stop it throwing a code :-/
Would the Nokia CK7W's mute line provide enough power to drive the relay, and I still need a line off this to HU for telemute (not shown on diag).
Would the diag above solve my probs?
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Pity that the CK7W doesn't have the auxillary alert as per previous Nokia kits, sure that would have driven the relay.
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Pity that the CK7W doesn't have the auxillary alert as per previous Nokia kits, sure that would have driven the relay.
I can always put some silicon in from of relay if necessary.
My main concern is the capacitor on the TM feed.
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depends what you want to happen to the charge/current matey,
a smaller capacitor effectivly takes less to charge before discharging, and you could add a low value resistor to slow it down but depends if your wanting small charge or big charge and if it's slow or quick to charge and discharge
hope that helps
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Capacitor wont do anything .....as your talking impedance not DC resistance!
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ok then.. that got tb told :P lol
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hmm will have a think about this for you over the weekend will have to get all my electronics notes out i do remember doing theory on changing impedance for telecomms eqpmt
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Capacitor wont do anything .....as your talking impedance not DC resistance!
Ah, good thinking.
Any ideas?
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TB have you checked E0001233 on TIS?
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TB have you checked E0001233 on TIS?
Not a mic issue, its volume of 3rd party - needs to be at full volume to hear.
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TB have you checked E0001233 on TIS?
Not a mic issue, its volume of 3rd party - needs to be at full volume to hear.
Like its expecting a hand set to be on full volume?
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Not sure if I am understanding this problem fully?
But if I am, why not simply put a small amplifier (Should only require a couple of transistors, not a lot more) in line to boost the low volume?
If amp design is not your thing, a small amp is only a few quid from teh likes of maplins. Volume could then be adjusted for optimum levels.
Or am I missing something blindingly obvious here?
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Not sure if I am understanding this problem fully?
But if I am, why not simply put a small amplifier (Should only require a couple of transistors, not a lot more) in line to boost the low volume?
If amp design is not your thing, a small amp is only a few quid from teh likes of maplins. Volume could then be adjusted for optimum levels.
Or am I missing something blindingly obvious here?
I think the imepedence of U29 (an audio transformer not fitted to later models, that sits just in front of Aux In) is dragging the telematics volume down.
I guess I simply need to use same circuit above, but with relay switching the signals after U29. Only that means taking the bloody centre console out yet again. Ho hum.
What Craplins couldn't supply was a small shielded cable to use between telematics and HU for audio. Anyone know where I can get some?
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What Craplins couldn't supply was a small shielded cable to use between telematics and HU for audio. Anyone know where I can get some?
Why not use an RCA / Phono lead ? Cut the plugs off the end and solder directly / terminate accordingly?
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What Craplins couldn't supply was a small shielded cable to use between telematics and HU for audio. Anyone know where I can get some?
Why not use an RCA / Phono lead ? Cut the plugs off the end and solder directly / terminate accordingly?
From memory, wiring diags implied it was a shielded twin core. Guess I could use 2 of them....
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What sort of impedance? CPC / Farnell seem to list a few options.
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What sort of impedance? CPC / Farnell seem to list a few options.
Its not a coax, its a shielded twin, so would an impedence be specified?
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What sort of impedance? CPC / Farnell seem to list a few options.
Its not a coax, its a shielded twin, so would an impedence be specified?
I fear you may be going a little too deeply into the need of connecting two mis-matched units over a few inches of cable? Wouldn`t really worry about impedance of cable at this stage.
Yes, CPC / Farnell will supply 100m+ rolls, but do you really need that much?
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What sort of impedance? CPC / Farnell seem to list a few options.
Its not a coax, its a shielded twin, so would an impedence be specified?
I fear you may be going a little too deeply into the need of connecting two mis-matched units over a few inches of cable? Wouldn`t really worry about impedance of cable at this stage.
Yes, CPC / Farnell will supply 100m+ rolls, but do you really need that much?
Its currently running over Cat5 (all I had in house that had some level of interference protection, and the local Craplins had sod all better), but when connected directly to Stereo, definately a bit of cellular interference, as you would expect.
Telematics in boot, so at 5-6m I guess, 100m reel seems a bit excessive, though I guess I could then do the mic (also cat5'd)
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What sort of impedance? CPC / Farnell seem to list a few options.
Its not a coax, its a shielded twin, so would an impedence be specified?
Right, so no dielectric then. still a few available.... what about some FTP Cat5? I'm sure you have some of that!!!!
Sorry, scrap that, got interupted while replying! ;D
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Lol, coax/cable impedance is not a big issue at audio frequencies!
So, what exactly is the setup and issue?
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Lol, coax/cable impedance is not a big issue at audio frequencies!
So, what exactly is the setup and issue?
What I want to have is both Vauxhall Telematics and Nokia Bluetooth kit connected to back of stereo.
Currently, I have:
Telematics audio connected to the audio connection to Nokia CK-7W kit, leaving Nokia kit unplugged (having both connected like that is probably bad idea!).
Telematics is complaining of Audio Line Out, and the volume of phone calls is very low. I suspect this is because I have a low resistance across the audio looking towards HU from telematics. I am guessing this is because telephone prewired cars have an audio transformer/isolator fitted somewhere (U29)?
As a test, I have put wires from telematics straight onto back of HU, and volume fine, but get a lot of 'cellular type' interference on it, presumably due to using wrong cable type.
So, I guess I need to rerun audio from telematics in boot to HU in a decent screened cable?
In order to be able to use the Nokia bluetooth kit as well, I was going to but in a DPDT relay, activated by Nokia mute line, to switch the source, but unsure if it has the ability to sink the current to drive relay. Despite the wiring diags, the telematics does not need mute line, must happen over CAN.
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Does the Nokia car kit drive the head unit input OK via transformer?
If so, I would build a little driver stage to beef up the output of the telematics unit.
And it should be straightforward to drive the relay from the Nokia mute line. A transistor to switch the relay just in case it's not man enough.
I'd say from the telematics to the transformer a single pair from a CAT5 cable would probably be adequate. It'll be a fairly high signal level and balanced due to the transformer. I do have a reel of overall shielded twin cable if you want a couple of metres?
Kevin
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Does the Nokia car kit drive the head unit input OK via transformer?
If so, I would build a little driver stage to beef up the output of the telematics unit.
And it should be straightforward to drive the relay from the Nokia mute line. A transistor to switch the relay just in case it's not man enough.
I'd say from the telematics to the transformer a single pair from a CAT5 cable would probably be adequate. It'll be a fairly high signal level and balanced due to the transformer. I do have a reel of overall shielded twin cable if you want a couple of metres?
Kevin
Nokia CK7W is perfect through audio tranny.
Would it not be better to switch it in beyond u29 then?
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Does the Nokia car kit drive the head unit input OK via transformer?
If so, I would build a little driver stage to beef up the output of the telematics unit.
And it should be straightforward to drive the relay from the Nokia mute line. A transistor to switch the relay just in case it's not man enough.
I'd say from the telematics to the transformer a single pair from a CAT5 cable would probably be adequate. It'll be a fairly high signal level and balanced due to the transformer. I do have a reel of overall shielded twin cable if you want a couple of metres?
Kevin
Nokia CK7W is perfect through audio tranny.
Would it not be better to switch it in beyond u29 then?
You could try, but I wonder if the noise that was on the signal in that case was down to feeding an unbalanced input on the head unit. :-/
Kevin
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Does the Nokia car kit drive the head unit input OK via transformer?
If so, I would build a little driver stage to beef up the output of the telematics unit.
And it should be straightforward to drive the relay from the Nokia mute line. A transistor to switch the relay just in case it's not man enough.
I'd say from the telematics to the transformer a single pair from a CAT5 cable would probably be adequate. It'll be a fairly high signal level and balanced due to the transformer. I do have a reel of overall shielded twin cable if you want a couple of metres?
Kevin
Nokia CK7W is perfect through audio tranny.
Would it not be better to switch it in beyond u29 then?
You could try, but I wonder if the noise that was on the signal in that case was down to feeding an unbalanced input on the head unit. :-/
Kevin
Wiring diags show its supposed to be fed straight into HU, though obviously supposed to be in glovebox, and thus shorter cable run.
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Does the Nokia car kit drive the head unit input OK via transformer?
If so, I would build a little driver stage to beef up the output of the telematics unit.
And it should be straightforward to drive the relay from the Nokia mute line. A transistor to switch the relay just in case it's not man enough.
I'd say from the telematics to the transformer a single pair from a CAT5 cable would probably be adequate. It'll be a fairly high signal level and balanced due to the transformer. I do have a reel of overall shielded twin cable if you want a couple of metres?
Kevin
Nokia CK7W is perfect through audio tranny.
Would it not be better to switch it in beyond u29 then?
You could try, but I wonder if the noise that was on the signal in that case was down to feeding an unbalanced input on the head unit. :-/
Kevin
Wiring diags show its supposed to be fed straight into HU, though obviously supposed to be in glovebox, and thus shorter cable run.
Ahh, OK. The same HU, just with a different location of the telematics unit? In that case, might well be worth a try. I was assuming the transformer went with the head unit.
Kevin
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Does the Nokia car kit drive the head unit input OK via transformer?
If so, I would build a little driver stage to beef up the output of the telematics unit.
And it should be straightforward to drive the relay from the Nokia mute line. A transistor to switch the relay just in case it's not man enough.
I'd say from the telematics to the transformer a single pair from a CAT5 cable would probably be adequate. It'll be a fairly high signal level and balanced due to the transformer. I do have a reel of overall shielded twin cable if you want a couple of metres?
Kevin
Nokia CK7W is perfect through audio tranny.
Would it not be better to switch it in beyond u29 then?
You could try, but I wonder if the noise that was on the signal in that case was down to feeding an unbalanced input on the head unit. :-/
Kevin
Wiring diags show its supposed to be fed straight into HU, though obviously supposed to be in glovebox, and thus shorter cable run.
Ahh, OK. The same HU, just with a different location of the telematics unit? In that case, might well be worth a try. I was assuming the transformer went with the head unit.
Kevin
Check Wiring Diags, Omega 2003, Audio, Navigation system, and you can double check wiring
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Check Wiring Diags, Omega 2003, Audio, Navigation system, and you can double check wiring
Pins 35 & 36 of the head unit? Agreed, it looks like a balanced pair with an overall screen. Got to be worth trying a direct connection if you can find the transformer. The nokia kit might well work without it too. :-/
Kevin
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Check Wiring Diags, Omega 2003, Audio, Navigation system, and you can double check wiring
Pins 35 & 36 of the head unit? Agreed, it looks like a balanced pair with an overall screen. Got to be worth trying a direct connection if you can find the transformer. The nokia kit might well work without it too. :-/
Kevin
Was thinking about tapping into the cabling with my relay right at back of HU - so TM will be fed straight into HU, and Nokia still via U29
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Sorry if i'm barking up the wrong tree here, but wasn't the transformer in place because of issues with Bose equiped setups?
I know the transformers on the Autoleads 06-109B are present because of Bose problems.
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Check Wiring Diags, Omega 2003, Audio, Navigation system, and you can double check wiring
Pins 35 & 36 of the head unit? Agreed, it looks like a balanced pair with an overall screen. Got to be worth trying a direct connection if you can find the transformer. The nokia kit might well work without it too. :-/
Kevin
Was thinking about tapping into the cabling with my relay right at back of HU - so TM will be fed straight into HU, and Nokia still via U29
Yep. Might as well if that's easiest. You know the Nokia works through the transformer anyway.
I guess the telematics could complain that the output goes open circuit when the relay switches over to the Nokia, but that could perhaps be solved by terminating it with a resistor. See if it's a problem first. Could be that it only detects short circuit.
Kevin
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Sorry if i'm barking up the wrong tree here, but wasn't the transformer in place because of issues with Bose equiped setups?
I know the transformers on the Autoleads 06-109B are present because of Bose problems.
Wrong tree ;)
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Check Wiring Diags, Omega 2003, Audio, Navigation system, and you can double check wiring
Pins 35 & 36 of the head unit? Agreed, it looks like a balanced pair with an overall screen. Got to be worth trying a direct connection if you can find the transformer. The nokia kit might well work without it too. :-/
Kevin
Was thinking about tapping into the cabling with my relay right at back of HU - so TM will be fed straight into HU, and Nokia still via U29
Yep. Might as well if that's easiest. You know the Nokia works through the transformer anyway.
I guess the telematics could complain that the output goes open circuit when the relay switches over to the Nokia, but that could perhaps be solved by terminating it with a resistor. See if it's a problem first. Could be that it only detects short circuit.
Kevin
It complains about o/c as well as s/c, but not fussed if it stores a code, so long as it works OK. The entire system has a couple of errors not worth resolving - TM complains about aerial, HU complains that bose amp not connected (has its own signal for remote switch on, rather than using same for aerial amp).