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[VXL V6]

What sort of impedance? CPC / Farnell seem to list a few options.

[TheBoy]

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?

[Dave DND]

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?

[TheBoy]

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)

[VXL V6]

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!

[Marks DTM Calib]

Lol, coax/cable impedance is not a big issue at audio frequencies!

So, what exactly is the setup and issue?

[TheBoy]

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.

[Kevin Wood]

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

[TheBoy]

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?

[Kevin Wood]

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

[TheBoy]

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.

[Kevin Wood]

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

[TheBoy]

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

[Kevin Wood]

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

[TheBoy]

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