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				 Posted: Sun Jul 02, 2006 2:52 pm    Post subject: Cell phone to stereo C-90-XDP4000 | 
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 I see there is a cell phone attenuator on my C90.
 
 Anyway to have my cell phone come in through my combo?
 
 I also have the XA 300.
 
 
 Well you could but it wouldn't be easy.  There was an adapter for certain 
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 Sony Clie (Palm-based PDAs) to UniLink but it was mainly for GPS IIRC.  It 
 was only compatible with 2002+ UniLink heads I believe and what it would do 
 was mute the stereo and replace the audio with prompts from the GPS-equipped 
 Clie.  This adapter was quite rare and relatively expensive, plus you had to 
 have a compatible Clie and GPS unit and software for it to all work.
 
 What you could do with the XA-300 would be to route cell-phone audio to one 
 of the inputs and then manually switch to that input when a call comes in.  
 You'd need to have a phone with a micro-jack headset port (most phones have 
 this but some have a proprietary connection for wired headsets), which you 
 could easily extract the earpeice audio from using widely-available adapters 
 and route the [mono] audio to the XA-300.  You could also hook up a mono mic 
 via the same connection.
 
 The cell mute wire that seems to still be on a lot of Sony HUs is pretty 
 useless.  Not because it doesn't work--it does, that wire will instantly 
 activate the attenuation feature on the HU--but because there aren't any 
 phones/cradles these days that support ring-output to actually activate that 
 feature.  It's ashame too, I've also always wanted to use that feature but 
 the phone manufacturers just don't make such equipment and I've seen little 
 aftermarket gear that can do it either.  But there isn't really a way to 
 combine the use of the cell mute wire and automatic input of cellphone 
 audio--it doesn't work like that unfortunately.
 
 There are some small novelty items I've seen that can detect certain cell 
 phone frequency activity (like pens that can light up when a cell phone 
 rings for example) that given enough work you could probably somehow build a 
 circuit to activate that mute wire.  I know Pioneer used to have an adapter 
 like that, which would detect CDMA activity (and perhaps GSM and TDMA as 
 well, I can't remember) and would activate the same wire on many Pio HUs.  I 
 don't know if they still make it but it's a thought...
 
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