Hi Necks. Thought I'd try and return a favour to everyone.

Maplin do a half decent sound card (which is probably an oem Chinese thing).

It works well with RDS etc. Plus they can be found for £25 second hand.

http://www.maplin.co.uk/p/maplin-hd-71- ... GwoddRcIWw


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Do you know if its AC or DC coupled? If its AC coupled it might be worth pulling it apart and seeing if the capacitors on the output can be bypassed.

The majority of soundcards these days are AC coupled for driving speakers and headphones etc... Connecting the MPX input of a transmitter to an AC coupled soundcard will cause problems with low frequencies around 30hz. A square wave doesn't come out as a square wave and needs "tilt correction" to prevent over deviating.

You can get much cheaper ones if you shop around on Ebay! I just got a couple of 192kHz Soundblasters for $14 each including postage from Malaysia. I've bought stuff from this seller before, and he's always been reliable.

A lot of computers have a 192 kHz capable soundcard on the motherboard nowadays. I've got two Dells at home that are like this - a T5500 and a slimline Optiplex (a fairly new one - I think it's a 990).
One thing you've got to be careful of though is whether it samples each channel half of the time, thus making it 2 x 96 = 192 kHz but not useful for what we want to do. Lots of modern oscilloscopes do this.