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Hi,
PocketRTA pro is excellent software. The problem I've had was finding a PDA or SmartPhone with a good quality audio chain (including A/D conversion). Computer makers are of course not marketing to audio people, as they publish ZERO specs for audio. Dell didn't even bother to tell consumers that the AximX50 & X51 have external audio input capability via the headphone jack (used in conjunction with a 4 conductor 1/8 inch plug). I have no experience with other PDAs, but have found that the AximX50/51, for has relatively poor performance as compared to consumer audio gear even. Output frequency response is roughly +and- 3dBm from 20Hz to 2kHz; 6dB down at 3kHz, and about 11dB down at 10kHz. Even more significant in the context of trying to use the X50/51 as a sound measurement tool platform is the input response: Roughly + and - 3dBm from 400Hz to 8kHz, with high end response rolling off sharply at just above 8kHz (12dB down at somewhere around 8.2kHz). My experience so far has been that the PocketRTA software performs wonderfully, rather it is the audio chain of the PDA where weakness lies. If there are any engineers out there who are aware of a fix, I'd love to be enlightened! :-) I'm toying with the idea of taking my PDA apart & looking for any RC filter component on the front end that I can bypass. In spite of this apparent frequency response issues with my Dell, the PocketRTA Pro calibration mode allows one to compensate for frequency response error, so I will be experimenting with that and comparing performance along side SMAART Live to see if I can get this PDA thing in the ball park. I would add that the PocketRTA automatic frequency identification feature with numerical display is just amazing to have when setting up PA systems too.
Sky
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