Hi,

I don't know if I can be of any help but I'm working on a side scan
sonar (250KHz) myself. I guess that's in the same direction as you?

Peter

man, 2002-06-03 kl. 21:38 skrev Goring, Steve:
> You could help me out Brandon ...
>
> I am developing a small ROV and the next bit involves some
> underwater sonar ( freq range 40 - 500 khz ).
>
> Higher the freq, more direction less range.
>
> Does that sound like something that would interest ??
>
>
> Steve
>
>
>
> -----Original Message-----
> From: Brandon Fosdick [mailto:bfoz@TERRANDEV.COM]
> Sent: Monday, June 03, 2002 8:18 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Phased arrays, ultrasound etc.
>
>
> I'm looking for a new project and phased array antennas have always
> intriqued
> me. RF is a bit of a black art for me so I'm thinking about playing with
> sound
> instead. I have no idea what I'm going to make, this is still in the
> thinking
> stage. Maybe a locater beacon/tracker for model rockets.
>
> I understand the basics of phased arrays, but I'm not too clear on the
> details.
> Both google and amazon have lots of info on RF arrays, how much of that is
> applicable for sound? Since both sound and EM radiation are waves I would
> expect
> to find a lot of similarities. Some of the RF books on amazon are a bit
> expensive, and I'd hate to spend a lot of money on a book shelf ornament.
> Any
> recommendations?
>
> I did a quick Digikey search for microphones and everything that came up was
> limited to audible frequencies (<20kHz). Where do I find a good source of
> high
> frequency microphones/speakers?
>
> What frequency range should I be looking at? I have pets so I'd like to go
> high
> enough to avoid annoying them if possible. Any idea what range medical
> ultrasound devices use?
>
> I imagine I'm going to need some high speed ADC's. I've looked over the
> corresponding parts from TI and Maxim (any other manufacturers I should look
> at?) and there's a wide variety to choose from. What are ECL interface
> levels?
> I've never designed a digital circuit over 20MHz, any gotchas that I need to
> know about?
>
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>
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