spectrum recording

[gopher]

if i want to record 17 frequencies from my local simulcast @ 12.5 kHz bandwidth of raw P25 data with a SDR radio what would the Mb/s requirements be at max all 17 in use????

[mr.syntrx]

Depends on how wide a snapshot of spectrum you want to take.

Are you going to record 17 channels individually, or sample a huge slice of spectrum containing all those channels? If so, how far apart are the lowest and highest frequencies?

[SlimBob]

The width of the signals together in one chunk, mixed down to baseband like you'd see on a spectrum analyzer. If you want 453.000 to 453.500, you're going to need 500KHz of baseband, and the sample depth is your dynamic range.

(17 * 12.5KHz) + (17* guardbandwidth) = $number
$number * sample depth in bits = $samplebitrate