Re: [Discuss-gnuradio] bandwidths< 400Khz no longer work with USRP2

[Marcus D. Leech]

On 11/17/2010 12:43 PM, Marcus D. Leech wrote:
> What I'm seeing is that the magnitudes (as seen in the number sink) 
> coming off the source, even with roughly  75dB of gain ahead
>   are roughly 0.002 to 0.003 when I'm using 400KHz sampling, and 
> roughly 0.0006 to 0.0007 when the bandwidth is 250KHz.  If you
>   process the numbers as voltages, then we're talking a roughly 10dB 
> drop in apparent average power level by reducing the bandwidth
>   by less than 3dB.  Both 400Khz and 250KHz use a decimation that is 
> both even, and a multiple of 4, so they should be using exactly
>   the same filter sequence in the decimator, correct?
Marcus, you're a blithering idiot who should routinely be denied air.  
You have clearly conflated the decimation/bandwidth numbers and
  erroneously come to the conclusion that they should use the same 
half-band filter lineup.  They don't, you stupid, sorry excuse for
  an advanced lifeform you. God, can you even tie your shoes reliably?  
Let's see, 250KHz uses a decimation of 400, which uses both
  half-bands in the FPGA because it's both even and a multiple of 4, 
whereas 400KHz uses a decimation of 250, which is even, but not a
  multiple of four, and so only uses a single half-band.  So 
*naturally*, the numbers won't "add up" between the two bandwidths.

Frikkin' hell man, get a clue would you?  Before I come over there and 
whack you upside the head with a gnarly-great clue-by-four.

:-) :-) :-)