On Fri, Mar 17, 2006 at 10:48:24AM -0800, Matt Ettus wrote:
It just seeemd strange to me that a very large number, d_freq, which is
bounds limited to between d_min_freq and d_max_freq, is inside a
function trying to limit it's output to between +PI and -PI.
if(100e3 M_PI)
On Fri, Mar 17, 2006 at 11:06:00AM -0500, Charles Swiger wrote:
On Thu, 2006-03-16 at 19:55 -0500, Robert McGwier wrote:
phase is ALWAYS computed in an NCO by phase = phase + freq so this says that
phase_new = (phase_old + GAIN_FOR_PHASE*measured-phase-err) +
NewFrequency. SO
Matt Ettus wrote:
It just seeemd strange to me that a very large number, d_freq, which is
bounds limited to between d_min_freq and d_max_freq, is inside a
function trying to limit it's output to between +PI and -PI.
if(100e3 M_PI)
return(100e3-M_TWOPI)
or 3.7168... error can get
On Fri, 2006-03-17 at 10:16 -0800, Eric Blossom wrote:
The function has the right name, mod_2pi, but the wrong implementation ;)
These are commonly called bugs ;) Hence my comments above about doing the
mod the right way.
Roger that. Plowing right ahead with a hacked 1st order PLL filter,
On Fri, 2006-03-17 at 14:46 -0500, Charles Swiger wrote:
There must be a trivial way to change +7.5kHz to -7.5kHz so we can use
complex mixing...
Ah ha - it's invert either I or Q.
c2f = gr.complex_to_float()
phase1 = gr.multiply_const_ff(-1)
phase2 = gr.multiply_const_ff(1)
f2c =
On Fri, 2006-03-17 at 15:02 -0800, [EMAIL PROTECTED] wrote:
On Fri, Mar 17, 2006 at 05:32:20PM -0500, Charles Swiger wrote:
On Fri, 2006-03-17 at 14:46 -0500, Charles Swiger wrote:
There must be a trivial way to change +7.5kHz to -7.5kHz so we can use
complex mixing...
A
I'm looking for clues on the transfer function for gr.pll_refout_cc()
as to how to find optimum values for alpha beta.
Using experimental methods: http://webpages.charter.net/cswiger/pll/
( script requires special versions of gr_pll_refout_cc.h,i )
Interesting how, as the input signal is
On Thu, Mar 16, 2006 at 05:24:26PM -0500, Charles Swiger wrote:
On Thu, 2006-03-16 at 12:35 -0800, Eric Blossom wrote:
Chuck, I could have this totally wrong (the code definitely needs some
comments), but it's a second order control loop. We're adjusting both the
estimates of the phase
On Thu, Mar 16, 2006 at 05:49:34PM -0500, Charles Swiger wrote:
On Thu, 2006-03-16 at 14:39 -0800, Eric Blossom wrote:
On Thu, Mar 16, 2006 at 05:24:26PM -0500, Charles Swiger wrote:
On Thu, 2006-03-16 at 12:35 -0800, Eric Blossom wrote:
Here's the only place they're used:
