|
From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] bug in wfm_rcv_pll and fix, who has stereo FM specs/info and noise and gain issues |
Date: | Wed, 20 Jun 2007 20:29:52 -0700 |
User-agent: | Thunderbird 2.0.0.0 (X11/20070326) |
>> I would try this with the regular (non-PLL) FM demod. I think the >> rolloff of the PLL tracking loop is what is giving you the lower gain. >> > Yes, that seems to be the problem. > For now I switched to using the non-PLL FM-demod. > > Do you know if/how I can make a PLL which does not have this high roll-of. > I played with the pll-parameters but that doesn't seem to help. > It is critically damped, so that is probably the best we can get with this > pll. > Would I need another type of pll with a higher order loop-filter or something > like that. > I think it's just a question of bandwidth. Have you confirmed that the PLL has at least 60 kHz of bandwidth? Matt
[Prev in Thread] | Current Thread | [Next in Thread] |