Return-Path: Received: (qmail 19215 invoked from network); 29 Mar 2001 21:36:14 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by 10.226.25.101 with SMTP; 29 Mar 2001 21:36:14 -0000 Received: (qmail 16967 invoked from network); 29 Mar 2001 21:36:15 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 29 Mar 2001 21:36:15 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14ijdz-0003ON-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 29 Mar 2001 22:07:47 +0100 Received: from imo-r12.mx.aol.com ([152.163.225.66]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14ijdy-0003OB-00 for rsgb_lf_group@blacksheep.org; Thu, 29 Mar 2001 22:07:46 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from WarmSpgs@aol.com by imo-r12.mx.aol.com (mail_out_v29.14.) id l.63.13e055b0 (17526) for ; Thu, 29 Mar 2001 16:06:45 -0500 (EST) From: WarmSpgs@aol.com Message-ID: <63.13e055b0.27f4fde4@aol.com> Date: Thu, 29 Mar 2001 16:06:44 EST Subject: Re: LF: Re: PLL filter for BPSK To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit X-Mailer: AOL 4.0 for Windows 95 sub 120 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Rye Gewalt writes: << I always thought that was a standard method of demodulating phase information....>> (and) vernall@xtra.co.nz writes: << This approach may have applicability to detection of weak BPSK signals on LF, but I suspect that a single PLL with free running VCO would be rather useless for noise to signal scenarios. >> I'm not sure we're all talking about the same thing here. Rik, Jim, and I were discussing whether it would be feasible to use a PLL for filtering out abrupt phase transitions in the transmit exciter. I don't see any way of using one for detection at the receive end, for the very reason Bob mentions. 73, John