Therein lies the rub; you'll have a family of signals of widely varying signal strength over a fairly large bandwidth. A real challenge for the analog part of the receiver design.
How many bits of A/D do you have at 1MS/S with this device? I've worked on several successful commercial LORAN-C receiver designs over the years - all of them with linear front ends and hard limiting back ends to interface with the tracking logic. These provided very high performance in terms of zero crossing displacement vs signal strength - but were designed to avoid allowing anything we could possibly exclude outside of the 20 percent bandwidth needed for LORAN to make it through the receiver to the limiters - to avoid the "FM capture" effect one often sees with a limiting receiver. Good quality front end filtering with low group delay distortion were the order of the day for performance - along with notch filters for the strong LF RTTY signals that were always annoyingly close by in frequency. Receivers without hard limiting and direct analog sampling by A/D were just becoming practical from a design standpoint when I left the LORAN-C world for greener pastures. I'm happy to join in on the design if there's interest. -Carl On Thu, 2008-07-03 at 21:38 +0000, Poul-Henning Kamp wrote: > In message <[EMAIL PROTECTED]>, Magnus Danie > lson writes: > > >It would be nice to have LORAN-C, MSF and DCF-77 in the same solution if > >possible. I am sure some of the US signals can be included. > > It's trivial to do phase-tracking on any moderately strong CW signal > at the same time, so that could easily be done using the same chip. > > The analog side would need to allow for those signals also then. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
