Hello Paul and all, With much interest I read your 'pioneering postings' concerning your 'poor mans' LORAN-C-project.
> My current darling is the Analog.com ADUC7026, which seems to have the > best analog section, but which needs a 42 MHz clock input to sample > the antenna signal exactly 1 million times per second. > > A close second is the www.st.com STM32F103RBT6 which needs a 56 MHz > clock to run the ADC at 1MSPS, getting 33% more CPU power at the > same time. > In both cases, an external PLL (the TAPR Clock-Block ?) will be necessary > from the atomic frequency to the clock input. Perhaps it would be an idea to use an Rb-standard with an integrated DDS, such as the FE-5680A. It is capable of producing frequencies up to 20 MHz (and a bit higher). Let it run on 1/3 of the necessary clock frequency and multiply by 3 with a transistor in class C with subsequent filtering and clamping (after all, there are a lot of HAMs here ;;-). Perhaps with the ADUC7026 21 MHz might be possible, in that case multiplication by 2 can be achieved with EXORs. You loose, of course, a bit of precision, but the 'hazzle' is less. FE-5680A's can be obtained relatively cheaply on Ebay. Hope this speeds up your project? Remco _______________________________________________ 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.
