MikeR

Comments

• Hi all,Why is the oscillator (ADC sample) frequency 66.6667MHz?  All the evidence appears to point to 66.6600MHz being what the system needs.  This would allow decimation down to _exactly_ 8.25kHz or 12kHz.  It seems this should remedy the fax "…

  in ADC Clock Frequency Correction via GPS Timing Comment by MikeR June 2017
• Thanks John. By the way, what is the exact nominal frequency of the external oscillator?  Is it exactly 66.6666MHz as shown on the schematic?  If it were 66.6600MHz then decimation would produce _exactly_ 12kHz.Cheers,Mike.

  in ADC Clock Frequency Correction via GPS Timing Comment by MikeR June 2017
• Hi John,Thanks for that.  I'd figured out the one wire solution.  We're on the same page.  The FPGA signal I was hoping you'd identify is the signal you mentioned earlier which indicates a GPS solution. By the way, hope you're celebrating the Kiwi A…

  in ADC Clock Frequency Correction via GPS Timing Comment by MikeR June 2017
• Hi John,Thanks for the rapid reply which adds a significant detail - the presence of a GPS solution signal in the FPGA.  I wonder if a combination of the GPS solution signal, the FPGA's PLLs and some logic could produce a desired ADC clock frequency…

  in ADC Clock Frequency Correction via GPS Timing Comment by MikeR June 2017
• Hi again John,Sounds like I can get by initially without connecting anything to the Kiwi GPS input.  If so I'll buy one and start playing! By the way, one of the things I like about the Kiwi is its multi-channel capability.  Standard marine HFs are …

  in NMEA0183 GPS input support Comment by MikeR March 2017
• Hi John,Thanks for your rapid reply.  I would like NMEA0183 capability since we already have several GPS devices aboard, some of which have externally mounted antennas and provide NMEA0183 outputs (and muxes - see below).  For example our chartplott…

  in NMEA0183 GPS input support Comment by MikeR March 2017