Glen VK1XX has designed a new XRef type board so you can frequency lock your transceiver with a 10 Mhz locked reference source such as a Rubidium or GPSDO, which is a requirement for doing weak signal digital modes such as WSJT, FT8, WSPR etc. See Glen's blog below for details.
I am keen to see Glen's next project which will use a 1PPS reference as the lock source, which means using any of the cheap ~$5 GPS boards on Ebay such as Ublox Neo series or Telit JF2 boards that provide a 1PPS output from the GPS. Its easier to distribute a 1PPS to multiple Xref disciplined transceivers, as I wish to run multiple bands ie. 6,2,70 & higher.
https://glenenglish.com/2018/05/12/new-anylocker-radio-reference-locking-board/
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