reference locking for amateur radio communications devices
H18-004 committed to mfr 8 September 2018
redesigned to make manufacturing cheaper - 2 layer 1mm FR4 board with 0603 parts, mostly.
This unit is for radios with reference oscillators that can be pulled. (There is another Locker- H18-006 which is a DDS based device that can accept 1pps or 5 to 15 MHz. (nom 10M) )
Uses ADF4157 fractional N synthesiser to deal with very low highest-common-factors such as locking a FT-1000 10.485760 MHz to 10MHz.
50mmx30mm x 3mm.
Ample solder-blob jumpers to deal with input options.
USB interface for programming and configuration.
free run of existing TCXO when external provided reference not present
LED multi status indicator .
Handles variety of internal reference amplitudes with on board amplifier for < 100 MHz inputs .
Requires >= 100mV ptp reference input 5 MHz to 150 MHz (10 MHz nominal)
Low loop filter BW preserves existing internal reference noise performance and excludes fractional spurs.