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Unfortunatelly, DCF77 module cost more than GPS module here... As GPS module does not really work inside building, I'm trying to make my own DCF77 module with hand made antenna to acquire precise time.
Currently I have no oscilloscope nor LC meter, just frequency counter. That should be sufficient...
I have actually wired antenna from 0.2mm magnet wire and some unknown iron rod possibly salvaged from some old AM radio.
The rod is around 5cm long and have diameter around 0.5 cm.
The antenna should have around 5mH and 1000pF (5% MKT) in parallel LC tank basic circuit should be sufficient to tune desire 77.5KHz, decreasing or increasing number of turns. It is impossible to make any reasonable calculation for number of turns since composition of the rod is unknown.
If measure frequency with this simple LC tank circuit, would it be necessary some protective measure or it is simply enoug applying regulated 3.3V or 5V directly in order to provide accurate reading?
Thanks.
Currently I have no oscilloscope nor LC meter, just frequency counter. That should be sufficient...
I have actually wired antenna from 0.2mm magnet wire and some unknown iron rod possibly salvaged from some old AM radio.
The rod is around 5cm long and have diameter around 0.5 cm.
The antenna should have around 5mH and 1000pF (5% MKT) in parallel LC tank basic circuit should be sufficient to tune desire 77.5KHz, decreasing or increasing number of turns. It is impossible to make any reasonable calculation for number of turns since composition of the rod is unknown.
If measure frequency with this simple LC tank circuit, would it be necessary some protective measure or it is simply enoug applying regulated 3.3V or 5V directly in order to provide accurate reading?
Thanks.
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