This is the home page of Jarl Risum, OZ9MO


Emails to Jarl Risum may be sent to: jarl (at)




My experiments with home built test equipment :



GPS Controller for a LPRO-101 Rubidium frequency standard


LPRO -101 Rubidium standard with OCXO output stage


A multi-phase detector for evaluation of oscillator stability





Please note: If you follow the links above you will need Google viewer to open the (.pdf-) documents.

If you would like to see the pictures in better resolution and better colours: Command the Google viewer to full screen and from there download the original document. With this trick you avoid the heavy compression imposed by Google viewer.


Please also note: The information published on my home page is protected by copyright and may be quoted freely if due credit is given to the author. The author furthermore reserves all rights to commercial use of his designs.