The NTBW50AA (and most other telecom GPSDO's) will run on 48V. This will solve your problems for dirt cheap. They are very high quality industrial/medical supplies (not cheap junk wall-warts) that currently sell from distributors for over $80. http://www.bgmicro.com/48v-2-08a-enclosed-power-supply-by-xp-power-2-5mm-right-angle-barrel-connector.aspx