Tom, As long as the op amps behave like proper op amps, there should be no difference. I observe that the only place the power goes is to power the op amps - the calibration is used to set the op amp gains, so there should be no calibration dependency on the power supply voltage (unless the voltage gets very low).
One caution that I should mention - using a separate battery makes the meter independent of the grounding system for other powered equipment, so if you get 'funny' readings it may be due to ground loop currents coupling into the op amp inputs - of course you would have the same ground loop potential if you used a regulator to bring the 13.8 volts down to 9 volts. 73, Don w3FPR > -----Original Message----- > Does anyone know if the WM-1 can take 13.8 volts or do I need a 9 > volt voltage regulator. > > Tom > WB2QDG > K2 1103 > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
