> If you want cheap, use 6 12V to 9V DC-DC converters from old thin > ethernet cards with the outputs in series! This will give 54V. You > also get the isolation transformers and 10MHz filters see G4HUP's page > http://g4hup.com/DA/10MHz%20Distribution%20Issues.pdf
I don't see how that will work. They can't provide enough power. The paper above says the little bricks put out 9V at 200 mA, 1.8W. 6 of them will total 11W. My copy of the Z3801A manual says "< 25 Watts (nominal)". I'm a bit surprised HP didn't mention the startup requirements. Google found a graph at the bottom of: http://www.realhamradio.com/z3801a-power-supply.htm It shows a measured 0.85A at 47V during startup. That's 40W. It drops to 35W in a few minutes, then gradually ramps down to 32W over a half hour and drops to 20W after an hour. (The text on the graph is tiny. I might have misread something.) I don't know what the startup power looks like at the sub-second level. That extra 15 W probably explains most of the startup troubles that have been reported. I'm using a way-overkill 48V regulated supply and I haven't noticed any troubles. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
