On Fri, 2005-06-03 at 08:12 -0700, Darrell Bellerive wrote: > I am wondering about backup power for a K2 based station. > > The configuration would be a K2 with KBT2 and a KPA100 built into an EC2. > > One AC Powered 24 amp continuous/30 amp maximum power supply running both > plus > a few minor station accessories. > > If the AC mains fails will the KBT2 continue to power the K2 at QRP levels? > From reading the mailing list archives and looking at the schematics this > seems to be the case, but just wanted to check to see if this was indeed the > case. > > I would like to set the power supply voltage to about 14.2 volts or so to > keep > the proper float voltage on the KBT2 battery. I assume that the higher > voltage will not be a factor for the KPA100. Am I correct? > > Lastly, I would like to power the few station accessories from the KBT2 > battery to keep them running in the event of a AC mains power outage. They > are low current devices so they shouldn't impact the battery much. I would > also like them switched on and off with the K2 front panel power switch. Is > there a convenient place in a K2 to pull off the switched 12 volts and feed > it to a rear panel connector? > > TIA and 73, > Darrell >
Darrell, The KPA100 manual says the supply voltage should be between 11 and 15 volts (13.8 volts nominal), so 14.2 volts shouldn't be a problem. The anode of D12 (large SB530 diode) should be an easy place to attach a lead for obtaining switched 12 volts. 73, Bob N7XY _______________________________________________ Elecraft mailing list Post to: [email protected] 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
