Thanks, Bob. I'm going to go with the A&A QRP Switchable QRP Smart Battery Charger and the W3FPR mod to directly connect the battery to the charger.
The A&A is almost the right size, and I get to control the charging current rate. 73 de Dick, K6KR -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Nielsen Sent: Saturday, November 17, 2007 1:38 PM To: Elecraft Support List Subject: Re: [Elecraft] [K2] KBT2 Battery charger/power supply recommendation? I looked around and couldn't find any small 14.0 volt switchers (I did find a reference to one but it apparently has been discontinued). I use a MFJ-4103 with my K2, but it doesn't put out quite enough voltage to charge the battery. It uses a standard desktop computer power cord and works fine with 240v input. I use a small linear supply in the shack and have adjusted the output accordingly. There are some 15 volt switchers for laptops available and maybe a series diode or two would do the trick, depending on the actual output voltage. Most of these are sealed assemblies and not easy to modify internally. Bob, N7XY On Nov 17, 2007, at 10:45 AM, Dick Dievendorff wrote: > I have a 10-watt K2 with the KBT2 installed. The KBT2 manual > recommends a > 14.0V power supply or battery life will be "reduced". It's easy to > put my > K2 on my station's 12V supply (which is really about 13.6V), but I > seek a > small switching power supply that I can adjust to 14V to power my > K2 in the > field and keep the internal battery topped off. I have a Gamma > Research > HPS-1A which is ideally sized, but I can't adjust the output > voltage (and > the filter caps are operating very, very close to their rated > voltage). > > > > I thought of a Ramsey Kits LABC1 with a 20V wall wart, but I > suspect it > would be electrically too noisy to consider. I could charge the > battery with > it, but not while operating any radio in the near vicinity. > > > > So I need a 14V DC 2A battery charger that's electrically quiet. > Are there > such things? > > > > 73 de Dick, K6KR > > > > > > > > > > > > _______________________________________________ > 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 > _______________________________________________ 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 _______________________________________________ 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
