Before you reach a decision on battery packs, be sure to read Wayne's Tech Note at http://www.elecraft.com/TechNotes/k1_battery_op.htm
Basically, the principle of impedance matching applies to both input and output of a rig. A DC input mismatch results in waste heat, which is usually not a problem unless the DC is in limited supply, e.g., from a battery. My particular K1 tends to drift a bit more when its regulators have to dissipate extra DC input voltage as heat. The second regulators in the K1 put out about 6.3V, so an input of 14.3V results in twice as much wasted voltage in the regulators as an input of 10.3V, i.e., four times as much wasted heat to cause more drift. For battery supplies, I prefer packs of 8 AA NiMH cells. Alternatively, I use a variable AC supply which I set to 10V (plus an extra 0.3V that doesn't make it to the K1's voltmeter). Either of these supplies matches my preferred 4W output setting fairly well, according to Wayne's note. 73, Paul W8TM ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
