On 5/31/2010 6:59 AM, Alexey Kats wrote: >>> Anyway... I know that older version of K2 manual refers to changing >>> winding of T4 transformer to 2:2 (instead of original 2:3) in order to >>> increase efficiency of CW performance on 5W or less.
Keep in mind that the 25% decrease in current draw applies only when the key is down. Assuming that you are operating in contest mode and running stations you may be transmitting half of the time. During the time you are transmitting the duty cycle will be about 50%. So the key will be down a maximum of 25% of the time (and if you are doing search-and-pounce, as you must as a QRP contester, it will be significantly less). So you have a 25% improvement x 50% transmit time x 50% duty cycle, which translates to only a 6.25% reduced current draw overall. Of course if you are operating casually, listening and ragchewing, the improvement will even be smaller. Is it worth permanently crippling your K2 so that it cannot produce the 10-15 watts it is capable of making, and which in some circumstances you might be happy to have, for this small improvement? I've never understood the enthusiasm some have for this modification. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
