Hi, all. I built my KFL1-2 as a 12m/10m board.
I thank Stephanie VA3UXB for his suggestions on component values. Values of components I used are as follows: Band 1: 24.8MHz C1, C5 - 100 C2, C4 - 47 C3 - 1 C11, C15 - 270 C12, C14 - 33 C13 - 2 C21, C23 - 68 C22 - 150 L9, L10 - 0.26uH (T37-6 yellow core; 8turns, 16cm) X1 - 32.8000MHz (fundamental) Band 2: 28.0MHz C6, C10 - 82 C7, C9 - 47 C8 - 1 C16, C20 - 220 C17, C19 - 33 C18 - 2 C24, C26 - 68 C25 - 150 L11, L12 - 0.26uH (T37-6 yellow core; 8turns, 16cm) X2 - 36.0000MHz (fundamental) Additional modifications as Stephanie did: On Sun, 1 Jan 2006 12:57:13 -0500, Stephanie Maks <[EMAIL PROTECTED]> wrote: >Subject: [Elecraft] 10 meters on K1 - component values >#1: 220pf capacitor added to filter board, on the top side, on P2 >between pins 7 and 8. This could also be done on the RF board, at >pins 7 & 8 of J7. I had more clearance though on the filter board. > >#2: On the RF board, R11 has been changed from 82 ohms to 33 ohms, >to increase the gain of the Buffer. I added 56-ohm in parallel with R11 (82 ohms). >#3: On the RF board, T3's turns have been compressed as tight as >possible. The windings now occupy about 130 degrees of the core. >Experimentation showed that the tighter the windings, the higher the >output on 10 meters. This did not seem to affect the other bands at >all, i.e. no noticable effect even down at 80 M. Next time I feel >like experimenting, I might try rewinding T3 to make it even tighter. In additon to above mods, I added a 0.001uF capacitor in parallel with R30 on the RF board. My K1 got the output power as follows: 24MHz = 7+ watts @ 13.8V 28MHz = 4 watts @ 13.8V VFO range must be "150kHz", not "80kHz". The 12-meter begins from 24.890MHz but K1 covers this band starting 24.800MHz. Best Regards, harry -- Akinori Harry SHIBATA, JL3AMK http://jl3amk.net/ http://jl3amk.org/ Elecraft K1/Mod (160-10m CW 5W) & KX1 (40-20m CW 4W) + Whip Antenna A1C#311 FISTS#15002 G-QRP#11804 NAQCC#540 QRP-ARCI#12260 RU-QRP#110 _______________________________________________ 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