You might look at the “QRP” baluns from Balun Designs. They are designed for 250 W and cost about $50. Excellent design and construction.
http://www.balundesigns.com/low-power-qrp-baluns/ <http://www.balundesigns.com/low-power-qrp-baluns/> wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On May 26, 2016, at 6:04 PM, jso...@comcast.net wrote: > > Hello, > I'm contemplating buying the BL2 balun. > It would be connected to 450-ohm transmission-line, which would go to a > version of W1AB's "killer-antenna", sized for 20m on a 31' jackite-pole. > > A reviewer of the BL2, on eham five years ago, commented about heat and > signal-loss. > The heat and signal-loss concern me, not at the QRP-level but higher wattage. > I realize it is spec'd at 250 W but how hot does it get? > > I've looked for data about insertion-loss for the BL2 and came up short > there. > Hopefully someone has measured the insertion-loss and could share that data. > > The "elecraft BL2 assembly and operating manual" has the cores as ferrite > material. > But ferrites exhibit non-linear properties, so the loss may be a function, > not only of frequency, but also drive-level. > Insertion-loss shows up as heat and that heat affects the properties of the > ferrite. > > As I wrote above, I'm not concerned about QRP operation. > If I put it into operation on FD and but take my KX3 home for the day, what > happens if a club-member connects his 100+ W rig to the antenna-system to > operate thru the night? > TIA for any reply. > > 73 Jerry KM3K > KX3 #6088 > ______________________________________________________________ > 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 > Message delivered to wun...@wunderwood.org ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
