Bill, The 25H element was special-ordered thru Radiodan W7RF <<mailto:rfpo...@radiodan.com>rfpo...@radiodan.com>, who has the ability to run NBS traceable calibration, so with no better reference, I am taking the readings on the new element as accurate (and my standard for HF). A little late to save me money on Bird elements as have 16 ranging from 5w to 2500w, and HF to 1800-MHz. If I had the cash it would be nice to send meter and elements to Dan for calibration.
A note that may be of interest: I ran the wattmeter calibration on my K3 and setting 5w to accurately output 5w as indicated by the Bird 25H required changing my WTMR LP setting from 70 to 50. I then ran the Transmit Gain Calibration and have 12.5w indicated output from 160m-10m. On 6m the 25H is out of freq. range so reads low, but I have both a 5A and 50A element that indicates I'm getting close to 8w. I will be interested to see what the output of my new 300w amp runs at these levels (previously getting 270w with 11.5w; Bird 500H). I was getting 125w out on 6m with my Mirage A1015G. The Harris Platinum Amp should provide 10-dB (800w) on 6m. ---------------------------------- Date: Tue, 13 Mar 2012 04:39:11 -0700 (PDT) From: Bill W4ZV <btipp...@alum.mit.edu> Subject: Re: [Elecraft] K3: RF Calibration / RF output To: elecraft@mailman.qth.net Message-ID: <1331638751450-7368184.p...@n2.nabble.com> Content-Type: text/plain; charset=us-asci Edward R. Cole wrote > I obtained a brand-new calibrated 25H element for my Bird43 power > meter, today. I checked power out on my K3/10 set to 12.0w. > 80m = 11w > 40m = 11w > 20m = 11.5w > 15m = 11.5w > 10m = 11.5w > all measurements into a Bird 25w coaxial termination Bird accuracy is +/-5% of full scale (25W for your slug) or +/- 1.25 Watts, so the above is within spec. If you want better accuracy, consider the LP-100A which is +/- 5% of reading. At 12 Watts, this would be +/- 0.6 Watts or twice as good as a Bird...and probably cheaper as well considering the cost of a comparable set of slugs. http://www.telepostinc.com/lp100.html 73, Bill 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? DUBUS Magazine USA Rep dubus...@gmail.com "Kits made by KL7UW" http://www.kl7uw.com/kits.htm ====================================== ______________________________________________________________ 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
