>From what I understand, the meter is rated at 5% of the **full scale** rating according to Bird. Full scale rating, is the rating on the slug.
That would mean that for a meter with a 100W slug, your accuracy is +/- 5W (5%). So, if your wattmeter is reading 50W, the actual RF power could actually be 45 or 55 W.... 73 K1NR On Fri, 09 Dec 2011 09:08:55 -0500 Mike <[email protected]> wrote: > Wait. > > Using a 100W slug, if you get a reading of 100 watts, the > real power would be between > 95 and 105 watts, right? > If you get a reading of 50 watts the real power would > fall in a range of less than 45 > to 55 watts? > > Not if the 5% at full scale is the best accuracy. Or did > I misunderstand what you said? > > 73, Mike NF4L > > > On 12/8/2011 11:59 PM, Eugene Balinski wrote: > > The accuracy of Bird elements is typically +/- 5% of > the > > full scale value. For a 100 W Slug, that is +/- 5 > Watts. > > So theoretically speaking, with 5W in, and 0 > registered > > on the meter, the meter is still within its rated > accuracy. > > > > > > Additionally on the model 43 meter, there is meter > scale > > end compression. To get the most accurate reading, one > > would want to have the 5W reading at the middle of the > > meter range, which means that one would want a 10W > slug. > > Unfortunately I do not believe that Bird makes a 10W > HF > > slug any more. Perhaps they need an Elecraft W2 ?? > > > > 73 > > K1NR > > > > > > On Thu, 8 Dec 2011 16:47:27 -0600 > > Nate Bargmann<[email protected]> wrote: > >> > From my experience, trying to measure 5W with a 100W > >> element leads to > >> very inaccurate readings. The Bird is most accurate > when > >> the reading is > >> as near to full scale as possible. That means a 5W HF > >> element (is that > >> even available?) would be ideal provided no more than > 5W > >> is put through > >> the meter. A 10W element would be less accurate but > >> provide a safety > >> margin for the meter. Even better would be to have > both > >> elements and > >> use the 10W one to get in the ballpark and the 5W one > for > >> a final check. > >> > >> 73, de Nate N0NB>> > >> > >> -- > >> > >> "The optimist proclaims that we live in the best of > all > >> possible worlds. The pessimist fears this is true." > >> > >> Ham radio, Linux, bikes, and more: http://www.n0nb.us > >> > > > ______________________________________________________________ > 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 --------------------------------------------------------------------- Web mail provided by NuNet, Inc. The Premier National provider. http://www.nni.com/ ______________________________________________________________ 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
