Wayne: There's also an SWR versus output power issue, or is that part of the first correction factor? The SWR error increases significantly at lower power. I have not had a chance to plot the data because it was not part of the original question, but there is a clear power related error seen in the raw data, which I assume is tied to the detector diode linearity at low voltages.
Jack K8ZOA Wayne Burdick wrote: > There are two sources of the reported SWR inaccuracies: > > - An SWR calculation scalar that I'll be adjusting in firmware; this > is what's causing a 2:1 SWR to read closer to 1.8:1 on some K3s. > > - The KAT3 itself, and to a much lesser degree, the KANT3, which is > present if the ATU is not installed. Both modules have inherent stray > reactance, part of which is due to the 8.2 MHz first-IF trap. These > strays slightly alter the impedance seen by the K3's SWR bridge. > > Even when the scalar correction is applied, there will still be a > small frequency-dependent variation in SWR reading between the K3's > bridge and an external instrument. This has no impact on K3 operation. > > 73, > Wayne > N6KR > > > ______________________________________________________________ > 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 > > ______________________________________________________________ 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
