Eric; Here’s what I submitted to Howard from Elecraft a few minutes ago:
Howard: I performed the tests using an MFJ Model 260C Dummy Load with less that a foot of RG-58 coax to the Antenna 1 output of the K3. Here are the results you requested: Freq. 3930 KHz Tuner bypassed: VSWR=1:1 Auto Tuner engaged: VSWR = 1.1 Freq. 7200 KHz Tuner bypassed: 1.1 Tuner engaged: 1.0 Freq. 10100 KHz Tuner bypassed: 1.1 Tuner engaged: 1.0 Freq. 14200 KHz Tuner bypassed: 1.1 Tuner engaged: 1.0 Freq. 18120 Tuner bypassed: 1.2 Tuner engaged: 1.0 Freq. 21200 KHz Tuner bypassed: 1.3 Tuner engaged: 1.1 Freq. 24950 KHz Tuner bypassed: 1.4 Tuner engaged: 1.0 Freq. 28300 KHz Tuner bypassed: 1.7 Tuner engaged: 1.1 Freq. 50100 KHz Tuner bypassed: 1.1 Tuner engaged: 1.1 I repeated the tests above with the same stub of coax, same dummy load but in series with the wattmeter in a Palstar AT2KD. The indication on the Palstar was always 1.0 VSWR with the K3 tuner in bypass mode in all tests. Power level for measurements was 15 watts in all cases. The MCU in my K3 is 05.38, FPF is 1.25, DSP1 is 2.86. Please update my records from KP4GE to my new callsign: NQ9V. My K3 and P3 have been performing flawlessly until I noticed the variation in the VSWR display. I also ran the transmitter gain calibration this morning using the same dummy load. Here is the transmitter calibration summary: K3 Tx Gain Calibration data written on 2016-05-06 at 16:22:43 K3 Serial Number 04416 K3 MCU revision 05.38. RS-232 speed 38400 bit/s. Elecraft K3 Utility Revision 1.15.12.7 1900 kHz TxGain LP 15 3750 kHz TxGain LP 11 5336 kHz TxGain LP 18 7150 kHz TxGain LP 14 10125 kHz TxGain LP 18 14200 kHz TxGain LP 08 18110 kHz TxGain LP 08 21200 kHz TxGain LP 05 24930 kHz TxGain LP 07 29000 kHz TxGain LP 07 52000 kHz TxGain LP 10 1900 kHz TxGain HP 25 3750 kHz TxGain HP 30 5336 kHz TxGain HP 48 7150 kHz TxGain HP 36 10125 kHz TxGain HP 36 14200 kHz TxGain HP 16 18110 kHz TxGain HP 11 21200 kHz TxGain HP 05 24930 kHz TxGain HP 03 29000 kHz TxGain HP 08 52000 kHz TxGain HP 04 Ramón E. Tristani Sr. [email protected] <mailto:[email protected]> https://www.flickr.com/photos/nq9v/ <https://www.flickr.com/photos/nq9v/> www.tristaniministries.org <http://www.tristaniministries.org/> www.tristaniphotography.com <http://www.tristaniphotography.com/> > On May 6, 2016, at 5:10 PM, Ramon Tristani <[email protected]> wrote: > > Yes, I performed tests with and without the ATU in the circuit. Howard, from > Elecraft Support contacted me off the list and requested information that I > just sent to him. > > Thank you, > Ramon, NQ9V > > > Ramón E. Tristani Sr. > [email protected] <mailto:[email protected]> > https://www.flickr.com/photos/nq9v/ <https://www.flickr.com/photos/nq9v/> > www.tristaniministries.org <http://www.tristaniministries.org/> > www.tristaniphotography.com <http://www.tristaniphotography.com/> >> On May 6, 2016, at 3:06 PM, Eric Swartz - WA6HHQ, Elecraft >> <[email protected] <mailto:[email protected]>> wrote: >> >> Is the K3 ATU in bypass? >> >> Eric >> elecraft.com <http://elecraft.com/> >> >> On 5/6/2016 11:26 AM, Don Wilhelm wrote: >>> Ramon, >>> >>> There is a calibration procedure in the manual to calibrate the wattmeter >>> for forward power, but not for SWR. >>> I suggest you contact K3support for further assistance. >>> >>> 73, >>> Don W3FPR >>> >>> On 5/6/2016 11:50 AM, Ramon Tristani wrote: >>>> The VSWR indication in my K3 seems to be off considerably when connected >>>> to a 50 ohm dummy load. An external VSWR meter indicates 1:1 while the K3 >>>> most of the time indicates readings varying up to 2:1 at times. I am using >>>> the same short coax stub to connect the instruments one at a time to >>>> eliminate other possibilities. Is there a way to “calibrate” the VSWR >>>> indicator in the K3? My K3 is serial number 4416. The Auto Tuner in it >>>> works fine and reduces the indication to 1:1 as it is supposed to but when >>>> bypassing it the VSWR indication will always be off. Any suggestions? >>>> >>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> <http://mailman.qth.net/mailman/listinfo/elecraft> >>> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm> >>> Post: mailto:[email protected] <mailto:[email protected]> >>> >>> This list hosted by: http://www.qsl.net <http://www.qsl.net/> >>> Please help support this email list: http://www.qsl.net/donate.html >>> <http://www.qsl.net/donate.html> >>> Message delivered to [email protected] >>> <mailto:[email protected]> >> > ______________________________________________________________ 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 Message delivered to [email protected]
