Hi All
Email support from Elecraft is very slow since about the beginning of 2019. May be due to a system change. Before it was really good! I own equipment ( 3xK3S, 3xP3, 1xKPA500 etc.) Therefore I turn to this group to be able to fix my K3S TX by myself. Sending the unit for repair to Italy is no option because of crazy VAT there ( HB9 no EU). How is your equipment operating ? K3S # 10490 factory assembled is now not TX working at all, based on IMD 3 (24dB, basically on all bands) and too low output problems. I try to troubleshoot/repair it and need further supporting technical info. I took out the 100W PA , replaced it with an older K3 module I had -> no improvement. If only running the 10W module the IMD is bad and I have only limited output. Analyzing the output from XVERT out BNC the signal is clean and about 1mW/50Ohm. 1) It would be helpful among others to receive info on the DC voltages ( Bias etc.) in the 10 and 100W module. In order to analyze the bias voltage/ current technical info is needed. 2) Is there any good way to check the QSK diodes? I want to make sure the diodes are working well. Should I replace them? I did measure it at XVTR OUT BNC. Output level about -1dBm to 0dBm into 50 ohms. Turning on the 2 Tone (Tech MD on ) and watching on the spectrum analyzer HP 8591E ( all functions auto/ cal. ok) with 10 dB 50 Ohm external attenuator shows a signal (2 Tone) which looks very clean down to at least 45 dB to almost 50dB on each side. Basically there is no difference on 160 or 80m or 40 . I can however not see expected side products (IMD3) here. May be the signal is just very good here ( Span e.g. 10kHz, sweep 10 sec) . In all measurements the LPA was set to about 11 watts connected to 50 Ohm DL anyway-probably disabled by SW . After resetting KXV3B to normal IMD3 at PL output -no 100W engaged - very bad again with about 10dB worst case. My conclusion there is again a problem in the new LPA (10W). What is your analysis? When I happily replaced the 10W/100W module last year (based on returned old once later , nice service!) all looked fine and then back to same problem. Thanks for any hints from the group . Cu, vy 73 Andy HB9CVQ, DK2VQ, AK4IG <https://www.qrz.com/db/HB9CVQ> https://www.qrz.com/db/HB9CVQ ______________________________________________________________ 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
