After almost 2 years of use, I finally decided to install some of the mods. All was well after installing the first few mods. RX/TX full power, etc. However I did not do any of the calibrations. Tonight I installed the last mod that I was going to do at this time. Should have stopped earlier. The mod I installed last was the "Improving the Immunity of the Rear-Panel RS232 and Audio Connectors to RF" mod. The one that jumpers out the RFCs. Well, it went well. I put jumpers on L3, L5, L8 and installed the Microphone Choke bypass jumper on the REV XD Audio I/O module. Then I put a jumper on L1 on the Remote I/O module. Put the K3 back together and started testing.
COMMENT: The only mods that I put in had to deal with removing the bottom front cover and the I/O modules. NONE that required removing the front panel or KRX3. The Synthesizer mod was already in (for weeks). I put it all back together and the RX was fine. Did not try to XMIT. That worked fine last night and I did not do anything that had anything to do with XMIT. I thought. I then decided to do all the realignments. I started with the TX Gain. The 5 w part worked GREAT. The 50 watt part failed with an ERR TXG in VFO B. Since then - - I reloaded the firm ware: 3.79 - did nothing I loaded an old version as I never did the TX Gain calibration with this rev firmware: did nothing I tried to calibration with my other K3 on the current 3.79 firmware - worked fine I then did a save from my good K3 and loaded the config in my 'bad' K3 - did nothing I took the bad one apart to see if there was anything I could see that was wrong - NOTHING VISIBLE I put it all back together and tried the manual TX GAIN - not using the GUI - the 5 watt worked fine / the 50 watt failed at about 6 watts again with ERR TXG in VFO B I then decided to try the Synthesizer calibration just to see if anything else did not work. That worked fine. According to the manual ERR TXG indicates the gain constant is "out of range". Not sure what that means or what to do next. The book also suggests that the problem could be related to a band-pass alignment or one of the low pass filters. So, I tried the manual alignment on all bands (160 - 10)- CONTINUED TO FAIL with roughly 5 - 7 watts showing in VFO B display area. The ONLY thing I did in the 100w amp area was to install the diode for 12v sense. I already tried removing that ... no change. My Config: 3.79 and all associated other same rev firm ware K3/100 - 2.7, 400,250 filters KRX3 KAT3 KXV3 - 2.7 filter Suggestions? 73, Bruce - N1LN K3 # 1062 (QRP only) K# # 1193 (working fine) ______________________________________________________________ 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
