The three screws with internal toothed lockwashers referenced by Terry, W8ZN insert into standoffs on the RF board through the heat sink tabs of RF power MOSFETs Q2, Q4 and Q5 on the LPA board. Tighte

Terry – I looked on the bottom of my K3S to tighten these screws, and I only find 2 screws with lock washers and one empty hole. This kind of worries me, as I regularly run full power. Is the K3S diff

Thanks for the info, Terry! I've already recalibrated to be safe. Perhaps that is why my 50w calibration failed into a dummyload previously. I had no issues this time. I'm lucky to have gotten this re

I've seen this on several K3's. What's worse is if these screws come loose, it can and will blow the driver transistors. It will also cause the high power calibration to fail. To be clear, these are t

Thanks, Mike. I am already making some awesome contacts! Thanks again for the help. Kind regards, Elijah.

Congratulations, Elijah - Keith knows all the common problems with the K3/K3S lines. Glad that the issue is behind you and you can enjoy that radio! 73, Mike, K8CN

Update for everyone, after emailing Keith, WE6R, the issue seems to have been resolved. It appears that the issue arose from a ground issue of the LPA. There were loose screws on the bottom of the K3

Hi Jeff. I cannot resolve your email addy. You can email me at ve7fmn@... or text to my phone at 16o48I99BB6 Change the letters to the nearest looking number I have a KPA500 that goes together w

Try the freeze spray in the area of the two regulators. There are chip capacitors located around them. Dale K9VUJ

Hi Mike, I'm not entirely sure what you mean. The ALC seems to be acting fine below 12w (IE when the KPA3 is disengaged), my point was that the power deviation when the KPA3 is engaged, can drop below

Hi Elijah, I now doubt that the problem originates in the T/R switch. The ALC behavior you describe at lower TX power settings, especially when the KPA3 power amp is bypassed for power settings below

Thanks Dale. I had thought the same thing and I have removed and re-seated both ends of the ribbon cable several times. That had no effect. I pulled out the IO board when I resoldered C503 and inspect

Thank you for the reply. Yes, my other P3 works fine with the transverters. I considered the invert and even changed it, but the P3 should show the IF trace, just tune in the opposite direction. All t

Hello again, I forgot to answer some of your questions... Glad to hear the power fluctuations are likely from the ALC circuit. At 60w of power, I can sometimes see a deviation of 30-40w. It's hard to

Thanks for the response, Carter, Thanks for the input, though I am a bit confused. You said you don't advise me to remove every T/R switch component but you also want me to test them in isolation? Per

All parts are alike but some are different. That sounds like nonsense but the nonsense is not mine. It is the industry's nonsense. JEDEC (www.jedec.org) was the first industry attempt at standardizati

I wonder if the problem could have to do with the K3 setup? For example, does the K3 frequency display show the correct transverter frequencies? Another possibility is that the P3's "XV Invert" menu i

Can I ask this question in this forum? I acquired a P3 with a SVGA card in it. I have another P3 without the SVGA card that I will now repurpose. My issue is that with this newly acquired P3, I can’t

Hi All. Has anyone in the UK got a MicroHam MicroKeyer 3 DB-37 Cable Set for The Elecraft K3 Transceiver to save me ordering one from MicroHam direct. Here's hoping... James

contact me offline at: jacantor9@... Jeff / K1ZN