Curious. I’m doing a lot of antenna work right now. I had to remove my 12/17/30m trap inverted V to get my beam off the tower.
In the meantime, I’m making due with a 20/40/80m trap dipole. If I use 12m on the 20/40/80m dipole using a tuner, I’m not having any HI CUR issues, even when running 100 watts. I think what I’m seeing is an RF in the shack issue. The 20/40/80m antenna feed point is about 70 feet further away than the old 12/17/30m antenna. > On Sep 5, 2020, at 10:41 PM, Bob McGraw K4TAX <[email protected]> wrote: > > I suggest you perform a TX Gain calibration using the K3 Utility. A known > accurate dummy load is all that is required. > > I’d say that a 1 volt drop is excessive. Check power cable connectors. Also > add a dedicated ground conductor between the ground terminal on the radio and > power supply ground terminal. > > The displayed voltage on the radio should be about 0.5 volt difference > between RX and TX, CW mode key closed. These measurements should be made > using a dummy load. > > 73 > Bob, K4TAX > > > Sent from my iPhone > >> On Sep 5, 2020, at 7:15 PM, Bill Coleman <[email protected]> wrote: >> >> I checked this. Voltage was 13.8 volts no load, dropped about a volt under >> load. >> >> I cranked it up to 14.4 volts no load, and it’s better, but still getting HI >> CUR indication above 90 watts. >> >>> On Jan 11, 2020, at 11:43 AM, Bob McGraw K4TAX <[email protected]> wrote: >>> >>> Is the power supply at 14 volts or so? And what does the radio show the >>> voltage to be in key down transmit into a dummy load. Low voltage will >>> demand more current to produce 100 watts. >>> >>> I run my supply at 14.25 V no load and the radio shows 13.8V during 100 >>> watts transmit. Voltage drop should be 0.5 volts or less. >>> >>> Bob, K4TAX >>> >>> >>> Sent from my iPhone >>> >>>>> On Jan 11, 2020, at 10:31 AM, Bill Coleman <[email protected]> wrote: >>>> >>>> Back in early December, I installed two KSYN3As in my K3 SN 7071. >>>> Sometime after that, I noticed that on 12m, I’m seeing a HI CUR indication >>>> when I set the power level to more than about 80-85 watts. The K3 will >>>> back off on the power level, then slowly ramp back up until it hits HI CUR >>>> again. >>>> >>>> I don’t remember seeing this before. After the KSYNC3A install, I ran the >>>> transmit gain calibration at both 5 and 50 watts, as specified in the >>>> instructions. Just in case something went awry, I ran it again. >>>> >>>> I’m still seeing this problem. What causes HI CUR at 85 watts? The K3 >>>> ought to be able to produce over 110 watts on 12m. >>>> >>>> I’m not seeing this issue on other bands. >>>> >>>> No issues with calibration >>>> Bill Coleman, AA4LR, PP-ASEL Mail: [email protected] >>>> Web: http://boringhamradiopart.blogspot.com >>>> Quote: "Not within a thousand years will man ever fly!" >>>> -- Wilbur Wright, 1901 >>>> >>>> ______________________________________________________________ >>>> 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] >>> >>> >> >> Bill Coleman, AA4LR, PP-ASEL Mail: [email protected] >> Web: http://boringhamradiopart.blogspot.com >> Quote: "Not within a thousand years will man ever fly!" >> -- Wilbur Wright, 1901 >> >> > > Bill Coleman, AA4LR, PP-ASEL Mail: [email protected] Web: http://boringhamradiopart.blogspot.com Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ______________________________________________________________ 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]
