I've eliminated the power supply as the problem. Tried three different ones and see the same issue (long shot anyway... I use high quality supplies). I did remove the 100W module and everything works perfectly fine, so the problem is confined to the LPA3... The fact that I can't calibrate the gain at 50W (fine at 5W) tells me I may have a bad transistor. Ordered a fist full of transistors... will take the module back to the USA and put it on one of my RF bench at work to diagnose it further. Also have a spare LPA3 if all else fails.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ email: [email protected] -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Bob McGraw Sent: Friday, February 4, 2022 10:07 AM To: [email protected] Subject: [POSSIBLE SPAM] [Elecraft] HI CURR indicator on K3S display Well clearly one of the indications, radio or power supply, is incorrect. Just checked mine: TX @ 100 watts, radio display = 18.3 amps, Power supply = 19.0 amps. Voltage: Radio RX = 14.3, PS = 14.5. Voltage: TX Radio = 13.9v, PS =14.5v If the power supply voltage drops during TX, the control circuit will attempt to produce 100 watts in which the current may increase. Also, different bands at 100 watts will draw different amount of current during transmit. I actually found with a 100 watt power setting on the radio, the actual output power was more than 120 watts. (See the discussion on Power Calibration). This would of course affect the current demand. 73 Bob, K4TAX On 2/4/2022 2:16 AM, [email protected] wrote: > Message: 4 > Date: Tue, 1 Feb 2022 18:12:38 -0600 > From: "Dr. William J. Schmidt"<[email protected]> > To:<[email protected]> > Subject: [Elecraft] HI CURR indicator on K3S display > Message-ID:<[email protected]> > Content-Type: text/plain; charset="us-ascii" > > I remember some discussion about HI CURR issues and the causes here a > while ago. I just noticed it on my radio.. Changing the display to > read amps, it indicates 21.6 amps, but the amp meter on the power > supply is only showing > 10.1 amps. The radio sensing circuit seems to be in error. Anyone > else delt with this? > > > > > > Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ > PJ2/K9HZ VP2EHZ ______________________________________________________________ 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] ______________________________________________________________ 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]
