"Bryan, ZL1NI" <[email protected]> Wrote Subject: [Elecraft] K3 High Current Warning on 10m To: [email protected] Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 28.010 while in Tune a high current warning came up then a 15A fuse went in my Astron power supply. My MFJ-259 shows SWR less than 1.5 at this frequency. The antenna is a new SmallIR. I have since operated my FT-897 on the same antenna and frequency. I can key down at 100W as often as I like and for as long as I like and nothing bad happens. Rig indicates a low and stable SWR putting out 100W. This seems to suggest something related to the K3. Has anyone else experienced this? Hi Bryan, This is caused by the supply voltage at the K3 being below 13.8 Volts because of the current being drawn to provide the RF power out on the higher frequencies. The K3 will draw a higher current to try and put out the higher power thus compounding the problem. The voltage drop can be due to using wire that is too thin, oxidised connectors and that includes the fuse connectors or a power supply with insufficient capacity or poor regulation. I would try measuring the voltages when keying say 50 Watts. Measuring the drop along each wire of the cable should show where the problem lies. Regards Malcolm G0MIC ______________________________________________________________ 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
