Graham: I think what Joe and others have tried to tell you is your power lead represents a variable and until you properly account for the variable voltage drop in your power lead comparison is meaningless. You say power lead appears to be OK. Appears??? How did you come to that conclusion? If you placed your hand on the cable and said it is not hot and therefore concluded the cable appears OK you have again missed the point. At low voltages (and high currents) the quality of the cable (and connectors) is determined by the voltage drop. Additionally the voltage read on the front panel is read through a poly fuse which has a voltage drop that is greater than the voltage seen by the 100 watt amplifier which is alternatively feed through a 22 amp circuit breaker. The current that passes through the poly fuse is further regulated down to 5 volts so the voltage drop across the poly fuse is immaterial but it does represent an insignificant error that the 100 watt amp does NOT see. Ergo where you measure your voltages is all important to your pass/fail calculations.
What to do? Measure the voltage at your power supply and then again at the K3 circuit breaker. If the difference is more than 0.5 volts I would use a heaver power lead. 73, Fred, AE6QL -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of G4FNL Sent: Sunday, March 08, 2015 4:24 AM To: 'Robin Moseley'; 'Elecraft Reflector' Subject: Re: [Elecraft] K3 voltage indicator Guys I may need to re-enforce my power lead and connections - but they appear OK. What I was asking was what does the voltage display indicator show on your K3 - when compared to mine? I have since understood that the voltage drop that I see (at the 3 power settings mentioned) is about normal...... 73 Graham G4FNL ______________________________________________________________ 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]
