Glad that helped, Steve. You might want to continue your troubleshooting, though. I use exactly the same Alinco DM-330MV power supply with the same stock Power Pole connectors that came with the K3, and while I have considered shortening the power cable that Elecraft provides I have not yet done so. I normally have my DM-330MV set for 14.5 volts per the earlier discussions here on the reflector about SSB linearity, but I temporarily adjusted the voltage back down to 13.6 volts in receive to match your conditions. With the K3 set to 95 watts, I show 13.0 volts in transmit. At 45 watts, I'm holding 13.3 volts.
I'm not sure what the difference might be, but we're getting significantly different results from the same power supply. For what it might be worth, I carefully soldered the connections between the cable and the Power Pole connectors when I assembled it. 73, Dave AB7E S Sacco wrote: > Hi Dave - > > OK, sorry for the misunderstanding; I thought you were talking about > the K3's internal battery. > > Now that we have that out of the way: > > 1) "BAT MIN" is set to 11.0 v > > 2) When I measured the voltage using the K3's internal metering: > a) It was 13.6 v at receive > b) It was 10.8 v while transmitting 95 watts output **** Clearly, > 10.8 < "BAT MIN" **** > > 3) I measured disconnected and reconnected the Anderson Power Pole > connector at the back of the K3, and the voltage increased to 10.9. > > 4) I have the power from the power supply (an Alinco DM-330MV) running > to a set of fuses before continuing on to the K3. It's one of those > gold-plated dressy looking deals that car audio folks use to bling-out > their installation (I got them cheap at Skycraft Surplus here in > Orlando about 10 years ago). > a) I removed both fuses (one for +, one for - ) and treated both > the fuse and the holder with DeoxIT. > b) At the same time, I treated the PowerPole with DeoxIT. > c) I also noted the the - lug on the back of the Alinco was > slightly loose, so I tightened it. > d) My apologies for not doing one thing at a time, and then > measuring the result; that would have been the proper procedure. > e) Upon the above treatment and actions: > i) The voltage rose to 13.7 v at receive > ii) The voltage rose to 11.4 v while transmitting 95 watts > iii) To add another datapoint, I reduced the power to 45 watts > (typical power when driving my amp) and the voltage was 12.0 v. > > Conclusion: Voltage drop due to I squared R losses. > > I didn't measure the voltage on both side of the fuses before the > DeoxIT treatment, which was another mistake in my diagnostic > approach. I did so after the treatment, and noted a voltage drop of > only .1 volt (from 12.9 to 12.8) across the fuses while under load. > > Thanks for the tip Dave; it was much appreciated! > > I've Cced the reflector, and hope this serves as a good example for > everyone to mind their connections. > > 73, > Steve > NN4X > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
