Don, I think that the voltage drops to 13 V or lower at key down. I will follow your advice. Thanks again.
73, Ioannis PA1EQP On Monday, 25 April 2016, Don Wilhelm <[email protected]> wrote: > Ioannis, > > Back the CAL CUR down to 3.50. > It may be that you will have Hi Cur messages if you turn the POWER knob to > full clockwise, but if you set the power control at 100 watts, that message > should not appear. > > If it does, check the connections from the power supply to the K2/KPA100. > If the voltage at the K2 (observe with the K2 voltage display) drops > significantly during keydown, that could explain the Hi Cur warnings. > Tighten the power supply terminals and check to be certain the APP > connector is properly assembled with the connector blades fully inserted. > If you look at the end of the APP connector and can see the spring blades > that normally lock the contact blade, the contact blade has not been fully > inserted and will not make full contact (and cause a significant voltage > drop). > If you can increase your power supply voltage to 14.3 volts or above, you > should increase the voltage. The K2 will operate with voltages up to 15 > volts. For linearity and best transmit IMD, the higher the voltage, the > better. > > 73, > Don W3FPR > > On 4/24/2016 4:07 PM, Ioannis Kassotakis wrote: > >> Thanks Don, >> I understand that the PS current reading is only for the Base K2. >> I will rely on the bench PS display to read the 13.8 DC current. >> I have already set the CAL CUR to 3.8 Amps so that I do not get HI CUR >> alert at 10 Watts. >> >> 73, >> Ioannis PA1EQP >> >> >> On Sunday, 24 April 2016, Don Wilhelm <[email protected] <mailto: >> [email protected]>> wrote: >> >> The current display on the K2 is only for the current used by the >> base K2. I use it when testing the K2 for 'good health' and >> normal RF Gain, but during operating I see no need to monitor it >> on a regular basis. >> The Base K2 will indicate Hi Cur if the current draw goes above >> the value set by the CAL CUR parameter, and will reduce power if >> that occurs. Should you continue to get Hi Cur messages, that is >> an indication of something that should be investigated. >> >> 73, >> Don W3FPR >> >> On 4/24/2016 3:14 PM, Ioannis Kassotakis wrote: >> >> Thanks Don, >> That means that at HI PWR (>11 Watts) should disregard the >> displayed PS current figures. >> I thought that KPA100 processor would communicate the I Sense >> back to the MCU and display the correct current figure after >> rescaling. I understand that is not the case. >> >> 73, >> >> Ioannis PA1EQP >> >> On Sunday, 24 April 2016, Don Wilhelm <[email protected] >> <mailto:[email protected]>> wrote: >> >> Ioannis, >> >> The current display on the K2 indicates only the current >> for the >> base K2, not for the K2 and KPA100 combination. >> That is why you set the CAL CUR to 3.50 amps even though the >> KPA100 will draw much more current. >> >> Yes, the KPA100 does have a scaling on the amount of RF >> voltage >> that is being detected. That is used for power control >> and has >> nothing to do with the current displayed. The result of that >> voltage is sent to the VRFDET signal in the K2 (Voltage of >> the RF >> Detected). >> >> 73, >> Don W3FPR >> >> >> >> >> -- >> Ioannis Kassotakis >> > > -- Ioannis Kassotakis ______________________________________________________________ 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]
