RE: [Elecraft] Odd power problem?
Web, Are you referring to the KPA100 internal wattmeter readings or some external wattmeter? If it is an external wattmeter, do you know its accuracy? Have you calibrated it? Several possibilities occur to me - 1) You are driving an antenna with high SWR and the KPA100 is reducing power because of the SWR; - 2) The internal wattmeter in the KPA100 is not properly calibrated and is detecting that the KPA100 output is at your requested poswer setting when the actual power is considerably less; - 3) The internal wattmeter pot in the KPA100 is not set correctly and is incorrectly reporting a high SWR condition. I suggest calibrating both your external wattmeter and the KPA100 internal wattmeter with a known good 50 ohm non-reactive dummy load (check it with an antenna analyzer) and an RF Probe measuring the RF Voltage across the dummy load. Use the 40 or 80 meter band so the added capacitance of the RF Probe does not have a significant effect and calculate the actual power output as V*V/R where R is the resistance of the dummy load. Note that your dummy load MUST be resistive only - no inductive or capacitive component if good accuracy is to be achieved. A power level somewhere between 20 and 50 watts can be used for the calibration. 73, Don W3FPR > -Original Message- > > Just finished the conversion of my K2 to a K2/100. On SSB, power > seems quite robust, with my wattmeter showing 70~80 watts on voice > peaks (I would have expected about 40~50). On CW, I'm only getting > about 40~50 watts dead key (I would have expected 100). It seems > like this is backwards from every radio I've ever owned, and I can most > certainly live with this. I got every upgrade available (resistors, > caps, etc.) > before starting the build so all parts/firmware are current as of July > 2005. > I really don't want to go back inside since everything else is performing > quite flawlessly. But in the event I ever have to go back inside in the > future for another reason, what should I look at as the culprit? > > Thanks, -KR4WM > > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.10.8/71 - Release Date: 8/12/2005 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Odd power problem?
My first suspicion would be the test setup. How are you measuring power? What supply voltage? What's it drop to on Key down or Voice Peaks? What's the current Tx? What's the load? Dan / WG4S / K2 #2456 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Web Williams Sent: Sunday, August 14, 2005 9:19 AM To: Elecraft List Subject: [Elecraft] Odd power problem? Just finished the conversion of my K2 to a K2/100. On SSB, power seems quite robust, with my wattmeter showing 70~80 watts on voice peaks (I would have expected about 40~50). On CW, I'm only getting about 40~50 watts dead key (I would have expected 100). It seems like this is backwards from every radio I've ever owned, and I can most certainly live with this. I got every upgrade available (resistors, caps, etc.) before starting the build so all parts/firmware are current as of July 2005. I really don't want to go back inside since everything else is performing quite flawlessly. But in the event I ever have to go back inside in the future for another reason, what should I look at as the culprit? Thanks, -KR4WM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Odd power problem?
Just finished the conversion of my K2 to a K2/100. On SSB, power seems quite robust, with my wattmeter showing 70~80 watts on voice peaks (I would have expected about 40~50). On CW, I'm only getting about 40~50 watts dead key (I would have expected 100). It seems like this is backwards from every radio I've ever owned, and I can most certainly live with this. I got every upgrade available (resistors, caps, etc.) before starting the build so all parts/firmware are current as of July 2005. I really don't want to go back inside since everything else is performing quite flawlessly. But in the event I ever have to go back inside in the future for another reason, what should I look at as the culprit? Thanks, -KR4WM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
