Okay, I guess I left out some critical details from my original post. I am using a 50 ohm load that is intended to be used to convert test equipment from hi-impedence input to 50 ohms. It is labled 50 ohms and measures 50 ohms with my DMM. It should be purely resistive and I do not have any equipment to prove that it is.
The need to load it properly using the KAT2 was only because I wanted the KAT2 in-circuit for improved forward power measurement within the K2. I knew that it would need to load things to cancel itself out. Based upon what Ron, Don and Jack have said, I guess that I should remove the KAT2 and RF probe and try something similar to what I tried last time I attempted to understand how well this radio tracks against the published specifications. Would it be reasonable to just place a short piece of coax between the load and an O'Scope, measure the peak-to-peak voltage, divide by 2*SQRT(2) and go from there? Would this require knowing the coax velocity factor and dealing with prioper lengths of coax based upon wavelength (half or quarter) at the different frequencies? I ask these questions because last time I tried using my Scope to make these measurements, the measurements were obviously incorrect because they indicated that my rig was way more than 100% efficient. What I expect is that I can make apropriate measurements at 3 points on each band and see that I get no more that 10% variation across said band and from band-to-band. I expect that I have a problem on 10 Meters because I am getting a HiCur indication at 3 amps when set for 10 watts, so something needs changing there. However, until I have trustable measurements on the other bands, I expect that untangling the issues will be impossible. Help from the experts is needed on how to make such measurements without fancy RF power meters. Obviously a purely resistive 50 ohm load is the first requirement, and I believe that I have that. 73, Fran _______________________________________________ Elecraft mailing list Post to: [email protected] 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
