Thanks to both of you for the sugestions. I actually got this to work, and I am not sure if it originally worked, or if my resoldering fixed a problem. I was able to obtain a voltage reading but only over about 20 degrees of the rotation of C55. I had no idea it would be this touchy. Also, the lowest I can get is about 009-011 on the reading. If this sounds normal, I may be OK. If not, I may still want to do some more checking/debugging. The ATU does now appear to be working.
In general, I found the KAT2 instructions were not quite up to th elevel of excellance of the other K2 components I have assembled. A couple small things like telling you that R6 was nt yet installed at the end of board assembly would have helped. Also, I was told to remove some stuff that was not there, and told to add some stuff that was already there (of course the later made me happy). As always, thanks for the help. Tom, KG3V On Sep 10, 2009 8:19pm, Don Wilhelm <w3...@embarqmail.com> wrote: > Tom, > You must obtain a low balance reading before you can do any *valid* power > or SWR calibration. > If you cannot null with the capacitor, there is something wrong - > normally that something is associated with T1 and the other wattmeter > components, but you say you have checked those. > OK, the next logical step is to find out for certain whether you have a > problem with the wattmeter or the LC board. Separate the Control board > from the LC board and place a jumper from J4 pin 2 to J5 pin 15 (yes, it > is a long jumper - the second pin in from the far ends). Now, with only > the Control Board (you must use the ANT1 connector) - connect a dummy > load and again try to balance the wattmeter - if you find that the > capacitor now achieves a null, look for the problem (likely a relay) on > the LC Board -but if you still cannot null the wattmeter, take another > look at T1 and its associated components. > 73, > Don W3FPR > kg3vt...@gmail.com wrote: > Just finished assembling a KAT2 for my K2. When I started testing I found > a problem. I only get "HI" on the display in the CALn step, where you are > supposed to adjust for a reading of 000. Reducing power as low as I can > go, I can get a "000" display, but as soon as I increase the power, I > get "HI". I tried CALP and I did get readings that made some sense (a > high value for FWD and low value for REF power) but the FWD was something > like 22 watts, which seems too high. > I disassembled and reveiwed the SWR bridge section, counted turns on T1, > removed the link on T1 and pulled up T1 to inspect the leads and > soldering. Also verified all the component values and soldering in that > area. > So my streak is over. Thought you just finished assembl, turned on power, > and all this Elecraft stuff just worked! Guess it had to happen. > Any ideas/ > Thanks/73, > Tom, KG3V ______________________________________________________________ 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
