Good news! I swapped out the 1ft jumper for a 20ft jumper and moved the balun.... problem solved! Thanks all for you help!
On Mon, Mar 12, 2018 at 7:19 AM, Alan Lambert <a...@thelamberts.com> wrote: > I recently acquired a KP500/KAT500 for use with my Kx3/KXPa100. I know > the person I bought it from well and I am 99.9999% sure it is not an > issue with the amp or tuner. > > I was making some notes (a chart) for input to output power levels, > mostly just to ‘get to know’ the amp a little better. At the time of > these issues, I was on 80m SSB and the Kat500 was showing 1:1 / 1.2:1. > > The output watts I have listed below are not ‘actuals’ I’m just > recalling them from memory so may be off a few watts. > > I set the Kx3 to 8w and called “test test test 1 2 3 kn4bbc” I showed > ~80w out with a 1:1 to 1.2:1 SWR.. GREAT! > > Moved up to 9w and got 100w out… same SWR – more Great! > > 10w I got 175w same SWR – sill looking good! > > 11w I got 250w same SWR – Awesome! > > Now this is where the problem comes in. > > I set to 12w… As I starting calling my “test test test 1 2 3…” At > first things looked great..I was getting 300w same SWR but then > suddenly I get high SWR followed by “High Refl” on the KPA5, fault > light comes on and I get warning tones. > > So I tuned the KAT500 again and tried the whole thing again with the > same results. > > Gear wise: > > KX3/Kxpa100 with ATU disabled > KPA500/KAT500. > > Ant1 on Kat500 > 1ft LMR400 jumper > 1:1 ATU Current Balun > 225 > feet of 450 ladder line > a ½ wave 80m center fed, inverted V dipole. > Center point is ~90 feet off ground. > > The Balun is a Balun Designs Model 1161 > > The shack is on 2nd floor in middle of the house and has no exterior walls. > > The ladder line starts in the shack, there is about 2 feet of in the > shack then enters my attic space thru and opening in a sheetrock wall. > Inside the attic space there is a long slow, wide loop about 50 feet > long. I was careful to keep it away from metals and it does not cross > itself however some of it is lying on top of plywood. From there its > exits the house in the ridge cap at the tip top of the roof at about > (40 feet off ground) The ladder line then hangs from a rope that runs > from the eve to the tree line about 175 feet away which is where the > center point of the dipole is. In short 175 feet outside 50 feet > inside. > > > Ideas of what my problem might be? > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
