Hi Don Thank you for your note. You answered a question that was on my mind and in fact I did use the slavaged RFC10 in my own modification. I put it across J4 the RF IN jack of the KAT100. It seems to work fine and I plan to keep it that way. The only reason I did not put it in my note was that I was not sure why it was removed from the KPA100 in the first place. Now that I know I recommend either putting the RFC10 accross J4 of the KAT100 like I did or putting RFC10 from the center pin to ground of the PL-259 and T adaptor.
Thanks for the info Don and I hope between our two notes we can save many KPA100s from snow static this winter. 73 Ken W0CZ +++++++++++++++++++++++++++++++++++++++++++++++ On 10/23/2010 7:25 PM, Don Wilhelm wrote: > Ken, > > If you salvaged RFC10 from the KPA100 upgrade, I suggest you use it. > The only problem is that it cannot live inside the KPA100 because it > couples into the base K2 circuits causing spurious responses and all > kinds of "strange happenings". > > You mentioned using a T connector - certainly, just mount the 100 uHy > choke in a PL-259 - one lead to the center conductor and the other to > the shell. Place that PL-259 on one side of the T adapter, and > connect the antenna to the other. > > A resistor will do OK, but the choke provides a better low DC > resistance path than a resistor. > > 73, > Don W3FPR > > On 10/23/2010 5:07 PM, Kenneth A. Christiansen wrote: >> 40 years ago we had a windy dust storm in Bismarck ND and I lost the RF >> amplifier in my new solid state Heathkit receiver three times that day >> before I realized the dirt and high winds were putting a static charge >> on my antenna. I found there was a capacitor between the antenna and the >> RF amp and the static would arc across the capacitor and burn out the >> RF amp. Of course tube type receivers did not have this problem. I found >> out a 100K resistor from the antenna to ground would prevent this and >> not load down the antenna. >> >> Several years ago my friend I each bought a new IC-746PRO. The first >> time we had a blizzard with 50 MPH winds and snow my friend and I both >> burned out our new rigs with snow static trying to check into the ND >> Weather Net. The K2 survived just fine. The IC-746PROs were both fixed >> under warranty but it still cost both of us shipping. I found out the >> IC-746PROs did not have any path to discharge the antenna charge from >> the snow static. >> >> I recently installed the KPA100 Upgrade and one of the steps was to >> remove R10 the 100uh choke between the antenna jack and ground. There is >> no other path to ground and I have read on the reflector about people >> having their SWR and Power measuring diodes go bad and it was easy to >> see why. I plan to use this rig to check into the ND Weather net this >> winter so knew I needed to fix the problem. >> >> > ______________________________________________________________ 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
