Thanks Don. That was what was in the back of my mind but wasn't sure if it was a reasonable conclusion to draw. I gather that no more than that amount of isolation is normal. So if a person were concerned about having more isolation or some reason they would need to use an external switch with greater isolation and not use the KAT500's antenna switching ability I gather.
I can sleep assured the KAT500 is working properly. David K0LUM On Nov 2, 2013, at 11:29 PM, Don Wilhelm wrote: > David, > > Your observation says that there is between 20 and 40 dB of isolation between > ANT3 and the other two KAT500 ANT jacks. That does not surprise me at all, > even though 20 dB may be on the low side. > > 73, > Don W3FPR > > On 11/2/2013 11:17 PM, David Christ wrote: >> I recently added a KAT500 to my K3, P3, and KPA500. I need some help >> understanding what I am hearing. The KAT500 was installed as recommended by >> Elecraft. The KPA500 is connected to the input, my hexagonal beam to >> antenna 1, my 40 meter dipole to antenna2, and nothing to antenna 3. >> >> With the K3 tuned to about 7.075 MHz I observe the following: >> >> If I disconnect my K3 from the KPA500 and either leave it unconnected or >> connect it to my dummy load the noise level shown on the P3 is about -140 db >> and no signals are seen or heard. >> >> With the K3 connected to the KPA500 as normal connecting to antenna 2 (40 m >> dipole) the noise level is -110 db and signals are peaking at about -60. >> >> Connected to antenna 1 (hexagonal beam) the noise level is -120 and signals >> are peaking at -80. >> >> When I switch to antenna 3 (no connection) noise is -140 db and signals are >> peaking at -100. This is the surprise. I did not expect to see such strong >> signals coming through with no antenna connected. This is also true when >> the dummy antenna is connected to antenna 3. What am I hearing here? >> should I be hearing this? I have some guesses but don't want to state them >> here yet in order to not bias people's minds. >> >> > ______________________________________________________________ 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
