Udo, I'm not one of the more knowledgeable people on the list and hopefully, somebody with better knowledge than me helps you more. But with that, this is what I would look at if it were my radio...
1. Are your crystal filters set up properly; Could they be in reverse order between slots 1-5 on the main board and sub receiver? If they are in the identical order, have you set the K3 up to know what crystals are in there and, do you have the order of the crystals correct using the K3 Utility? If you have one bank listed opposite in the filter configuration, this will not work properly. 2. When Using B set; do you have the filters set the same on both Sub & main? Do you have the antennas set properly for the main as well as sub Rx? Could your main antenna for RX be listening to the wrong antenna? It's good you have two K3's: What you might do is have both of the K3's you have, side by side and check each setting, comparing the known good one to the settings on the one you're having trouble with. 3. Have you tried your good radio in place of your K3 that has the issues? Conversely, have you tried your problem K3 in the location your good K3 is? Perhaps there is a problem with the coax or antenna connections? Hopefully you will find your answer without having to have anything repaired. 73 & Happy hunting, Gary KA1J > Gentleman, > > I'm struggling with a Main RX vs. Sub RX issue. My Main RX is rather > deaf compared to the Sub RX. I see at least 23.5dB attenuation between > Main RX and Sub RX when comparing highly stable signals from my signal > generator (HP8664A). This is only for ANT1/2 vs. AUX-IN! > Example: > -33dBm on 28.500 > into AUX-IN (SUB RX): exactly 59 +40dB > into ANT 1 (Main RX): 59 +15dB > into ANT 2 (Main RX): 59 +15dB > > I've checked all the usual suspects (pin diodes): > D1 and D5 on the KXV3A: o.k. > Each and every pin diode on the SUB IN board: o.k. > D5 on the Main RX board: o.k. > > This is a K3 #59xx with almost everything inside money can buy. > > My second K3 (serial #39xx) does not show this strange behavior. Main RX > and SUB RX show exactly the same values on ANT1/2 and AUX IN. -33dBm is > 59+40 on MAIN and SUB RX, no matter if Ant1, 2 or AUX IN. > > Any idea? I'm searching for weeks now and I'm close to give up. > > Udo, DK5YA > -- > ****************************************** > Webs by DK5YA: * > http://www.mmmonvhf.de/ [editor]* > http://www.vhfdx.de/ [owner] * > http://www.palekastro.de/ [owner] * > http://www.solweb.de/ [owner] * > http://www.spessartwetter.de/ [owner] * > ****************************************** > > ______________________________________________________________ > 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 > Message delivered to [email protected] > ______________________________________________________________ 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 Message delivered to [email protected]
