Randy,
Is the main RX dead all the time (when using only Main RX - Sub RX off)? Two quick things to check ... 1) if the Main RX is dead all the time and you have KXV3/A/B boards in each rig, swap them. If the problem moves with the KXV3, the problem is most likely D5. 2) If the Main RX works if the Sub RX is off and you have KRX3 in in each rig, swap the SUB IN boards. This eliminates an issue with T1 (the splitter) and D1/D2 T/R switch PIN Diodes. The first thing to check is the KXV3 ... If you don't have a second KXV3, check the schematics for bypassing the potentially defective one (J66, pins 13 & 15 and pins 8 & 10). 73, ... Joe, W4TV On 3/12/2016 10:36 AM, Randy Farmer wrote:
Due to an unlucky combination of station configuration and a bad TX gain calibration in my K3s (since corrected) I've managed to burn out something in the front end chain in my second station K3. I've verified the problem is in the signal path between the ATU inputs and the input to the main receiver. The Sub receiver is working correctly when connected via the AUX RF input connector, but dead in normal split mode. I've had a look at the schematic and can see a couple of probable points of failure. But... I wonder if anyone else has encountered the problem and done a successful field repair. I'd have no particular trouble replacing one or two parts on the main board, but without a board layout it would take a fair amount of effort to find the suspect parts. I'm also not interested in completely dismantling the radio if that's what it would take to effect the repair. Has anyone else found and fixed such a problem? I'd be very interested in hearing your experience. 73... Randy, W8FN ______________________________________________________________ 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]
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