> I have no measurable RF output on 40m or any meaningful RX on 40m. > > The RX/TX works on all other bands including 160m. > > I get the same RX/TX results from ANT1 & ANT2 and main. > > I get the same RX results on the receive ANT.
The only thing I see that is common to transmit, receive and the RX antenna and is only in circuit on 40 meters is the Band Pass Filters - particularly the toriods L1 and L2. If you had not said the RX Ant was also dead, I would suspect L25 and/or L26 in the Low Pass filter. If you have a separate antenna for 40 meters and are connecting it to the receive antenna for testing, I would also check the antenna (or tuner). > My guest had a strange look on his face and I asked what > happened. There was a spark from the outside of the antenna > connector on the back of the K2 to the center connector of the > coax. This would indicate a DC path through the secondary of the PA output transformer, (RF board), through the LPF and to the antenna connector. With +12V on the chassis (reversed power supply), I can see damage to one or both of the toroids in the LPF, damage to relay K12 or damage to the antenna system (balun?). 73, ... Joe, W4TV > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mark > Saunders, KJ7BS > Sent: Tuesday, September 23, 2008 11:51 PM > To: 'Elecraft Mail List' > Subject: [Elecraft] RE: A Bad Thing Happened To My K2 - Update 1 > > > Thanks to everyone for the suggestions. Here is some more > information resulting from your suggestions. > > I have no measurable RF output on 40m or any meaningful RX on 40m. > > The RX/TX works on all other bands including 160m. > > I get the same RX/TX results from ANT1 & ANT2 and main. > > I get the same RX results on the receive ANT. > > Mark, KJ7BS > Glendale, AZ > Editor, The SKCC Centurion > Elecraft K2 S/N 0539 > Fists # 2972 CC 1806 > SKCC # 2240 C56 T20 > MQFD # 128 > QRP-ARCI # 12647 > AZ ScQRPions > COGRC Emergency Communications > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mark > Saunders, KJ7BS > Sent: Monday, September 22, 2008 10:04 PM > To: Elecraft Mail List > Subject: [Elecraft] A Bad Thing Happened To My K2 > Importance: High > > This evening I had a guest ham in the shack who was curious > about my K2 and asked if we could hook it up. So we did. I > pointed out which 12v power strip, power cord, and antenna to > use. While I was getting the proper computer interface > cables hooded up, my guest connected the radio to the power > and switched it on. I heard a loud snap and immediately > looked in the direction of the K2 operating position. My > guest had a strange look on his face and I asked what > happened. There was a spark from the outside of the antenna > connector on the back of the K2 to the center connector of the coax. > > > > That can't happen, right? Wrong. > > > > After shutting down the power supply and inspecting things, I > discovered my guest had wired the power backwards. > Fortunately the reverse polarity circuitry protected the > radio and internal battery. The radio was operating from the > battery, that's why it came on. I still can't understand > where the spark came from. However, I now have virtually NO > receive on 40m, that's where the radio was when the spark > occurred. I have transmit and receive on all other bands and > transmit on 40m, just no receive on 40m. > > > > That spark killed something dealing with 40m receive. It is > so bad I can't even hear the local oscillator around 7000 KHz > with the pre-amp on. There is no CW or SSB receive. > > > > Mark, KJ7BS > Glendale, AZ > Editor, The SKCC Centurion > Elecraft K2 S/N 0539 > Fists # 2972 CC 1806 > SKCC # 2240 C56 T20 > > MQFD # 128 > QRP-ARCI # 12647 > AZ ScQRPions > > COGRC Emergency Communications > > > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
