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SEA-235 SSB Tuner Problem
I just got down to my boat on the Rio Dulce in Guatemala and found
that my SEA-235 SSB tuner isn't tuning. The tuner should automatically tune after switching frequencies and transmitting. Also, by grounding the Demand Tune (DMD TUN) signal wire, the tuner should tune. This is accomplished by pressing the Function (FNC) key while pressing PTT. When I do so, I see the demand tune signal drop, but no tuning takes place. I either get NO TUNE displayed on the transmitter display or I get a very high SWR (7 to 8+) The tuner correctly runs through its initialization as shown by the configuration of the tuner relays after powering up. I've carefully cleaned and checked all of the connections and my ground connections are bright copper. I had this problem once before, but it mysteriously cleared up just as it appeared. On past occassions I've heard the tuner relays chattering while transmitting. This also comes and goes. I've corresponded with SEA about this and have shipped the radio back to them, but they found nothing with the radio. I can receive and transmit, and I've been told that my signal is clean, but weak as I'm at low power. I can send and receive e-mail via SailMail reasonably well (the propagation on the Rio Dulce is always a problem). What I'd like to know is what other tests can I run to diagnose the problem. Could it be the antennae? Any suggestions would be greatly appreciated. Just remember that I'm in the middle of nowhere. Thanks, Geoff |
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