Phelpsvigier Posted December 13, 2014 Share Posted December 13, 2014 On the AC-130U, HF 2 has had this open job for 6+ months now.. No TX, RX ok, coupler faults and no side tone. After 4 straight days of troubleshooting my mind is burnt. Tried swapping rt's, r2 couplers, select scan, shot wires, rf line.. Any help? Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted December 14, 2014 Share Posted December 14, 2014 Try it from all ICS stations. Quote Link to comment Share on other sites More sharing options...
Phelpsvigier Posted December 14, 2014 Author Share Posted December 14, 2014 We have.. No go Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted December 14, 2014 Share Posted December 14, 2014 Long wire or flush ant? I'm thinking Long wire... Quote Link to comment Share on other sites More sharing options...
tinyclark Posted December 16, 2014 Share Posted December 16, 2014 I've got the wiring diagram setup for the XMIT section of HF1 & HF2. I've also got 3 slides I made that explain the whole eff'd up scenario that the engineers came up with. I will load them up. If you can't click on and save them, I can e-mail them to you. This is for the longwire antennas. The slides are for #1, but the #2 system works the same way. Puzzles me with a coupler fault though.#1 HF interlock.pdf#2 HF interlock.pdf Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted December 16, 2014 Share Posted December 16, 2014 Get a TDR and adapters and "look" at your Tx coax lines. Also the coupler to the HF Mast, Mast itself or the internals may be the problem as the coupler cannot "match" the ant for the freq you have selected. Quote Link to comment Share on other sites More sharing options...
KF4DVG Posted December 17, 2014 Share Posted December 17, 2014 1. Has the connection on the back of the coupler mount been checked for the #2 side? This is common between #1 AND #2 going to the antenna with the exception of the coupler mating point on the rear of the dual mount. 2. Has a new #1 coupler been installed? Wondering since (ref Fig 4-13 and Fig 4-25 in the -2-13) the ON/OFF (pin J), ANT AVAILABLE and ANT REQUIRED signals come from the #1 coupler and go to the #2 coupler. Just a wild hair, but if the #1 was jacked up and wouldn't supply the proper signal to the #2, then maybe?????? Good luck Bob Quote Link to comment Share on other sites More sharing options...
Jean Posted January 9, 2015 Share Posted January 9, 2015 We had a similar problem found on the T/R connector 1 single string of shielding hitting the inner conductor. Now if we start changing parts in HF system we do resistance test on all wiring ( Better be safe then sorry). I hope it helps you. Quote Link to comment Share on other sites More sharing options...
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