R 390a repair. The manual covers all aspects of the R-390A Collins radio, including its design, installation, operation, and maintenance. Time Owned: more than 12 months. The major performance change involved the installation of four mechanical filters in the IF section of the receiver. With decades of experience repairing and restoring this popular military receiver, Chuck Rippel is a master-craftsman, among the very few capable of restoring the R-390A to better than new. net. It provides detailed schematics, wiring diagrams, and troubleshooting guides to help users diagnose and fix any issues they may encounter. Contact: chuck. . Turbo Ranger Text File SX-28A IF Alignment Procedure, Rev. All of the maintenance "quirks" of the R-390 were corrected in the R-390A which made the receiver easy for the military to maintain. Oct 8, 2019 ยท These files were sent years ago to Electric Radio but were too large for publication in our magazine. Put the R-390A back on the bench, screwed the IF deck back in, reconnected all the connectors, and tightened the knob clamps back onto the shafts coming from the IF deck. Unsoldered C-549 from its turret block, cut the leads of the replacement Orange Drop capacitor to fit, then soldered it in place. I had seized an opportunity to check over my wonderful Collins R390A military communications receiver (and spy radio) and, prior to this video, I had removed the IF sub-assembly to check that the Graham Baxter's R-390A Mechanical Filter Repair Tutorial - An outstanding pictorial journey through the repair of R-390A mechanical filters. Graham Baxter's R-390A Audio Transformer Repair Tutorial - An enlightening pictorial treatise on the repair of R-390A audio transformer. rippel@cox. bewx fvtjuo qiwe fpa hihirgu zeixhij bzqswwo nxtrka tooys ppdzx