Building trust every day  Rockwell Collins Museum

Jul-25 ···
233D Transmitter Restoration Project

Dale, wa9ena, brought in a nice power resistor network that should work well as the bleeder in the audio power supply. Thanks Dale!

Jim Nicoll, a former RC international marketing guy, stopped to visit the museum and the transmitter project. Jim’s office was just down the hall in 120 and made it a point to show the museum to customers. He was very impressed with the museum and the old transmitter and will help however he can from his Springfield, Mo home.

Mike Hynek is taking on the power contactor and power control system to resolve the as built vs. documentation questions. In an hour or so, he pointed out several things that I had missed, so I expect we will be able to apply power soon.

I can get back to putting the high voltage rectifier and bias supply chassis back together, so we may be ready for some tests in the next couple of weeks.

Rod took a panel with the interior/chassis gray to attempt to get a paint match from Klinger or another paint supplier. I expect when he completes the exciter work, it will look as great as the output network. I don’t expect to reach that level of restoration on the remaining gray painted chassis until after we attempt some functional tests, but his standards will set the goal for the “next phase”. Same can be said about the remaining chrome chassis.

I’m continuing work on a “punch” list of remaining items that need attention. I’ll start attaching it to my blog next week.

Power resistors for the HV bleeder and voltmeter multiplier are still needed; I found a 200 watt 100K wirewound but it appears to be open. If nothing is available by the time we are ready to test HV, I’ll fab a new board to use series/parallel combinations of available parts to get the proper values. My goal will be to select resistors to match the original bleeder value but double the power capability.