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1949 Motorola 5A9M
#5

Thank for that info Arran! Very interesting. Phillips and Motorola must have made some type of marketing deal back then. I like that schematic as well. Yes the loop antenna is connected to the hinges. That was one of the first things I checked after disconnecting the front antenna panel from the chassis. Using the hinges as the contact points, there was about 3.5 ohms across the loop.

I've been scratching my head about how to fabricate the crumbled and missing red plastic mounts for the hinges on the chassis side of the front dial panel. Fortunately the riveted hinges on the antenna loop panel side are still solid. Because of the way the mounts were not only riveted to the front dial panel, they were also separately riveted to the hinges and the hinges need to be electrically isolated from the front panel metal. I tried to reuse the existing rivits without removing them by creating a small block of wood with slots that would slide into the rivit but I just could not make that work. I've now gone to a small block of hardwood that uses M2 machine screws with nuts to hold the mount in place. In the picture below I have used some electrical tape to isolate one of the hinges from the metal frame and it seems to be a viable solution. The other hinge looks similar. The prong that is sticking up is the fitting for the connector between the radio chassis and the antenna. I may redo the set up to make it neater and paint the wood to be a maroon color like everything else but at least the concept of the repair will work. I will note that its not easy to get those screws in and tightened down while trying to hold everything in place but it can be done. For those of you who watch the British TV show "The Repair Shop", I can say "Its very fiddly!"

[Image: https://www.dropbox.com/scl/fi/vwsanaych...uwsz&raw=1]


Messages In This Thread
1949 Motorola 5A9M - by klondike98 - 05-10-2025, 01:36 AM
RE: 1949 Motorola 5A9M - by Joe Rossi - 05-16-2025, 07:56 PM
RE: 1949 Motorola 5A9M - by Arran - 05-19-2025, 12:41 AM
RE: 1949 Motorola 5A9M - by Arran - 05-20-2025, 07:48 PM
RE: 1949 Motorola 5A9M - by klondike98 - 8 hours ago
RE: 1949 Motorola 5A9M - by Arran - 5 hours ago
RE: 1949 Motorola 5A9M - by GarySP - 2 hours ago
RE: 1949 Motorola 5A9M - by klondike98 - 31 minutes ago



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