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R-4C wire with no end stop

Peter Ravn All Messages By This Member #71045 On the back of the print on the MODE/FILTER switch in my R-4C there is a 3 cm wire with no end stop. It is soldered onto the shield of the coax cable, and the solder looks original. Any idea what it is supposed to do? Serial number 18xxx. Thanks. Peter OZ8CTH IMG_8437.JPG
Bob Loving All Messages By This Member #71074 Peter, here is an educated guess as I do not have an R-4C in front of me. Is the "wire" stiff and springy? If yes, it might have been used to provide a ground path for the metal part of the switch shaft. This would prevent coupling between two wafers of the switch that could lead to "filter blow-by." It is possible the "wire" was never put into the correct position during production. Maybe someone else knows the real reason for the "wire." Bob K9JU On Saturday, May 6, 2023 at 09:18:52 AM EDT, Peter Ravn via groups.io <fasan5@...> wrote: On the back of the print on the MODE/FILTER switch in my R-4C there is a 3 cm wire with no end stop. It is soldered onto the shield of the coax cable, and the solder looks original. Any idea what it is supposed to do? Serial number 18xxx. Thanks. Peter OZ8CTH IMG_8437.JPG
Mark - WB0IQK All Messages By This Member #71102 Bob's correct. It's supposed to be laying against that metal coupling on the shaft. Probably has lost its spring over time.? Mark, WB0IQK
Peter Ravn All Messages By This Member #71500 What's the idea of the metal cover on top of the filter switch? The cover is not seen in all R4C's. Thanks. Peter OZ8CTH
Steve Wedge, W1ES/4 All Messages By This Member #71503 Primarily shielding for the troublesome 6EJ7 third mixer.? Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent from Proton Mail for iOS toggle quoted message Show quoted text On Thu, May 25, 2023 at 09:26, Peter Ravn via groups.io <fasan5@...> wrote: What's the idea of the metal cover on top of the filter switch? The cover is not seen in all R4C's. Thanks. Peter OZ8CTH

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