Re: TR-3 Band Switch Wiring
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It serves as the antenna for the calibrator signal. ?Not sure why Drake did it that way. It¡¯s confused many in the past including myself. Good luck with the TR-3. I have two of them. My favorite radio is my TR-3 with TR-4 sideband filters in it. ?You may find that audio is not ideal on one or both sidebands. The TR-3 filters are its greatest weakness. You can find more details here with some simple searches.
On Tuesday, April 1, 2025 at 10:39:51 PM CDT, Joe W7BWA via groups.io <w7bwa@...> wrote:
WARNING:? I am a hobbyist and I am learning vintage radios. I can usually find my way around schematics to some degree, but not well. I do better with service manuals and I've not found any for Drakes. I may also use wrong terminology for the parts I describe, so I have included photos. Please be patient with me and don't roll your eyes if my question is dumb.
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I'm refurbishing and recapping a TR-3. I have a mystery that I'm hoping the Drake brain trust can help me with...
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While cleaning up the very dirty band switch of this radio, I came across a white/brown wire that appears to go to nowhere.
I know I did not knock it off and without my flashlight, I would have never seen the unconnected end under the band switch. The wire begins on the top of the chassis on a lug attached to a little vertical circuit board adjacent to V11 I believe (see photo). This white/brown wire goes from this little board, through a rubber grommet, through a hole on the top end of a wafer board. Then it was bent downward next to the band switch wafer and not connected to anything.
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The other part of the mystery is oddly this end of the wire does not appear to have been ever connected. The strands of wire are far inside the insulation (see photo). There are no strands coming out of this wire, nor the bottom of the switch wafer.
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Many thanks. 73. Joe
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Joe - W7BWA
Custer, WA
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