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| By experimentation, the “Q in” and “Q out” switch is simply a squelch type circuit with a slotted pot on top of the chassis for sensitivity adjustment. It sets the signal strength threshold that allows the audio to pass through and be audible in the speaker. It can be set for complete audio cutoff with no antenna connected and full audio with the antenna connected. The “Q” likely means “Quieting. |
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| The interconnection panel is at the back of the receiver. |
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| The internal nameplate says "Canadian Marconi Co", Vibrator Unit Assy Rating -6V Type 54780 S/N 159 Spec. 56049 |
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| Note the circular crystal on the phenolic board just to the right of centre. The three round cans at the right screw off the base, exposing the coils, which look like they’re for the low HF range. |
| LFR-2SB
S/N 329 photos courtesy E-bay. Here is the topside nameplate data:
CANADIAN MARCONI
COMPANY
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