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Heathkit LMO ( SB series) Range Question
Before I tear this thing apart, I thought I'd "go to the well" to see if
anyone has had the same problem. I acquired an exceptional SB-301, but the tuning range is restricted. The LMO is supposed to tune 500 KC - from X.0 to X.5. Mine physically stops at X.055 ... in other words, the counterclockwise "end of travel thunk" comes too early, and won't let me tune the bottom 55 kc of the band. The clockwise "end of travel thunk" comes where it should. These "thunks" both sound and feel the same .... as you would expect them to: solid and defined, neither end like the feel / sound of a coil getting caught up inside a tube. The tuning is smooth and unobstructed across the full range. All told, I get around 432 kc of mechanical travel instead of 500 kc. The LMO output is supposed to be from 5.0 to 5.5 Mhz. Mine ranges from appx. 5.014 to 5.444 Mhz. The readout is correct - a signal transmitted on 7.2 Mhz. is received on 7.2 Mhz per the dial. The construction of this receiver is about the best I have ever seen on an SB-XXX kit, so I don't think it's a question of shoddy craftsmanship. Visual review of the mounting of the LMO, dial, knob, shaft, and 100KC insert into the spiral on the back of the tuning dial all seems to be perfect, with no obstructions showing anywhere. So, that's what I'm looking at ... essentially a perfect LMO, but with abbreviated end-to-end travel. My hope is that I'm just missing something stupid, and it is pointed out to me so I don't completely disassemble the unit if I don't have to. Thanks in advance for the input. 73, Jeff W8KZW |
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