Fixed: my Exact Model 127 Sweep generator.
Really neat thing to have. Where before I used two function generators cobbled together to sweep the IFs of the little Radiola radio, this does everything in one unit, as it provides the ramp of the sweep at an output. You can also precisely dial in the start or stop frequency, and it can do bursts and pulses.
So why didn't I use it? Because it was broken
Really neat thing to have. Where before I used two function generators cobbled together to sweep the IFs of the little Radiola radio, this does everything in one unit, as it provides the ramp of the sweep at an output. You can also precisely dial in the start or stop frequency, and it can do bursts and pulses.
So why didn't I use it? Because it was broken
Bun's Lab
Photo
A lil' update on this thing: I've attempted an alignment. However, it needs help. The oscillation is generated using an RC timing circuit. The R values are selected with the digit dial at the front, the C using the frequency ranges.
The resistors there are within spec for what their respective bands call for, but the service manual says they are handpicked. And handpicked they have to be for this to be somewhat accurate. And they drifted enough for it to be woefully off. I can get at best 2 digits accuracy when it should give me 3.
The resistors there are within spec for what their respective bands call for, but the service manual says they are handpicked. And handpicked they have to be for this to be somewhat accurate. And they drifted enough for it to be woefully off. I can get at best 2 digits accuracy when it should give me 3.