The BK Precision 1201SR TV Modulator/Converter provides a low‑cost way to generate modulated carrier frequencies for U.S. VHF broadcast and CATV channels. It can function as a modulator, using a composite video source, or as a converter, shifting an already‑modulated channel‑3 RF carrier to a different frequency.
The manual includes safety information, detailed specifications, control descriptions, operating instructions, maintenance procedures such as fuse replacement and line‑voltage modification, and a list of supplied and optional accessories.
| Frequency Coverage (STD TV VHF) | Ch 2 thru Ch 13 (55.25 to 211.25 MHz) |
|---|---|
| Operating Temperature | 0 °C to +45 °C |
| Dimensions (HxWxD) | 3.5 × 9 × 10.5 in (89 × 230 × 270 mm) |
| Weight | 3.5 lb (1.59 kg) |
| Video Input Impedance | 75 Ω |
| Channel‑3 Input Level | 60 mV p‑p maximum |
| Frequency Accuracy | +50 ppm |
Turn the unit over, remove the four bottom screws, remove the top cover, locate the fuse at the left rear of the PCB and replace it with the proper type and value.
Remove the unit’s cover, then change the PC‑board jumpers (JU1‑JU4) according to the desired voltage configuration as described in the manual.
It is rated for ambient temperatures from 0 °C up to +45 °C.