The KL 503 is a 12V linear amplifier, designed for use in the 25 – 30 MHz frequency range, with a driving power of 1 to 6W in all modes. The KL 503 features a six-position power selector via a front panel control, as well as an electronically switched receive preamplifier, which can be activated via a front panel switch.
| Frequency: | 25–30 MHz |
| Input Power: | 1W–6W |
| Transmitting power: | 300W |
| Operating voltage: | 13.8V DC ± 1V |
| Input current: | 30A |
| Fuse: | 3x 10A |
| Input VSWR: | 1.1-1.5:1 |
| Dimensions: | L 300 W 190 H 67 mm |
| Weight: | 2.050 gr |
