Note
The Palomar P-405 (DC powreed) and P-408 (AC powered) receiver preamplifiers improves weak signal reception for the shortwave listener. Frequency coverage is 1.8 to 54 MHz in four ranges: 1.8-4, 4-10, 10- 21 and 21-54 MHz. They provides up to 20 dB of gain and reduces image and spurious response. These preamps also features a two position antenna switch and -20 dB attenuator.
The preamplifier uses a tuned RF amplifier covering all the amateur bands from 160 through 6 meters and all foreign broadcasts as well as other services in this frequency range. It employs a low noise dual gate FET transistor providing a noise figure of 1.5 to 3.5 db over the entire range.
