A dual band radio is constructed using a primary and secondary
transceiver. The primary transceiver is a complete radio that is
operational in a stand alone configuration. The secondary transceiver is
a not a complete radio and is configured to re-use components such as
fine gain control and fine frequency stepping of the primary transceiver
to produce operational frequencies of the secondary transceiver. The
primary transceiver acts like an intermediate frequency device for the
secondary transceiver. Switches are utilized to divert signals to/from
the primary transceiver from/to the secondary transceiver. The switches
are also configured to act as gain control devices. Antennas are selected
using either wideband or narrowband antenna switches that are configured
as a diode bridge having high impedance at operational frequencies on
control lines that bias the diodes.