About the 432 MHz Band ….
Although maybe not as popular as 144 MHz, the 70cms band has in similar ways undergone the same technology revolution as its lower band neighbor. The introduction of solid state low noise receiver frontends, LDMOS power amplifiers and computer generated digital modulation, DSP techniques and optimized Yagi designs have all evolved at 70cms too.
The band is very similar in nature to the 144 MHz, offering a broad array of modes such as FM, via simplex, repeaters,
IRLP/Echolink nodes etc. SSB and CW are very popular, as well as newly introduced modes such as JT65.
Although similar in characteristics to 2M its worthy of note that this band is above the cut off frequency for Sporadic E. Mainstay modes such as Tropospheric Ducting, Meteor Scatter and Aurora are all present on this band and in fact some modes such as Tropospheric Ducting are more prevalent due to the smaller wavelengths.
All of the main manufacturers offer transceivers in the same guise as their 144 MHz options either as single, dual or multiband options. Again transverting remains popular for high performance stations, with a number of suppliers offering kit or ready built equipment.
Readers should also refer to the 144 MHz band description for supplemental information.