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An increasing number of small ventures are launching missions to space withsmall volume satellite platforms. These small spacecraft are now beingseriously considered for deep-space missions, creating a need for groundstations capable of detecting the faint signals they will transmit to Earth.Here, recent developments in room-temperature solid-state masers are reviewedto determine their readiness for use as a cheap low-noise amplifier fordeep-space communications. Masers based on Pentacene-doped Para-terphenyl(Pc:PTP), Pentacene-doped Picene, Diazapentacene-doped Para-Terphenyl(DAP:PTP), Phenazine/1,2,4,5-Tetracyanobenzene (PNZ/TCNB) co-crystal, NVDiamond, Cuprous Oxide, and Silicon Carbide are considered for comparison.Pc:PTP offers good spin polarisation density and output power but suffers fromthermal dissipation problems, DAP:PTP may help to obtain a lower thresholdpower than that achieved with Pentacene, PNZ/TCNB stands out in spinpolarization density but has not achieved room-temperature masing, and NVDiamond is the only medium to have sustained continuous operation but has verylimited power output. The other gain media proposed offer theoreticaladvantages but have not been tested in a working maser device.

Room-temperature solid-state masers as low-noise amplifiers to facilitate deep-space missions using small spacecraft