How does the FireFox handle GPS hold-over mode?
Other commercially available reference-timing receivers boast of their long hold-over circuitry performance when not being able to receive any satellites. The FireFox synthesizer uses a slightly different approach. Instead of hoping for the best and designing circuitry for hold-over mode when the receiver cannot receive GPS satellites due to jamming or due to the low sensitivity of competitive receivers, the FireFox uses an optimized design and the best receiver available on the market to avoid any GPS receiver drop-outs in the first place. Once the receiver has established its position and is in position-hold mode, only one satellite needs to be seen by the receiver for the FireFox synthesizer to work properly. The sensitivity and jamming immunity of the FireFox GPS receiver is absolutely exceptional. Thus long hold-over periods will likely never occur even if the antenna is just placed in a window sill.
