Now there is an alternative to the unstable crystal oscillator chain that drifts constantly.
The Model 902 allows precise receiver/transmitter frequency control using a stable external 10
MHz reference oscillator like a TCXO, Oven Controlled Oscillator or a Rubidium Oscillator.
The Model 902 outputs one of 8 selectable frequencies listed in Table 1 to provide Local Oscillator
frequencies for the follow IF frequency ranges - 144MHz, 50MHz, 28MHz and 14MHz.