{Collins} Collins 709E-1 Frequency Shift Oscillator

I am looking for any information concerning the Collins 709E-1, frequency  
shift oscillator, an accessory for the Collins 432D-2 Autotune  transmitter.  I 
have a complete AN/FRT-24 (military equivalent of the  432D-2) where FSK is 
currently disabled and I'd like to get back on RTTY.
Thanks in advance,

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