The Glonass channel IF frequency would be 1.1595MHz (for k = -7) and 8.472MHz (for k = +6);
A choice of 1596.903 MHz LO frequency to start with will be appropriate. The IF frequency of the k = -7 carrier will be 1.1595 MHz and for the k = 6 carrier it will be 8.472 MHz. With a low-IF configuration, it is necessary to center the 9.66 MHz frequency response by programming the FCEN bits appropriately. The center of the GLONASS G1 signal will be at 1601.72 MHz calculated from 1602 - 0.5625/2. The IF of this center frequency will be 4.81575 MHz given the chosen LO frequency. Then program the FCEN bits to be such that FCEN_flipped = 113 (decimal).
Refer to IF Filter Center Frequency Configuration in the Applications Information section of the MAX2769C datasheet on page 26 for more information on setting the IF filter center frequency. Note: Observe the filter response on a spectrum analyzer and experiment with values around 113 to find the setting that best centers the response around 4.8 MHz. The best value may end up being slightly different. The equations in the datasheet provide a good starting value, but the best value has to be determined empirically. Likewise, be sure to configure the IF filter as polyphase (FCENX = 1). It is not configured as a low-pass filter.
One other option is to receive only one satellite signal at a time, rather than the signals from all 14 satellites simultaneously. In this case, one can use the default settings of the 2.5 MHz wide IF filter centered around 4 MHz IF. Just change the PLL divider settings depending on which channel you wish to receive.