Hi Steve,
As of today, we have released a new version of Spike which will allow you to adjust the reference oscillator in your SA44, unfortunately it will not work with your TG.
Grab the new version of Spike at http://www.signalhound.com/Spike and check out the “Timebase Adjustment” under the utilities menu. You will input a CW into the RF input of the SA44, specify its power level and frequency and you can make one click adjustments. This should get your SA calibrated. It is a software calibration and can be reversed anytime by clearing it through the same utility.
Hope this helps, let me know if you have further questions.
Regards,
A.J.