Possible RF Mixing for Increasing Frequency of a Pulse Train
It will not work. You can't increase the frequency of a pulse train by mixing it with a sinusoid. This figure shows what happens. The spectrum on top is the pulse train at 270 kHz; the spectrum below is the result of multiplying it by a sinuosid of 112 kHz. The purple lines correspond to shifting the original spectrum to the left, and the orange lines are the original spectrum shifted to the right.
As you can see, the resulting spectrum is not a rectangular pulse train.

If what you need is a 382 kHz sinusoid, you will need to bandpass filter the mixed signal. The BPF will have to be pretty narrow with a short transition band.