I have seen 75 ohm cable work well with 50 ohm systems. The slight loss due to VSWR is offset by less loss in 75 ohm over 50 ohm for the same size cable. If one wants to trim the cable to provide a perfect match I would suggest this method. Measure the power at the output of the transmitter into a 50 ohm load. Connect the 75 ohm coax and move the wattmeter and load to the distant end of the cable. If the power measured here differs much from the first measurement less the speced loss of the cable then trim the cable length to optimize the power. I think that trimming the cable for best VSWR at the transmitter end but external to the transmitter may not give a true indication of what the transmitter is loading into.
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