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Hi John,

This matter has already been discussed by those skilled in the art of calibration.
What's important is that you can use it in short waves, but you said both 2M and 70cm.
Therefore, I would recommend that you purchase a N dad calibration kit.
I bought it on aliexpress for 18 usd at a reasonable price here:

It's cheaper now :D

I hope I could help.
73, Gyula HA3HZ