Soldier any connection you desire, DO NOT MIX UP THE PARITY (which end was ground), ensure any feedline remains same resistance (this then gets into cables and antenna systems not intended by the manufacturer - and not disclosed to us). Be advised, there's information necessary you haven't disclosed...so these are not instructions.
Lastly, due to the wavelength of UHF and SHF waves, cables longer than manufacturer's will likely have issues. You also have to make sure you don't make your cable a resonant part of the antenna system - THIS IS HARD ON UHF; AND ESPECIALLY SHF where you only have millimeters to work with!
So obviously, the manufacturer made these totals and calibrations before mass producing that radio design...SO I ADVISE NOT TRYING TO CHANGE IT. After changing it, you may run into other rule problems about the device or its modified state, so I will not proceed further.
(the above information should not be solely used by anyone abroad to modify a radio - it is pseudo-jargon)
If you have any questions about the above, don't proceed!
I think you should study it, if you have to ask.
When I was a n00b radio licensee, I roasted the surface of my right pointer finger - hitting transmit on a HF radio...it was due to the...antenna system! 
I'm not being rude, trying to save your life...and generations. Study it!