Let me elaborate on Jardy's answer.
The topic of modifications is forbidden on this forum. From the "About" on this forum:
"Note: Many individuals join this list to find out how to modify their unit for extended transmit. In the USA, it is against FCC regulations to use a modified amateur radio transmitter on commercial frequencies, even if you are licensed to use those frequencies. If you wish modification information, go to www.mods.dk . DO NOT use this list to debate the above issue. This topic has been permanently closed on this list."
The ?site does appear to have entries relevant to your topic. If they do not fit your needs, perhaps you should post a question there.
Greg
K0MGL
Greg Liverman