I can tell you that if you had of performed some searches on RCU for SV27, you would have found these threads and almost all of them talk about the problems with the stock SV27 radio.

http://www.rcuniverse.com/forum/m_54...tm.htm#5480011

http://www.rcuniverse.com/forum/m_51...tm.htm#5193877

http://www.rcuniverse.com/forum/m_63...tm.htm#6319908

Here are some more threads that may answer some more of your questions

http://www.rcuniverse.com/forum/m_48...tm.htm#4835624

http://www.rcuniverse.com/forum/m_48...tm.htm#4835667

http://www.rcuniverse.com/forum/m_48...tm.htm#4843027

Happy reading and welcome to RCU