I bought a used KT-76 transponder and the tray has the antenna connector with about 9" of coax attached. The coax doesn't have an identifier, but it is stiffer and a bit larger than RG-58u, which I have. I'm trying to figure how to connect the antenna. Can a length of RG-58u be spliced to the existing coax, and if so, any tips on how? Is there a source for the connector plug for the KT-76 to install new cable to, and if so, is RG-58u acceptable for this? thanks for the help