I'm not sure exactly what you need... There is no need to be decoding PL tones, especially if they are all using the same tone...Just tune your scanner to 154.3400, and you will hear all local traffic, regardless of PL tone. THe only reason you would want to use a PL tone on your end was if you needed to filter out other transmissions on the same frequency that you dont care about.
This is the correct frequency according to the DB, and there would not be any type of digital system, trunked system, or encryption on that frequency. SO, with a scanner set to 154.3400, you should hear all companies in the Berlin FD no problem.