Your question has me confused. Wouldn't you only need to enter any frequency if it is not one already in the HP-1 DB? If it is not already in the HP-1 DB (or the RR DB), how would you know it is P25 (if you only know the frequency)? Is it a Control Channel? An alternate CC? A single frequency that many Talk Groups might use at various times? Single site or multi-site P25 System? Simulcast System? And only knowing a "frequency", how would one answer any of these questions? I think more info is needed in order to discuss your question/situation with any confidence.Does anyone know the step by step in how to enter a single channel P25 if all you know is the frequency,I did it on my 996xt and it worked but not on the Hp.Thank you.