BK DPH Back to Back P25 Repeater

In this video I demonstrate how to connect 2 BK DPH portables to form a simple P25 onsite repeater. Using the rx audio and speaker enable line from a DPH acting as the receive portion of the repeater, passing that audio and ptt indication on to the DPH transmit radio.
The connections on the receive radio require fine soldering skills. If you aren't sure, try on some other junk board of the same dimensions until you perfect your technique. DPH's are great radios, use care.
The ptt and tx audio are done through the accessory connector on the transmit DPH. There is no modification to that radio at all, only the receive radio. The receive radio has a screw hole that the 2 wires can be fed through.

[@kb9suy]

Hey Jim is this passive? Will it send p25 ID information through or just audio?

[@dc95811]

Just audio, the only id will be of the transmit portable. You can do analog to analog, or mix mode by the channels you select. The logic involved in passing ids is why P25 repeaters are so expensive. This is definitely a poor man's version. P25 on the receive makes it almost as good as a full priced repeater because the audio is perfect going into the transmitter, not adding noise.