The Hytera MD785(G) DMR transceiver works great out of the box, both analogue as digital. But there is one problem. Noise coming out of the speaker. Even when the tansceivers audio gain botton is set to zero. When the squelch opens, noise can be heard. There is no way to fix this in the firmware of CPS codeplug by programming.
The modification is to put a 22 Ohm resistor in serie with the speaker. So, hardware needs to be mobified. The good news: The modification is easy and no SMD needs to be soldered. Just remove the front of the MD785, carefully remove the flatcable and put a 22 Ohm (variable) resister in series with the red speakerwire. That’s all.
Now reprogram you radio and set the speaker output level for both analog and digital by +2 or +3 db as compensation for the resistor you’ve just placed. Upload the codeplug and you’re done. The noise is gone.