Just a further update, the radio is still working fine, so the regulator swap was a total success.
One other thing I did whilst it was all in pieces was to route audio from the external speaker socket to the RJ45 Microphone socket so I can make up a headset that plugs in via a single plug.
Totally crazy that they haven't done this from the factory, why you would want the mic / ptt on one side of the radio and the earpiece on a seperate plu on the other side of the radio is beyond me
There is a spare unused pin on the socket (Pin 2 I would call it, it is between the pin which carries +8v and the pin labelled? MSVSW).
I simply routed a piece of thin Wire Wrap wire from pin 2 of the RJ45 across the PCB to the center pin of the 3.5mm LS jack socket on the same PCB, I tacked it down to the PCB with wire-Tak, taking the audio from this point allows me to plug a empty 3.5mm jack into the socket to defeat the internal loudspeaker when using the headset.
The only issue I had was getting the external PTT on the RJ45 to work, it simply refused to key the radio, I fiddled about with the settings in the menu's but could not get it to work.
I ended up taking the original microphone apart which worked fine to key the radio and measuring the voltages on the pins.
It turns out that the RJ45 pin 3 (MSVSW) needs to be grounded to make the external mic / ptt work.
So, knowing this I then made up a RJ45 lead using some 8 core screened cable making sure the screen was connected to the ground pin on the RJ45, the other end of the cable goes into a small box with a PTT switch and headset socket.
It all works perfectly there is no RF pickup on the headset (Senheizer call center type with twin earpieces and boom mic), I can either run it with the internal LS enabled, or plugging a blank 3.5mm jack plug into the LS socket kills the internal speaker but allows the headset to carry on working.
Tony?
G1HMO
