In the blog page: <goog_850139705> http://www.rowetel.com/?page_id=3902
It says: 1. *11. External Speaker – The SM1000 3.5mm sockets are wired to use stereo or mono plugs. If you wish to use a mono plug for Ext Spkr (CN9) remove the jumper J4 on the PCB. This prevents a mono plug shorting the speaker amplifier output to ground resulting in no audio. Note the first production SM1000 (Rev D) did not have jumper J4 and should only be used with a stereo plug.* I wonder if it should say: 1. 11. External Speaker – The SM1000 3.5mm sockets are wired to use stereo or mono plugs. If you wish to use a mono plug for Ext Spkr (*CN8*) remove the jumper *J2 *on the PCB. This prevents a mono plug shorting the speaker amplifier output to ground resulting in no audio. Note the first production SM1000 (Rev D) did not have jumper *J2* and should only be used with a stereo plug. J4 is the label on the speaker plug. CN9 seems to be the Ext PTT. FYI 73 steve
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