![]() Ideally the SR10 would be mounted inside a fairing panel where it's inaccessible without tools and having it bike powered also turns it on and off with the bike. Furthermore, this is all mounted on a sport bike and is under the rear 'seat' which is a bit of a tight fit. When the SR10 and ham are bike powered, the noise makes the system unusable. Running with the ham and SR10 on internal batteries the noise is minimal, but still there (a regular audio isolation transformer is between the SR10 and the Valentine One). The SR10 is also connected to a Valentine One radar detector which is bike powered (and doesn't have a built-in battery). Ken, in my case the ham radio is connected to a bike mounted antenna and gets ground there even when running on its internal battery. I'm also considering replacing the regulator/rectifier on the bike to try to get a cleaner power signal to begin with. ![]() It would help to get some confirmation from Sena if there is a +5V output on the Hirose connector of the SR10 or not, as I need it to power the opto-isolator and would like to avoid bringing in another power source (with yet another ground point). I've seen conflicting pinouts of the SR10, some list a +5V line and others list that pin as a n/c. Having the isolation built in to the SR10 in the first place would have been the right way to handle this. I'm going to have to build a custom isolator for that which will preserve the PTT function and isolate that as well (preferably with an opto-isolator). The problem there is that a simple off-the-shelf ground-loop isolator wont work as the PTT of the radio is triggered by shorting the grounds of the speaker and microphone jacks (Kenwood style connector). Not only is the two-way radio bike powered, but it's also connected to an external antenna which is itself grounded to the bike. It's better without the radar detector connected, but still bad enough to trigger the SR10 if the SR10 is powered from the bike. ![]() I have a ground loop between that and the SR10 as well. I have one for the radar detector but haven't installed it yet. ![]() I'm aware of the ground loop isolators with 3.5mm connectors. ![]()
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