stub27
Guest
I have a Super pro AVI 300, to which I want to connect a bike powered Garmin Quest, Via a RAM mount with a QPAC unit.
When I connect the Quest directly to AUX4 via a 4-pole - 2-pole cable, the volume in the helmet is quite loud, and the music input to AUX 2/3 is cut by 50% when the GPS is talking (as the manual says it should). But as the quest is bike powered I get interference when the engine is running.
This 50% cut does not happen if the volume on the Quest is set to halfway. So it appears that for AUX4 to reduce the level of AUX 2/3 by 50% the audio input into AUX4 must be above a certain level.
To overcome the interference, I bought a 1285 isolator, when this is used with a 3.5mm stereo-3.5mm mono lead between the quest and the 1285 unit, the GPS becomes almost inaudible (I’m only testing this in the garage with earplugs in) and the input into AUX2/3 is no longer reduced.
I have tried the 1285 into AUX 1 with the same cable connections to the GPS and input to AUX 2/3 is cut by 100%, as it states in the manual.
From the above, I think that the input into AUX 4 is working OK as it all works fine with no isolator in circuit.
The 1285 unit appears OK as it works when in AUX1, but it does appear to be reducing the output volume compared with the input volume
The problem appears to be that when the 1285 is put between the GPS and AUX4, the audio level into AUX4 is reduced to such a level that the 50% reduction (on AUX2/3) no longer happens, and as the audio level is so it is barely audible in the helmet.
I thought that an audio isolating unit should remove the ground loop but not affect the volume level, but I may be wrong about this.
Any thoughts or assistance would be greatly appreciated.
When I connect the Quest directly to AUX4 via a 4-pole - 2-pole cable, the volume in the helmet is quite loud, and the music input to AUX 2/3 is cut by 50% when the GPS is talking (as the manual says it should). But as the quest is bike powered I get interference when the engine is running.
This 50% cut does not happen if the volume on the Quest is set to halfway. So it appears that for AUX4 to reduce the level of AUX 2/3 by 50% the audio input into AUX4 must be above a certain level.
To overcome the interference, I bought a 1285 isolator, when this is used with a 3.5mm stereo-3.5mm mono lead between the quest and the 1285 unit, the GPS becomes almost inaudible (I’m only testing this in the garage with earplugs in) and the input into AUX2/3 is no longer reduced.
I have tried the 1285 into AUX 1 with the same cable connections to the GPS and input to AUX 2/3 is cut by 100%, as it states in the manual.
From the above, I think that the input into AUX 4 is working OK as it all works fine with no isolator in circuit.
The 1285 unit appears OK as it works when in AUX1, but it does appear to be reducing the output volume compared with the input volume
The problem appears to be that when the 1285 is put between the GPS and AUX4, the audio level into AUX4 is reduced to such a level that the 50% reduction (on AUX2/3) no longer happens, and as the audio level is so it is barely audible in the helmet.
I thought that an audio isolating unit should remove the ground loop but not affect the volume level, but I may be wrong about this.
Any thoughts or assistance would be greatly appreciated.
