Originally Posted by jackson_wr
Nice install. I was having a discussion about this radio on the BMWST forum. I noticed that you are concerned about running this at high power. I was concerned for another reason. Overloading the bikes electronics (i.e. engine management controls etc.). Have you tried it? Also I saw that you are running your through the Autocom system. I was going to try going bluetooth and going with a bluetooth mounted head set in my helmet.
Many thanks, in advance for your response.
Good questions. I did the RF power density calculation for this system at high power for both 2M and 70CM. At the riders seat, it is probably right at MPE or just below, and at the pillion it is most certainly over MPE (for a controlled environment, well over for an uncontrolled environment). Low and medium power levels are OK.
As for the power load, at high power the radio draws about 117W. I seem to recall the alternator on the LT is something like 840W, but I have no idea what the various systems on the bike draw. The power sockets are rated at 60W each, so that would suggest that the electrical system can handle at least 120W of additional load. If you start loading those up with heated gear and then run the radio at high power, I suppose you could overload the electrical system, especially if the battery is weak. At low power the radio draws about 28W which should pose no problem for the electrical system, even with additional accessories running.
I have not had a chance yet to do extensive "on the road" testing of this installation (darn rain!). In addition to the power loads, it will be interesting to see if RF causes any problems with the bike engine management computer and brake systems (or for that matter, the entertainment system). I will follow up here when I have done that.
Since I already have the Autocom setup, I did not consider Bluetooth. My biggest concern with BT would be getting the VOX gain set right. There are only 2 settings for VOX gain (high and low) which might not be enough range for the noise levels encountered at various speeds. Of course, you could use the PTT switch on the control head and not use VOX, but that seems rather clumsy. I suppose you could install a PTT switch on the bars and connect it to the mic jack on the back of the radio, as long as that works during BT operation. The owners manual is not real detailed on BT operation.