Ok- I'll bite.
...with the Starcom Advance and have had my share of issues to figure out - ask me about magnetic tankbags...
The magnetic tank bag issue took a couple of weeks to figure out. Stupid. Stupid. Stupid. It seems so simple in hindsight. When TWN nut and I were setting up for our trip to NAFO and Hyder last year he kept picking up noise from my radio set up as we took shakedown runs through the hills of Socal. My transmissions were sometimes okay and sometimes garbled. Richard thought is was a problem with my radio. Tim thought it was wind noise because the problem got worse with increased speed. Then we thought it might be a connector issue (lots of those to check). Then we swapped cables (radio to Starcom, PTT to Starcom, Starcom to helmet). Maybe the Starcom itself. Swap my Advance for my old Starcom 1. Then we thought it might be a power source issue (I power my Starcom from a Powerlet outlet). Then we swapped radios. First mine for my spare, then mine for his, then used one of his on both bikes. Next, swap PTT switches. Too many variables to isolate one issue at a time and every time it was ride, test, stop, talk, gear off, swap parts, gear on, ride, test, stop, talk, gear off, etc.
Finally, with both bikes sitting side by side in my driveway, and with my Starcom being powered from Tim's bike, I finally
saw for the first time and started to laugh. We increased the throttle on my bike and the signal disintegrated. Not wind noise - engine speed! What is left? We've checked everything. Just then, enlightenment as I stared at the cable from my Starcom (under my seat) to the radio (on a RAM mount next to the brake reservoir). The cable was routed on top of the tank under my tank bag. My magnetic Chase Harper tank bag. Induction. Induction. Induction. Do not route your radio cable near magnets. Simple. Freakin' A.
So, now everything is basically okay although when using GMRS/FRS radios, one significant factor seems to be wind noise in the Starcom system. This results from speed, helmet/rider combination, windshield size/position, cross winds, microphone mounting variables, etc. Everyone's configuration and conditions are different and constantly changing. That said, when transmitting from my bike, I can usually be understood easily up to 50-60 mph. Above that, I find that if I tuck my head down behind the wind screen, speak slowly, enunciate clearly and, oddly, wait a full second before speaking after iniitally pressing the PTT switch that I can usually be heard, and understood.