I worked on old TRC-97's in Korea A LONG TIME AGO (late 80's)
We had the old lolipop antennas for quad-diversity....
So to keep this thread related, some radio reception thoughts to ponder
I don't know why BMW doesn't do a software modification to allow the Radio Receiver to display Receive Signal Level (RSL) in dB's on the dasy in a troubleshooting menu.
That would give a CLEAR INDICATION of whether or not this is an issue with the antenna getting blocked by the windshield mounts or not.
My thinking is the brackets are either acting as a faraday cage of some sort OR we're getting multi-path reception hitting the antenna from multiple directions and 180 degrees out of phase.
If 180-degrees out of phase the resulting signal in the Receiver is ZERO signal (middle picture found during a quick google of "Phase cancellation")
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One option I'd LOVE to see is if someone with enough mechanical talent and 3D scanning/printing equipment could make those windshield brackets out of a plastic/polymer resin instead of metal.
Obviously they may not be as strong, however it would be a great test to prove/disprove the brackets as a source of signal blockage/cancellation.
I know I can just go buy a $20 (ish) antenna on Amazon/eBay/etc but I would much prefer the hidden antenna to function as it should (Though BMW NA told me on a phone call "It is working AS DESIGNED" to which I replied "then that is a shitty/worthless design" LOL
It looks like BMW may be giving me a refund on the radio instead of fixing the issue.
I'm still astounded that they didn't seem to do proper testing of the radio system in the USA before putting it into production.
I understand the difficulty as they would have to ship several test bikes to the USA to do the testing as the XM satellite signal footprint is only over North America & Central America.
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But still, for a Mfg of their size to not properly test this as well as not provide a fix this IS ridiculous....but I'm the dummy still paying Sirius XM for service LOL (in the hopes BMW will fix this soon)