Hi all,
We are using nRF51822-QFAA-R7 to develop our HUD system. The BLE connection is not stable some time.
For most iphone 6/6s, the BLE can connect for a short time (1-2s) and disconnect and reconnect for (1-2s).
We tested one iphone 5 and one iphone 5s, the connection has no problem.
Some time when the charging cable connected, the connection is unstable
Some time when the LTE and wifi turn off will help, but not quit repeatable.
Some time power cycle the whole HUD system (include the BLE) will help to get a stable connection.
We are using typical balun to match the impedance.
Signal level is not an issue. We tried to change the amplitude on receiver from -80dBm to -30dBm, but it doesn't make any difference.
The FCC report shows that our peak frequency is a little bit offset: 2.40214GHz. Would this be an issue?
The external crystal we are using is Epson crystal www.mouser.com/.../
It is 10ppm component.
I would appreciate a lot if there is any suggestions.
Thanks!
Peng
