B7 Symphony II PLUS installed into B6 2003 A4 with OEM Sirius Receiver/Tuner.
06-18-2007, 02:11 AM
#11
AudiWorld Super User
Thread Starter
UPDATE: Fault code with antenna. ...
OK, just scanned the HU, and I am getting an "open circuit" Antenna2 DTC, and an incorrect coding DTC, that I expected. I need to research the situation with the antenna DTC. The FM reception seems to be fine regardless.
As I understand the Sym II+ diversity antenna function, the HU actually uses two digital FM tuners, each tuner having a seperate HF signal source, and uses the tuner having the strongest signal. As a practical matter, I am listening to SAT 99 percent of the time, so this isn't a major glitch in my case.
As I understand the Sym II+ diversity antenna function, the HU actually uses two digital FM tuners, each tuner having a seperate HF signal source, and uses the tuner having the strongest signal. As a practical matter, I am listening to SAT 99 percent of the time, so this isn't a major glitch in my case.
07-04-2007, 01:27 AM
#15
AudiWorld Super User
Thread Starter
New update: DTC for incorrect coding fixed. ..
The Antenna 2 DTC "open circuit" is caused by the difference in the antenna layout between the '03 diversity switching antenna setup, and the B7 dual antenna arrays with seperate signal amps, sending seperate signals to the two Antenna inputs on the Sym II +. I have not been concerned about the FM relying on only one antenna signal, this defeats the dual switching digital tuner diversity scheme of the Sym II+, but my FM reception is fine as is, and I practically never listen to FM.
The switching antenna diversity setup on the B6, can be changed to the dual signal/dual tuner diversity setup used on the B7, by removing the switching antenna amp/diversity box, installing the two antenna signal amps from the B7, and running a second HF coaxial antenna lead to the HU.
OR, a splitter could by inserted in the existing HF coaxial cable, feeding both digital tuners with the same signal from the existing diversity switched antenna arrays, but this effectively defeats the Sym II+ dual antenna array/switched dual digital tuner diversity scheme also. And, without the feedback signal return on the ZF line back to the diversity box, that function is not active either. The relative need for a fully functioning FM/AM signal diversity, is dependent on the FM signal propagation characteristics and geography of the regional broadcast coverage areas applicable in each case.
The switching antenna diversity setup on the B6, can be changed to the dual signal/dual tuner diversity setup used on the B7, by removing the switching antenna amp/diversity box, installing the two antenna signal amps from the B7, and running a second HF coaxial antenna lead to the HU.
OR, a splitter could by inserted in the existing HF coaxial cable, feeding both digital tuners with the same signal from the existing diversity switched antenna arrays, but this effectively defeats the Sym II+ dual antenna array/switched dual digital tuner diversity scheme also. And, without the feedback signal return on the ZF line back to the diversity box, that function is not active either. The relative need for a fully functioning FM/AM signal diversity, is dependent on the FM signal propagation characteristics and geography of the regional broadcast coverage areas applicable in each case.
Thread
Thread Starter
Forum
Replies
Last Post
diagnosticator1
A4 (B6 Platform) Discussion
6
06-17-2007 09:45 AM
TT-Square
TT (Mk1) Discussion
16
01-05-2006 06:58 AM
Avantéix
Telematics Discussion
3
11-08-2005 09:27 PM
