I cannot start using my navi kit for many days because of one problem: I leave BT GPS receiver outside for at least 20 hrs to initialise, connect to device regularly, run NAVIGON and get always the same message - "A GPS receiver has been detected, but a convinient GPS signal is not available. The reception is obstructed, or the receiver is being initialised."
Any idea what to do?
Slaven, it could be a faulty receiver, do you have a program for viewing the signal and number of sats being received? It maybe also that the settings are wrong for the gps, what is the model of receiver you are using and details please of how you set it up when bonding etc. Have you carried out a factory reset of the receiver also? One other thing, sometimes a gps reciver will work much better for initialising first time if it is mobile rather than static, put it in the car and see if you have any results after a mile or 2. Try this program to test the gps function.
Please check your PM I have sent one to you. thanks.
I`m using BT GPS receiver delivered in original kit with Navigon 4 (made by GNS). I`ve bonded them regularly (XDA II asked for code and I entered 0000 - as described in operation manual). I have not performed factory reset of GPS rec. because don`t know how to do that. I couldn`t find any possible way to do that, except to remove BT and TMC moduls and I have done so.
Thank`s for gpsdiag, but I don`t know hoe to connect BT GPS with my notebook (with built in BT) to test it. Only service available is to connect it to serial port, but couldn`t. As you can conclude, I`m not very experienced with this, so I need really DETAILED help! Thank`s in advance.
Sorry, I sent the wrong version of diag, I will pm you the proper file.
The BT version of serail port on qtek is not compatible with wildcomm BT (used by navigon) got to navigon website and download the wildcomm patch
this will solve your problem
I was using navigon with wired gps and then tried bluetooth which dropped signal and refused to reconnect, thanks for the link I will try it.
Headset: Motorola S9-HD
ROM: Haykuro 6.0
Radio: ota-radio-2_22_19_26I
Issue: a2dp audio skips due to location of phone... or so it seemed. The audio would skip if the phone was placed across my body from the antenna or in a pocket.
Resolution: I began researching the bluez stack and found several places in the code that alluded to the hfp and a2dp being intertwined. This lead me to remember that android also attempts to switch between the hfp and a2dp for incoming calls.
I found that my headset was connected by default with both profiles active (not one at a time).
Thus after several test i found that disabling the hfp will eliminate the skipping.
Explanation: My best analysis is that the phone is keeping both profiles open at the expense of splitting the channel. Thus when the phone has gsm related events (incoming calls, tower hopping, background edge data) it is tying up the hfp by error thus causing a2dp to get reduced resources, low signal strength, and possibly packet collisions. Try for yourself. The skipping instantly stopped for me. Let me know how it goes for you! Thanks to all the devs for these great roms and info.
can i get an english translation lol jk...can u explain it in noob form
interesting, plausible explanation
where in the code do you make the change?
noob translation: turning off the headphone profile possibly frees up room for audio to stream uninterrupted...
ps. that might still confuse some... lol
alapapa said:
interesting, plausible explanation
where in the code do you make the change?
Click to expand...
Click to collapse
no changes were made yet... the bluez stack is written to have a bridge between a2dp and headphone profile. i think android is sending packets to the headset via hfp for gsm events. I would think android should discard the packets instead of sending them out and relying on the headset to ignore them.
i would think the code can't be changed without making LOTS of other changes... i would be essentially rewriting how android handles the two profiles at the same time. (ALOT of work)
if this ends up fixing it for everyone... then i might look into trying to increase a2dp's priority in transmitting or some other solutions...
crushsuitandtie said:
no changes were made yet... the bluez stack is written to have a bridge between a2dp and headphone profile. i think android is sending packets to the headset via hfp for gsm events. I would think android should discard the packets instead of sending them out and relying on the headset to ignore them.
i would think the code can't be changed without making LOTS of other changes... i would be essentially rewriting how android handles the two profiles at the same time. (ALOT of work)
if this ends up fixing it for everyone... then i might look into trying to increase a2dp's priority in transmitting or some other solutions...
Click to expand...
Click to collapse
i think I gotcha...you just killed the hfp profile on your PC or w/e...?
Menu button>Settings>Wireless Controls>Bluetooth Settings>(long press) Your headset name>Options...>uncheck phone....
thanks for that tip. i was cutting my grass the other day. g1 in rear pocket. stereo bluetooth headphones on. signal kept cutting out on me. i'm gonna try this and see if it helps.
crazythunder said:
thanks for that tip. i was cutting my grass the other day. g1 in rear pocket. stereo bluetooth headphones on. signal kept cutting out on me. i'm gonna try this and see if it helps.
Click to expand...
Click to collapse
No problem. I'm just trying to add something constructive around here. I'm still not even close to some of these guys.
Hey you're right! I just connected my S9 to "media" only (disabling the phone connection in bluetooth settings) and it doesn't skip anymore, even with wifi on! I'm going to give this a try on my sony head unit in my car when I get the chance and I'll report back.
DOHCtor said:
Hey you're right! I just connected my S9 to "media" only (disabling the phone connection in bluetooth settings) and it doesn't skip anymore, even with wifi on! I'm going to give this a try on my sony head unit in my car when I get the chance and I'll report back.
Click to expand...
Click to collapse
Glad to hear that! im back at work and its heavily laced with wifi and the building gets poor edge/3G signal.So if you walk out the entrance toward the parking lot, the phone would connect to the cell towers (plus the wifi antennas are strong here) and my headphones would skip almost non-stop. This no longer happens. I'm quite happy.
Interresting hypothesis. I have my phone relatively close to my headphones so it hasnt been a big problem. Wifi had to be off or it didnt matter how close.
Eventhough it defeats the purpose of my S9's I'm going to give it a try.
atoy74 said:
Interresting hypothesis. I have my phone relatively close to my headphones so it hasnt been a big problem. Wifi had to be off or it didnt matter how close.
Eventhough it defeats the purpose of my S9's I'm going to give it a try.
Click to expand...
Click to collapse
i kept wi-fi off because I was in the gym or walking to my car... it would skip an absurd amount and i would nearly throw my phone and headset 8 blocks from pure frustration. The crazy part is BT is easily strong enough to transmit from a pocket to a headset on my head. I like to think i am tall but not that tall and disproportionate that my pocket is over 30 feet from my head! lol.
any skipping from that short of a distance is actually indicative of a problem to me. Thats like putting on a normal earpiece and getting nothing but static from that distance.
1) tests with my Sony Ericcson K850i showed it wasn't the headset....
2) i sat the phone on the floor directly under me when i was benchpressing, and simply because i layed down and partially covered the back of the headset the music started skipping non-stop. covering the antenna can cause some interferance but honestly with the phone that close it really shouldnt matter...
Tried the same test with my K850... no skipping. Tried with hfp disabled.... no skipping. Turn on hfp and a2dp... skips heavily.
thats the short version of how i came up with the split bandwidth part of my theory.
crushsuitandtie said:
no changes were made yet... the bluez stack is written to have a bridge between a2dp and headphone profile. i think android is sending packets to the headset via hfp for gsm events. I would think android should discard the packets instead of sending them out and relying on the headset to ignore them.
i would think the code can't be changed without making LOTS of other changes... i would be essentially rewriting how android handles the two profiles at the same time. (ALOT of work)
if this ends up fixing it for everyone... then i might look into trying to increase a2dp's priority in transmitting or some other solutions...
Click to expand...
Click to collapse
The handsfree profile will periodically send out "indicators" for things such as battery status and signal strength. These are small packets, which in a well designed Bluetooth stack, should not cause any disruption in the A2DP stream. The thing to look for would be how data transmission is prioritized. If, for example, BlueZ simply sends data in a "round robin" style, then sending a small data packet may delay the transmission of an A2DP streaming packet just enough to cause the problems you are describing.
I'm using JF1.51 and am not experiencing any of the audio problems you describe, even with WiFi and Handsfree connections enabled. I ran some tests and used a Bluetooth sniffer to capture the data traffic. One time I did hear an audio dropout at about the same time that the phone sent a signal strength indicator, which doesn't exactly validate your theory, but does make me wonder. However, I only saw 5 indicators sent by the phone over a 30 minute session.
Does using this method affect you from using the headset for calls?
Am I understanding that you would use this to listen to music... and if a call comes in would would talk over the handset normal?
What I've found is using A2DP indoors works perfectly (with our without HFP.) The explanation I've read is that the 2.4GHz waves bounce off the walls enhancing reception. Once outside is when I see degradation of quality/drops which would support the theory.
You might be on to something. If the bandwidth is being cut to share data over two profiles then, once you step outside, you'll have less distance before data packets drop.
paesano said:
I'm using JF1.51 and am not experiencing any of the audio problems you describe, even with WiFi and Handsfree connections enabled. I ran some tests and used a Bluetooth sniffer to capture the data traffic. One time I did hear an audio dropout at about the same time that the phone sent a signal strength indicator, which doesn't exactly validate your theory, but does make me wonder. However, I only saw 5 indicators sent by the phone over a 30 minute session.
Click to expand...
Click to collapse
you might have misread one of my posts... what you descrribed is exactly what i was saying... gsm events are possibly clogging bandwidth for a2dp. the one time you heard it is what i am experiencing constantly in some areas.
it appears to be a combination of several factors that are somehow hitting some people all at once....
1)"gsm or phone events being broadcasted"
2) possible split BT channel for HFP and A2dp
3) weak overall BT signal strength from g1 (dialed down in drivers to save power?)
4) interference from other wifi sources (enterprise access points aka "High gain antennas")
P.S. I guess its obvious i'm a systems analyst... lol
this really does work!!!!
if you guys remember windows mobile , the BT stack by default is set with the bit pool min and max @ 31 ,it works great but the sound quality sucks.. if you use a registry editor and increase the max bit pool sound quality gets better, but if you go to high you would get the cliping that we now get . i used to do this with my wing , using this same S9 headphone ,the trick was not to go to high with max bitpool and to lower min to 12 and this worked great,, max was @ 46 min was @ 12 ,, no skipping at all.. and great sound . WE need to find a way to get these adjusted on android , this should fix
now i do believe the wing and G1 both use Broadcom stacks ,could be wrong>>
remember Schap's tools - Advanced Configuration this did the trick
crushsuitandtie said:
you might have misread one of my posts... what you descrribed is exactly what i was saying... gsm events are possibly clogging bandwidth for a2dp. the one time you heard it is what i am experiencing constantly in some areas.
it appears to be a combination of several factors that are somehow hitting some people all at once....
1)"gsm or phone events being broadcasted"
2) possible split BT channel for HFP and A2dp
3) weak overall BT signal strength from g1 (dialed down in drivers to save power?)
4) interference from other wifi sources (enterprise access points aka "High gain antennas")
P.S. I guess its obvious i'm a systems analyst... lol
Click to expand...
Click to collapse
Sorry, I must not have been very clear. I did understand what you were saying, and I confirmed seeing what you saw in the one dropout I heard. However, in my case, there were only 5 "GSM Events" during the duration of my test. Not really enough to cause a lot of trouble. I can see that if a lot of GSM events occur (The spec calls them indicators), then there could be a lot of errors. Perhaps this happens when the GSM signal is weak and constantly changing.
If you want to look at making changes to the Bluetooth software, here's my analysis of the 4 points above:
1) If a lot of indicators are being sent by the G1, then I can see that a Bluetooth stack implementation could have streaming audio problems if not properly implemented. Unfortunately, the only way to fix this problem is in software by only sending indicators (and any other data) "in between" the A2DP streaming packets. Streaming packets should never get delayed. It would be better to toss the streaming packet than to delay it.
2) When both HF and A2DP are connected, the signal is not actually split. They both have access to the full bandwidth of the Bluetooth stack. The only time that there would be a problem is when both are sending at the same time, which could cause an audio packet to get delayed in a transmit queue, causing a dropout (as described above). Perhaps BlueZ doesn't do a very good job of prioritizing data, so that audio data is never delayed by other data packets. In my opinion, #1 and #2 are the same problem.
3) A week BT signal would definitely cause this. I can reliably listen to stereo audio with my Sony headset at around 10-15 ft. Outside that range, I start to hear dropouts. Also, If I put my hands over the headset, I can cause dropouts at even 2 ft. So, your body will definitely cause problems if it gets in the way of the signal. Finally, the sensitivity of the radio on the headset will affect the range as well. It may or may not be possible to increase the TX power by sending the Bluetooth controller a command in the software. The only other solution is to try and not get in the way.
4) WiFi certainly can cause interference, as can a microwave oven. However, adaptive frequency hopping (AFH) should mitigate most problems. Perhaps AFH is not turned on for some reason, or there are multiple WiFi networks around, making it very difficult for the Bluetooth controller to find any reliable frequencies. AFH is turned on by sending the Bluetooth controller the command.
Hello,
I have some problems with my navigation in my car, i have a android navigation system with a gps receiver first it worked but at this moment he doesnt work very well
Today i buyed a new gps receiver and placed it on my roof of my car to get a better receive.
I have a program to test the gps receive and he sees 10 sattelites but only uses 3 of them constantly and number 4 is used 70% of the time but 30% not so my navigation program is constantly showing searching for gps signal.
sometimes i have luck and it has connected to 5 sattelites.
My question is he sees 10 satelites 1 has a terrible receive but my navigation is connection to that one but the other satellites have much better receive
So why does my navigation only connects to 3/4 when there are 9 good ones ? can i turn them on with a app or something or can i sellect other satelites or something?
XDA Visitor said:
Hello,
I have some problems with my navigation in my car, i have a android navigation system with a gps receiver first it worked but at this moment he doesnt work very well
Today i buyed a new gps receiver and placed it on my roof of my car to get a better receive.
I have a program to test the gps receive and he sees 10 sattelites but only uses 3 of them constantly and number 4 is used 70% of the time but 30% not so my navigation program is constantly showing searching for gps signal.
sometimes i have luck and it has connected to 5 sattelites.
My question is he sees 10 satelites 1 has a terrible receive but my navigation is connection to that one but the other satellites have much better receive
So why does my navigation only connects to 3/4 when there are 9 good ones ? can i turn them on with a app or something or can i sellect other satelites or something?
Click to expand...
Click to collapse
Greetings,
Thank you for using XDA Assist.
First, please create an account so you can post in the other sections.
Then you can post your questions here:
http://forum.xda-developers.com/general/help
You'll find expert advice there.
Good luck and welcome to XDA!
Hello,
I have some problems with my navigation in my car, i have a android navigation system with a gps receiver first it worked but at this moment he doesnt work very well
Today i buyed a new gps receiver and placed it on my roof of my car to get a better receive.
I have a program to test the gps receive and he sees 10 sattelites but only uses 3 of them constantly and number 4 is used 70% of the time but 30% not so my navigation program is constantly showing searching for gps signal.
sometimes i have luck and it has connected to 5 sattelites.
My question is he sees 10 satelites 1 has a terrible receive but my navigation is connection to that one but the other satellites have much better receive
So why does my navigation only connects to 3/4 when there are 9 good ones ? can i turn them on with a app or something or can i sellect other satelites or something?
XDA Visitor said:
Hello,
I have some problems with my navigation in my car, i have a android navigation system with a gps receiver first it worked but at this moment he doesnt work very well
Today i buyed a new gps receiver and placed it on my roof of my car to get a better receive.
I have a program to test the gps receive and he sees 10 sattelites but only uses 3 of them constantly and number 4 is used 70% of the time but 30% not so my navigation program is constantly showing searching for gps signal.
sometimes i have luck and it has connected to 5 sattelites.
My question is he sees 10 satelites 1 has a terrible receive but my navigation is connection to that one but the other satellites have much better receive
So why does my navigation only connects to 3/4 when there are 9 good ones ? can i turn them on with a app or something or can i sellect other satelites or something?
Click to expand...
Click to collapse
Already answered here:
http://forum.xda-developers.com/general/xda-assist/android-gps-navigation-problems-t3423302
Do not create duplicate posts.
Thread closed.
Has anyone come across or developed a software or prog that will read the hardware mcu signal level or value from the car fm aerial?
Not wifi, bluetooth, gsm etc.
I've looked for ages for a simple hardware meter type thing to measure the signal from my antenna, but no luck.
Most meters 'out there' are either very professional and expensive or are for transeiver type swr.
Thanks
Is it an MTCD type unit
Hi, yes it is. Why I posted in this group. It's possible though someone has made a general android app that is universal.
If it's even possible.