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Joying JY-UL135 Poor Radio Reception

Anyone else have poor radio reception with the Joying JL-UL135? Previous radios in my 2001 Suburban picked up local stations just fine. This one has a hard time picking up even local stations. I double checked my antenna connections and even bought an amplified antenna. No change. In fact, the radio reception is exactly the same weather the antenna cable is plugged into the back of the radio or not. Is it possible the radio antenna port is not connected internally to the radio?
For reference, this is my radio:
https://www.carjoying.com/android-5...0-radio-stereo-audio-16gb-support-revers.html

Are you certain that your car doesn't have a hidden antenna amplifier somewhere? If it does, it needs to be powered. Make sure to run the antenna power lead to the antenna amplifier.

I'm positive my Suburban doesn't have a hidden antenna amplifier. I recently installed an amplified antenna along with the OEM antenna and it didn't change. After a little more research it seems that the antenna ground internally to some of these radios never got soldered. I may have to pull the radio, open it up and inspect.

Before you go to that extreme, try hooking up a piece of unshielded/ungrounded wire to the center pin in the back of the antenna jack on the head unit, and hold it up. If the wire all by itself improves radio reception better than hooking up the actual car antenna, then you need to look into vehicle side. If it does not, then you need to look at the connection for the center pin on the head unit.
The antenna ground itself doesn't do anything besides shield the antenna cable between the head unit and the antenna base. So if the wire doesn't work, it would suggest that the main antenna pin (not the ground) is not connected.

MikeS1971 said:
Anyone else have poor radio reception with the Joying JL-UL135? Previous radios in my 2001 Suburban picked up local stations just fine. This one has a hard time picking up even local stations. I double checked my antenna connections and even bought an amplified antenna. No change. In fact, the radio reception is exactly the same weather the antenna cable is plugged into the back of the radio or not. Is it possible the radio antenna port is not connected internally to the radio?
For reference, this is my radio:
https://www.carjoying.com/android-5...0-radio-stereo-audio-16gb-support-revers.html
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Click to collapse
I had the same issue and it turned out to be the radio app itself. The original app worked fine, then I installed a themed version and my radio just would not pick up any signals. Then I uninstalled that themed version and the previous app worked fine.

FM not working

New to this forum. Hope it is in the right place. I tried to search for anything that matched and did not find anything similar. I have a Tocado 7.1 Android Chinese Headunit I purchased from ebay. My FM stopped working a while back. There is static but no stations attempt to come in. Search just runs through the whole dial and then starts over with no stations found. I have tested the antenna with the OEM radio and it does work correctly. I can get AM but it is not strong. I have tried to change the region to no avail. If anyone has any ideas, I would appreciate it.

Do you have power injector adapter with the chinese head unit?

I’m a noob. Not sure what that is.

I had a similar problem on my Subaru
I didn't realize that there is a small amplifier connected to the antenna (probably very close to the antenna, which in my case is part of the rear window on the tailgate).
This needs to be supplied with 12V otherwise you get hardly any (or no signal at all) down the cable from the antenna.
I bought a Subaru to ISO adapter kit, and one of the wires in the ISO plug is the antenna power. However my Xtrons unit, just has a wire from its ISO socket which doesn't connect to anything.
So no power was going to the antenna amplifier.
The solution is to connect the Accessory power going into the head-unit, to the antenna power wire.
Ideally connect it on the side of the fuse that connects to your head-unit, so that the power is then protected by the fuse.
Warning.
Make sure you are applying the Accessory power to the correct wire, and that your antenna amplifier requires 12V
What I had to do, was to reconnect my old CD / Radio unit, and measure the voltage on the pin for the antenna amplifier.
On my old CD / Radio unit, when I switched to the radio, 12V appeared on one of the pins on the plug into the back of the radio.
I double checked the pin on that Subaru radio plug, against a pinout I found on the internet, to confirm it was what people thought was the antenna power pin.
Once I was fairly certain that I knew which pin it was (and that the wire from the ISO socket on the xtrons ISO socket labeled something like "Auto Radio" was the same connection), I applied 12V to that pin via a amp meter (actually a multimeter on its millamp setting), and I confirmed it wasnt taking loads of current.
As I'm an electronics engineer I have several multimeters including the old style analog meters which have a needle. The analog ones are great for testing this sort of stuff, as you can see by briefly tapping the connection if its taking a lot of current or not.
In my case the meter hardly registered, as the antenna amplifier takes less than 50 milliamps.
Anyway, finally checked that the radio was now working on the new head unit (Xtrons GS PX5 Oreo), and it works working fine both on AM and FM.

Thanks for the reply. I have a 2006 F 150. There is no amplifier on this vehicle. I should have shared that originally the radio worked fine. I usually just use the BT and stream music from Pandora. One day after several months, I decided to turn on the radio because I was in a dead zone. To my surprise, the FM just had static. Seek found no stations and I tried to manually tune to a known station and it did not come in. There is no change in the sound of the static when a station is at the setting. I also reconnected my OEM radio to the antenna to be sure it was not the antenna. It worked just fine.

OK.
I didn't think I my Subaru had antenna amplifier... But I does

What GPS antennas do these units use ?

Does anyone know what type of GPS antenna's these units use?
I have an Xtrons PX5 Oreo head unit, but I'm having difficulty positioning the GPS antenna in a good location, due to lack of space under the dashboard.
I'd like to buy another antenna, to take apart and get rid of the plastic cover, in the hope that it will be a bit smaller and I can squeeze it under the dash
However I'm not sure if all antennas that I can buy are the same.
The socket type on the back of the Xtrons unit appears to be a type called FAKRA, and the antenna that came with the unit has a right angle connector.
I can find loads of similar looking antennas on eBay and AliExpress etc, with FAKRA plugs, but most of them are straight (so I'll need to check if a longer plug would be a problem.)
But apart from that... Does anyone know if there is anything specific I need to look out for when buying another GPS antenna ?
Some antennas say they are "Active" and are powered by between 3 and 5V, but I presume they are all like this ?
Also, I've seen splitter cables, which would suggest that I could install more than one GPS antenna, but I'm not really sure if thats possible either ??
Thanks

RogerClark said:
Does anyone know what type of GPS antenna's these units use?
I have an Xtrons PX5 Oreo head unit, but I'm having difficulty positioning the GPS antenna in a good location, due to lack of space under the dashboard.
I'd like to buy another antenna, to take apart and get rid of the plastic cover, in the hope that it will be a bit smaller and I can squeeze it under the dash
However I'm not sure if all antennas that I can buy are the same.
The socket type on the back of the Xtrons unit appears to be a type called FAKRA, and the antenna that came with the unit has a right angle connector.
I can find loads of similar looking antennas on eBay and AliExpress etc, with FAKRA plugs, but most of them are straight (so I'll need to check if a longer plug would be a problem.)
But apart from that... Does anyone know if there is anything specific I need to look out for when buying another GPS antenna ?
Some antennas say they are "Active" and are powered by between 3 and 5V, but I presume they are all like this ?
Also, I've seen splitter cables, which would suggest that I could install more than one GPS antenna, but I'm not really sure if thats possible either ??
Thanks
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Click to collapse
What for a car do you have? (brand & model)

Xtrons TE706PL. It has a FAKRA connector on the back.
Since I posted, I've ordered a generic GPS antenna from AliExpress which has a FAKRA connector on it, (for less than $10)...
So I'll see if that works.
What I don't know however if these antennas are Passive or Active. I presume they are mostly Active, where between 3 and 5 volts is supplied to the antenna, via the same cable (coax) where the signals are sent into the unit (capacitive coupling)
As GPS signals are at 1500Mhz, the loss on thin coax is extreme, so I'd be surprised if any of these antennas, which come with several metres of coax, are passive.
(But I could be wrong.. In which case I'll probably also try to shorten the coax to just the length I need, as that will also improve GPS reception)

RogerClark said:
What I don't know however if these antennas are Passive or Active. I presume they are mostly Active, where between 3 and 5 volts is supplied to the antenna, via the same cable (coax) where the signals are sent into the unit (capacitive coupling)
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What was your determination on this. Does the radio use an active antenna or passive?

btw, its an active antenna. I bought a replacement antenna from anywhere they sell active gps antennas.

no AM reception, but good FM reception - wrong radio region?

Apologize if this is the wrong forum to post this in, but I just installed an Android 8.1 head unit in my car in the USA, and I get great FM reception, but I can't get reception for any AM stations. I disconnected the unit and reconnected my old radio to make sure nothing had changed in the car, and I still got good FM and AM with the old radio, so I know the antenna is good.
Is there a setting in the radio for region (USA, Europe, China, etc) that could affect this? When I scan stations, it seems to be in the right range of frequencies, but doesn't stop on any, and I can't manually force it to a station that I know (950). Instead I can make it go to either 945 or 954. I have searched through all of the menus that I can find, and can't find anything that would allow me to see or change the region.
Thanks in advance - Paul

Update on this issue - I was able to get to the menu to change the radio region:
Car Settings:: About the Device (passcode 8888):: Radio
It was defaulted to Europe - I changed it to America 1 and America 2 which at least allowed me to directly tune to a couple of strong AM stations that I know, but I still had no reception. Everything else about the unit works well. I am trying to get them to send me a replacement thinking it is something in the hardware, but please let me know if anyone has any other ideas on things to check.

I have this problem too. Great FM reception, VERY poor AM reception. I've tried all country codes (Australia is not available). I've asked vendor for a solution. Still waiting.
Did you get a solution?

I had this too until I realized that my car has a built in car antenna amplifier (most cars now do) and it needs to be powered. Without power to it, you'll barely get reception. So I connected the antenna amplifier to the powered antenna output from the head unit and that improved it some, but still it wasn't great. Then I checked the voltage from that wire I found that the head unit only puts out 10.6 volts instead of the required 12. So I hooked the power antenna to the same 12V power coming from the car that feeds the head unit and presto, now I get normal radio reception like I used to.

This constantly amazes me, why do so many people not understand about the aerial amplifiers used on most cars now? When you swap out a manufacturer specific unit, make sure all the wires are connected, they're there for a reason!

yes, but most people don't realize that the lead from the head unit that says ANTENNA is not suitable to power the antenna. You must use the 12V power supply coming from the car to power the antenna amp.

It varies with the head unit, many do put out the full battery voltage on the antenna feed wire (ours does) but obviously some don't, your fix is correct for those that don't. The issue is that everyone seems to just leave the amplifier wire disconnected and wonder why it doesn't work.

Mr.TT_NZ said:
This constantly amazes me, why do so many people not understand about the aerial amplifiers used on most cars now? When you swap out a manufacturer specific unit, make sure all the wires are connected, they're there for a reason!
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Click to collapse
I know this is an old post but I'm having this issue.
I'm actually little confused as to how to remedy this.
Any help would be appreciated.
Should I splice the blue ant wire into the power wire going to the radio?
I was under the impression the blue ant wire was for people who had a power antenna that raises and lowers when the radio is powered on.
Here's the radio I got for a 2005 Corolla.
US $195.00 20%OFF | For Toyota Corolla E120 E 120 BYD F3 2000 2003 2005 2006 DSP 4GB+64GB Android 2 Din Car Radio Multimedia Carplay GPS Navigation
https://a.aliexpress.com/_mPnUCX6

jnotgsure said:
I know this is an old post but I'm having this issue.
I'm actually little confused as to how to remedy this.
Any help would be appreciated.
Should I splice the blue ant wire into the power wire going to the radio?
Click to expand...
Click to collapse
The ANT wire of the head unit is intended as power supply for the car antenna. Not only the automatic extending antennas need a power supply, also active antennas.
So it depends on your installed antenna if you need to connect it.
Some active antennas doesn't have a separate wire for power supply. In this case you need a "Phantomeinspeiseadapter" (Google it). Espacially cars from VW group (Skoda, Seat, VW, Audi...) need such an adapter in combination with a 3rd party radio.
The idea is to power the antenna only if it's needed (your listening to radio).
Alternatively the antenna could get its power from the ACC wire. In this case the antenna gets power as soon as you turn on the ignition.
The B+ wire should never be used to power the antenna because this would drain your cars battery 24/7.

Dab+ USB Antenna

Is there a difference in signal quality in these window antennas? I am wondering if swapping the one i have now will boost signal?
My original car radio only had FM which worked flawless. Since upgrading to the android head-unit…FM is impossible to listen, strange as it uses the same car antenna to connect into it?
I opted to buy a DAB+ antenna as the head unit will accept one but this is not great either. Any ideas?

You may have an active antenna on your cars roof and missed to connect the power supply.
I only have bad experience with the DAB windows antennas so I was forced to replace the existing antenna.