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joeydego

G90 Noise, Maybe Dead Receiver?

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Last gig, my 2 year old flawless G90 was putting out some funky noise. Here's a detailed synapsis. Line6 G90>TC Electric Gsystem 4CM to triple rec. with no transmitter powered on, no niose. With wireless unit removed from the signal chain and guitar>cable>G system input, no niose. As soon as I powered up a transmitter, high pitched noise and input to the G System was on fire. Switching out transmitters proved same probem. Any help? Sounds like a beat rackmounted receiver.

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When you power the transmitter on and hear the noise is any cable plugged into it?

 

Plug a cable in and short the tip and sleeve on the open end (wrap some tin foil around them). Do you hear the noise now?

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The noise happened both with and without cable connected to the transmitter. It also happened with 2 different transmitters and cables. I'm not in the same state as the rig right now to test but I will try that.

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It would seem that the receiver would be suspect but we should rule out a couple of other things first.

 

Try the shorted cable

 

Are the g90, TC and amp all plugged into the same power strip? They should be for best performance.

 

What firmware versions are the Tx's and receiver. If not the newest it certainly wouldn't hurt to get them upgraded.

 

Does the problem continue or was it one time only. One time only could point to some specific incident such as bad AC, or strange interference. While the radio cannot produce interference as audio it can get into cables.

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It would seem that the receiver would be suspect but we should rule out a couple of other things first.

 

Try the shorted cable

 

Are the g90, TC and amp all plugged into the same power strip? They should be for best performance.

 

What firmware versions are the Tx's and receiver. If not the newest it certainly wouldn't hurt to get them upgraded.

 

Does the problem continue or was it one time only. One time only could point to some specific incident such as bad AC, or strange interference. While the radio cannot produce interference as audio it can get into cables.

I will try the shorted cable. All involved units are plugged into a furman P1800 AR voltage regulator. I will verify firmware is up to date as well. The problem happened one time, at a venue I played with the same wireless before. 

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I had a similar issue last night. g-90 has been flawless for 2 years....(hundreds of gigs). Last night I powered up my rig.... power conditioner> Korg rack Tuner> G90> Eden WT800.

 

Before I could power up my transmitter a huge squealing noise occured. Thank goodness nothing blew up. Unplugged the tuner.... Still squealing.. Played the gig with a trusty cable>amp.

 

Is this a failure that others have experienced. Should I send the device for repair? Seems like it may be DOA. Don't have other receiver to download firmware.

 

I love my G-90... hate to think it's dead.

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Have you tried the unit again but in a different venue? With the transmitter turned off you should get no output from the receiver as there is a relay that shuts it off?

 

Were you passing signal THROUGH the Korg tuner or just sending signal TO it? As I recall there is some issue with Korg tuners.

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It appears a patch cord had an intermittent short. Once i replaced it, all is good.....

 

Lesson learned.... always spend an extra buck on a good patch cord. Never allow a $7 cord ruin your evening.

 

Cheers!

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Let me know if I should open a new thread instead of resurrecting this old one, but the above is what I experience too except that swapping cables make no difference.

 

My G90 has acted up producing horrible pink-noise some 10-20 times in the 4-5 years I've used it. When it happens the noise is only emitted when the transmitter is on, but my testing(below) clearly isolate the problem to come from the receiver. I have not been able to isolate an exact cause, but I have been able to rule out certain things. The unit is being used with a Kemper amp-sim, and is normally connected to the Kempers alternate input. When the problem occur I have never been able to resolve it other than leaving the unit off for a while. I usually resort to a using a regular cable and find that the G90 works fine next time i try it, a few hours or days later. It may be worth noticing that for me the problem always has appeared when the transmitter has been turned on after a pause/break (10+min) during which the receiver has been left on. The noise has never started while playing.

 

Testing:

 

Changing channels makes no difference.

 

Swapping the transmitter and or instrument2transmitter-cable makes no difference. My transmitter works fine on a different receiver (G50/55). I have never had access to another G90-receiver for test when I've had these problems.

 

Power-cycling the G90 makes no difference.

 

Replacing the patch-cord from the receiver to the amp makes no difference, yet plugging the patch-cord directly into the guitar works fine.

 

I've seen other people with the same problem suggesting on forums that moving out of reach with the transmitter active may trigger this problem, but anything intermittent should at least be solved by power-cycling the unit. I also find it hard to believe that such a problem would not be caught in product testing.

 

 

 

 

My remaining theory is that it either is some kind of environmental (radio/electromagnetic) interference causing this, or that something happens within the G90 so that it ends up in a bad state that takes a long time to clear. It should be next to impossible to inject noise into the encrypted stream between a digital transmitter and receiver. It would have to be something that directly affect the receiver. At a public venue just about every person present is carrying a radio-unit (smartphone) operating at nearby frequencies, but I have also experienced the problem at home. I live in the middle of nowhere and tried to turn off any 2.4GHz-gear in the building when the noise appeared, but that made no difference. 

 

For a while i suspected a ground-issue in the receiver because I once noticed that the power-cord was not properly seated in the receiver when it happened and that re-seating the cable and power-cycling unit seemed to fix the problem. However, I have since experienced the problem regardless of whether the unit is connected to a grounded outlet or not, and regardless of whether the power is supplied directly from the wall-outlet or via one of my Furman power-conditioners.

 

I don't have a XD-V75 which according to the documentation I've seen is required (horrible design) to upgrade the firmware in the G90-receiver. I do however believe that my G90 is more recent than the last firmware I've found that is issued in 2012.

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I am having the same issue. I tried different channels, transmitters, antennas, cables, etc.. I've gone through the same troubleshooting methods to no avail.

Similarly, my receiver was left on for a 20+/- minute break. Upon returning, and turning on transmitter.. voila.. static, fuzz, interference, screaming, death..

 

Did something internally cook? resistor?

 

 

 

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