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Sennheiser EW500 G3 static

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BradPinder:
Hi All,

I've just pulled my g3 belt pack out after quite a period of non use, and cannot seem to get static free operation. when running the belt pack transmitter, we hear bad static (sounds like pink noise) whenever it is turned on both through the main mixer, and also throws headphones plugged directly into the receiver (this is whether the microphone is plugged into the transmitter or not). We have a number of handhelds also operating (4 G3s and 2 G4s) that are all operating fine, with frequencies set as per the sennheiser banks (static does not change with other units turned on or off, so i don't think it is intermodulation related). I have rescanned several times, tried the belt pack into a different receiver (including using the same frequency as a handheld was using no problems). I have removed the receiver from the antenna system and gone back to the 1/4 wave antennas, i have tried various squelch, power, and sensitivity settings; and have tried the pilot tone both on and off. I have even pulled a belt pack transmitter from a camera pack and tuned to the same frequency. I've run out of things to vary (the i can think of at least); is there anything that could influence a belt pack but not a handheld signal?

it has been a while since we have used the belt pack, but i'm pretty sure the level of static is not normal. Any advice greatly appreciated.

thanks

Jason Glass:

--- Quote from: BradPinder on June 13, 2020, 10:28:25 pm ---Hi All,

I've just pulled my g3 belt pack out after quite a period of non use, and cannot seem to get static free operation. when running the belt pack transmitter, we hear bad static (sounds like pink noise) whenever it is turned on both through the main mixer, and also throws headphones plugged directly into the receiver (this is whether the microphone is plugged into the transmitter or not). We have a number of handhelds also operating (4 G3s and 2 G4s) that are all operating fine, with frequencies set as per the sennheiser banks (static does not change with other units turned on or off, so i don't think it is intermodulation related). I have rescanned several times, tried the belt pack into a different receiver (including using the same frequency as a handheld was using no problems). I have removed the receiver from the antenna system and gone back to the 1/4 wave antennas, i have tried various squelch, power, and sensitivity settings; and have tried the pilot tone both on and off. I have even pulled a belt pack transmitter from a camera pack and tuned to the same frequency. I've run out of things to vary (the i can think of at least); is there anything that could influence a belt pack but not a handheld signal?

it has been a while since we have used the belt pack, but i'm pretty sure the level of static is not normal. Any advice greatly appreciated.

thanks

--- End quote ---

You've obviously done the work to clearly determine that this specific TX device is malfunctioning.  G3 was discontinued on 7/1/2018.  If your TX is less than 2 years old, then of course you should pursue manufacturer support for that unit.  But don't expect anything for free after 1 year, especially for an officially obsolete model.  If it's older than that, then sadly, you've joined our old people's club of antique equipment owners.  There are so few failure points in these devices that are repairable, even by skilled SMD qualified bench techs, while they're currently offered products, that the manufacturers usually simply replace them or swap out entire PCB's.  Really, if it's beyond reflowing the solder on the the antenna terminals, volume pot pins, headphone jack pins, or battery contact pads, the pack is done and should be retired.

BradPinder:

--- Quote from: Jason Glass on June 13, 2020, 11:53:57 pm ---You've obviously done the work to clearly determine that this specific TX device is malfunctioning.  G3 was discontinued on 7/1/2018.  If your TX is less than 2 years old, then of course you should pursue manufacturer support for that unit.  But don't expect anything for free after 1 year, especially for an officially obsolete model.  If it's older than that, then sadly, you've joined our old people's club of antique equipment owners.  There are so few failure points in these devices that are repairable, even by skilled SMD qualified bench techs, while they're currently offered products, that the manufacturers usually simply replace them or swap out entire PCB's.  Really, if it's beyond reflowing the solder on the the antenna terminals, volume pot pins, headphone jack pins, or battery contact pads, the pack is done and should be retired.

--- End quote ---

Thanks Jason, interestingly enough i get the same issue with two different TX units, leading me to suspect that it is something more fundamental than a failed piece of hardware (unless both have failed in the same way). From a physics point of view i can't think of any interference that would affect the belt pack but not the handheld models though...

Russell Ault:

--- Quote from: BradPinder on June 14, 2020, 12:22:32 am ---Thanks Jason, interestingly enough i get the same issue with two different TX units, leading me to suspect that it is something more fundamental than a failed piece of hardware (unless both have failed in the same way). From a physics point of view i can't think of any interference that would affect the belt pack but not the handheld models though...

--- End quote ---

My recollection is that the G3 beltpack transmitters could be noisy with no source plugged in; is it possible that your microphone is toast? Do you have any other lavs (etc.) you could test the beltpack with?

The other thing to mention is that, depending on the application, the 3.5mm TRS connector on the beltpack (and the mic, for that matter) can be subject to corrosion, which can also cause noise (often intermittent). Spraying contact cleaner on the mic's plug, then inserting and giving it a good spin should take care of it if that is the problem.

-Russ

Tim McCulloch:
Hi Brad-

These aren't B or C band, are they?

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