Alert Security Systems

[naa]

I have a two-camera system, both outdoors. They both work great, except that when the one in the front is in night vision mode, the audio feed carries with it a high pitched whistling sound. I've looked all around and can not find the source, I've tried reinstalling the latest firmware update, and I've tried blowing into the microphone (hoping there was a piece of dust or something in there causing the problem)

When the camera is on during the day, there is no problem, and the other camera in the back has no problem at all. The other wierd thing is that adjusting the microphone sensitivity has no bearing on the whine. It is exactly the same pitch and volume whether the sensitivity is at 5 or 100.

Any ideas would be greatly appreciated. Thank you.

[Trevor_F]

Could you contact support and send in a Diagnostic, or better yet send in the LogiNvrCoreWasatchEmbeddedDiag folder from the MicroSD card on that camera, so I can pass this on to our Engineers? We'll have a look in the logs and see if we can find an issue in the firmware that would cause that hum, or determine if it's hardware related.

[Kiwibloke]

I have exactly the same problem with the high pitched noise.  I have 3 cameras - two outdoors and one indoors.  One of the 700e cameras makes a high pitch noise on the audio only when night mode is switched on.  During the day it is fine.

[UselessS]

I had the same issue around a year ago ( pitch would change slightly over night...probably varied with temperature ) ...Logitech replaced that camera.  My sister-in-law has one with an oscillation as well, but hers goes away after around 15 minutes in night mode.

[Redford]

I also have this exact same problem as described above.  Happens the worst on 1 camera and occasionally on another, (The other 2 have never done it).  Always happens in night mode.  I can temporarily get it to go away by turning off the night vision mode.  I switch it back (because it is night) and within a 5-10 minutes, while it is running in night mode I start to hear a high pitched whine or whistle. 

I would have to think that we are not the only ones with this problem?

Any suggestions for fixes or repairs.  (The cameras are past their 1 year warranty and I would like to buy more but not if there are going to be issues as they age.)

[SteveGB]

Is the high pitched whine or whistle noticeable in the audio feed or can you hear it when standing by the camera?

[Kiwibloke]

The noise is (was) in the audio feed, not actually audible near the camera.  I took the camera back to the supplier and they swapped it for another unit.  Problem solved.

[GoldenPimp]

Same problem here.

Camera 1 has high pitch noise once night vision turns on, goes away after 15 to 30 minutes.

Camera 2 the noise stays through out night vision mode.

[UselessS]

As I mentioned earlier in this thread, I think your only option is to contact Logitech Support to get it replaced.

My opinion : It appears they have a circuit design issue...with component tolerances and temperature allowing some percentage of the 700e cameras ( maybe around 5% by my guess ) to have this oscillation issue.  I think they could correct the circuit design, and I also think their testing could find these units before shipping once they determine the conditions.

[skiracer]

I got the same issue for a camera purchased in Sept 2011.  Should i just contact Logitech support?