Jump to content

IFB UM400a Audio Fades Away


Brians1684

Recommended Posts

Seeing if anyone has had this issue with the Lectrosonics UM400a BLK 26 in IFB mode. The issue encountered is, after about 10 min of good strong audio sending to multiple R1a units on set. The audio just fades away, comes back and then fade away. Here are all the things tried and observed to solve the issue. When I send it back to Lectrosonics how should I describe it? So I don't get a message back "We can't find anything wrong." because it looks and acts fine at first, but it seems to take a few minutes for it to happen.

Thanks

 

Observations:

1. Still solid green power light on UM400a

2. Green modulation on audio lights on UM400a

3. 3 other identical setup bag rigs with own IFB UM400a on other frequencies (swapped with others for testing) same result with bad unit

4. Sound Devices 664 x1 out put is used on all bags (swapped with others for testing) same result

5. Ta3 -Ta5 cables (swapped with others for testing) same result

6. Uses 9v eliminator (swapped with others for testing) same result

7. IFB is five frequency blocks away from nearest other Lectros on set and changed multiple times to clear channels and checked with other bags IFB to not be intermod.

8. Power cycle unit for 30 sec. fixes issue for about 10 minutes

9. Running just one bag or all bags with IFBs and same result with bad unit

 

Link to comment
Share on other sites

  • 2 weeks later...

Seeing if anyone has had this issue with the Lectrosonics UM400a BLK 26 in IFB mode. The issue encountered is, after about 10 min of good strong audio sending to multiple R1a units on set. The audio just fades away, comes back and then fade away. Here are all the things tried and observed to solve the issue. When I send it back to Lectrosonics how should I describe it? So I don't get a message back "We can't find anything wrong." because it looks and acts fine at first, but it seems to take a few minutes for it to happen.

Thanks

 

Observations:

1. Still solid green power light on UM400a

2. Green modulation on audio lights on UM400a

3. 3 other identical setup bag rigs with own IFB UM400a on other frequencies (swapped with others for testing) same result with bad unit

4. Sound Devices 664 x1 out put is used on all bags (swapped with others for testing) same result

5. Ta3 -Ta5 cables (swapped with others for testing) same result

6. Uses 9v eliminator (swapped with others for testing) same result

7. IFB is five frequency blocks away from nearest other Lectros on set and changed multiple times to clear channels and checked with other bags IFB to not be intermod.

8. Power cycle unit for 30 sec. fixes issue for about 10 minutes

9. Running just one bag or all bags with IFBs and same result with bad unit

Hi Brian,

You seem to have done a good job of testing the unit and describing the problem. Send in a copy of your results with the unit and the crew should have no problem. From what you've said, this isn't an intermittent problem; it just takes a while to develop. 

 

Years ago we received a battery powered wireless sound system from an auctioneer, with a rather terse description of the problem.  On a scrap of paper, in pencil was written "The motor is broken."

 

You are doing much better than that.

Best Regards,

Larry Fisher

Lectrosonics

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...