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RF and MKH50


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On 28 September 2018 at 11:34 PM, Bluelobster said:

No problems with RF, but I have had my mkh50 succumb to humidity!

 

Hey, Blue, it would be good to know in what circumstances (extreme?) - I would assume all mics are somewhat challenged by humidity but having lived and worked in the 'tropics' (HK, Thailand, Philippines) I have trusted my MKH, Bruel and Kjaer, and DPA to survive and function.

 

Cheers, Jez

 

And having just noticed New Brunswick maybe it's an extreme cold humidity? So is that the case?

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Hey Jez,

 

New Brunswick is certainly not as humid as the tropics, but where I am located can become quite humid in the summer. I had the mkh50 start squealing and give out while shooting an interior scene on a particularly humid day. Had to switch it for the 416 which has proven unstoppable!

 

Cheers,

Blue

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  • 2 years later...

Bringing this topic back to life.  Trying to resolve RF related issues on my beloved 50’s on my current show.  It seems to mostly come from remote RF dimmers on lite mats and or a very busy high RF noise floor modern film set.  Both 50’s are latest model, Allen screw at connector is snug, gold pins all there, etc.

 

My next step is try some jumper cable / connector mods and variations to help further shield the signal from the RF interference prone 50’s .  One thought is use an EMC connector on one end of a jumper that goes to our HMa which is from what I understand a ferrite bead which is simply a low pass filter around 10k.  I could see this solving high pitch buzzing issues but I’m also thinking of the lower swishy/bubbly type sound people have described here that also comes up?

 

Anyone have experience practical advice on RF connector shielding and or EMC connectors.  Or any other solutions that haven’t already been mentioned here.  Also is there such thing as a MKH50 RF tune up at the mothership if they are the newer variety?  

 

 

 

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Hi Michael, I have worked with mkh50 and -40 wirelessly for a long time and the microfones never had a problem.

To use EMC-Connectors is a good idea, because the connector extends the rf-safe housing of the mic over the open (not shielded) wires.

The gap ind the shield between the mic and the connector is the culprit in most cases because it is not symmetrically wired. (see pic).

cheers

Christian

 

HMaInputStageCopyrightbyLectrosonics.png

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