Jump to content
Sign in to follow this  
mano

Sanken COS11D RF problem with A10

Recommended Posts

Hello everybody.
I have several Sanken COS11D wired by a local audio shop for the Audio LTD A10 transmitters.
Now I found that sometimes when quick dropping the TX in someones pocket, I get very nasty high frequency RF noise.
When I take the TX out and get the cable of the COS11D away from the whip antenna, it goes away.
I could reproduce this by coiling up the cable once or twice, holding it parallel to the antenna and moving it towards it. "Works" everytime.
Its really bad when the TX is on high power, but also on low power it is noticeable.
This does not happen with my DPA6060s - I can wrap that cable around the antenna if I wanted to and no noise at all.

Has anybody had similar problems?
Maybe the COS11D is wired wrong, so the "RF immunity" of the D series that Sanken says it has does not work properly?
Anyone with knowledge on correct wiring for A10s and RF rejection?

Any help is appreciated!
Thank you

Share this post


Link to post
Share on other sites

Hi Mano,

 

From what we know here at Wendy's it could be one of two things or both:

  • It might depend on the age of your Sankens as the  Sanken COS11D mics have better RF shielding than the older Sanken COS11 mics. You will need to check to see if you have the 'D' variant to verify.
  • The shield which goes to pin one in the 3 pin Lemo has possibly not been grounded to the shell. It is not required but it does help a lot. We typically wire a Sanken COS11 by splitting the center shield in half and putting half with white to pin 1 and black to pin 3. The other half we make sure is in contact with the shell of the Lemo.

Hope this helps.

 

-Nathan

Share this post


Link to post
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.

Sign in to follow this  

×
×
  • Create New...