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Laurence T

COS-11D SMQV transmitters gain issues

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Yes remove the resistor and wire the white wire to pin 5 for servo bias wiring. 

 

Shouldn't assume, early on I had issues getting lavs through b&h

 

 

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11 hours ago, Laurence T said:

I had exposed the connecter and have found the following. Could anyone perhaps tell me if this is correct? 

 

Pin 1 -white (audio?) to a resistor, and another wire I think is the shield

 

pin 2 - 4 jump

 

pin 3 - black (bias?)

 

this seems to match up with fig 5 in lectrosonics wiring diagrams.

 

 

The white is bias and the black is audio. Pin 1 is the ground, Pin 3 is mic level audio and pin 5 is line level.

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Hi Laurence,

 

I've tried to contact you several times about this...left a couple of voicemails and and email and haven't heard back from you. We even tried to contact you over the weekend when we saw your tweet and never heard back from you. It looks like we shipped the reduced sensitivity by mistake. I'd be happy to exchange them for you. I just need you to get back to me so we can arrange the exchange. My email is davef@dvestore.com or you can call me at 360-653-7063. We don't wire these ourselves. We order them from Plus24 already wired. 

 

-Dave Fisk

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The 10k resistor is not correct in any case for any COS-11, be it reduced sensitivity, enhanced sensitivity or ribbed. A 1k resistor is shown in our recommended wiring diagram, This will give you 20 dB more signal which should solve the problem, all ribbing aside. Lectro will send you some tiny 1/10th Watt resistors free of charge if you ask service at 1-800 821-1121. 

Best Regards,

Larry Fisher

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On 10/14/2017 at 7:19 PM, Laurence T said:

Thank you for all your help guys, really appreciate it.

It actually wasn’t from B&H!

Am I right in thinking that if I remove the resistor completely, and attach the white wire straight to pin 5, it will be the correct (and non universal) servo bias wiring?

Yes.

LEF

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