 Posted: Tue Sep 04, 2007 2:47 pm |
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| rrodolphe |
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| Joined: 30 Aug 2007 |
| Posts: 35 |
| Location: france |
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| hello I have buy et receive a wireless transmiter tm400 . I have try to make some measure to test it.
The configuration is a pc laptop, a interface AXYS, a bruel et kjaer microphone with a geffen preanmplier 48v
I make a measure direct microphone in my interface and microphone with wireless transmitter
the reponce is very diferent (see the document joint) Bleu with transmitter, Red without transmitter
can you help me?
thank you
rodolphe
sorry but i can put my picture
[img]C:\Documents and Settings\rroellinger\Bureau\courbe.PNGimg[/img] |
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| Posted: Tue Sep 11, 2007 6:57 pm |
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| Stefan |
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| Joined: 19 Apr 2005 |
| Posts: 167 |
| Location: Berlin, Germany |
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| Email response by Jim Mobley
| Quote: | Dear Rodolphe,
Your attachment was stripped off by the Forum, can you send it to me directly?
Your setup should work fine, the TM400 is an excellent product--we use one frequently. I can offer some general trouble shooting tips.
1) Be sure that nothing is clipping and that you have a good signal to the input of the sound card.
2) We've seen some problems with the TM400 transmitter being unable to supply enough phantom power for some measurement mics. In some cases this can be resolved by inverting the polarity with an adaptor between the mic and the transmitter.
3) Test the RF section as a piece of wire by driving the transmitter directly from the sound card. Be sure to SWITCH OFF PHANTOM POWER AT THE TRANSMITER TO AVOID DAMAGING THE OUTPUTS OF THE SOUND CARD.
If you can send the measurements instead of the screen shot, that would be better.
Best regards,
Jim Mobley
Sr. Application Engineer
Renkus-Heinz, Inc.
19201 Cook St.
Foothill Ranch, CA 92610
TEL: +1-949-588-9997
FAX: +1-949-588-9514
www.renkus-heinz.com
mailto:jim@renkus-heinz.com |
Stefan |
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| Posted: Wed Sep 12, 2007 8:48 am |
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| rrodolphe |
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| Joined: 30 Aug 2007 |
| Posts: 35 |
| Location: france |
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| thank you for the responce, the first and third point are good.
I have found the problem, the second point with microtech gefell preamplifier the signel must be reverse with an adaptator.
i dont understand the problem of polarity .
but all is well
roodlphe |
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