Rational Acoustics



FILO4PRES
October 20th, 2010, 01:19 AM
Pretty sure we had a problem with using the TM1 with a TM400 transmitter. Solved the problem by using a short mic cable. I dont think there is a proper connection or fitting. Basically we got an intermittent signal on the transmitter.

Maybe others could also test...

adam
October 20th, 2010, 11:09 AM
Ya there is definitely something amiss there. We've had other reports of this same issue. They also noted that using a short cable resolved the issue. Lectrosonics was notified, though I've not heard anything beyond that.

Karl Winkler
October 22nd, 2010, 11:18 AM
Hi Guys,

Yes, there is a problem when using the UH400 or HM transmitters with the TM1. We have been discussing it with Audix, and we have a TM1 and they have an HM transmitter. So far, what we've learned is that the problem appears to be radio-frequency dependent, in that it is particularly bad in our blocks 20, 21 and 22. Higher blocks (like 25 & 26) don't appear to be affected nearly as much if at all. We believe it has something to do with the microphone or a trace within acting as an antenna at those frequencies. The body of the mic is just about the right length to be a 1/4 wave antenna centered somewhere around 540 MHz.

The only solution we know of at this point is to use a short XLR cable between the mic and transmitter. Not convenient, but it appears to work.

adam
October 22nd, 2010, 01:15 PM
Hi Guys,

Yes, there is a problem when using the UH400 or HM transmitters with the TM1. We have been discussing it with Audix, and we have a TM1 and they have an HM transmitter. So far, what we've learned is that the problem appears to be radio-frequency dependent, in that it is particularly bad in our blocks 20, 21 and 22. Higher blocks (like 25 & 26) don't appear to be affected nearly as much if at all. We believe it has something to do with the microphone or a trace within acting as an antenna at those frequencies. The body of the mic is just about the right length to be a 1/4 wave antenna centered somewhere around 540 MHz.

The only solution we know of at this point is to use a short XLR cable between the mic and transmitter. Not convenient, but it appears to work.

Karl,

Thanks for the info. Glad to hear you have a lead on the problem. Keep us posted.

-A

FILO4PRES
October 22nd, 2010, 05:42 PM
Works for me thanks for the confirmation we thought we were in sane....

At first we just used a short mic cable, but then grabbed a B&K mic ;-)