Problems with Williams Sound PPA T27 Transmitter

[dave.swartz]

Russell is pointing you in the right direction. As the original investigator of this issue we found that the stock church standard microphone from Williams AV is defective. They have reported to me that their entire manufacturing lot from their contact manufacturer is defective. There are untold numbers of these bad microphones in use by church units. The resolution is to have Williams AV replace the defective microphone with a different model that is not affected by this defect.

For our stake we have three units that use translation equipment. Before the swap none of the transmitters had proper deviation even at max gain. The replacement microphones are sensitive and work well. The vendor knows that this is a problem and was very good about replacing the defective microphones with a different model that does work.

Please be respectful and kind when reaching out to the vendor. They had no idea they had this problem until I reached out to them with quantitative test results. A simple replacement of the mic would be good to try.

For our units the transmitter and interpreter are in the chapel. This is a very low power system and distance / walls will significantly attenuate the signal.

All the best.

[robyoungberg]

Hi, OP, do you still use the rubber duckie antenna that came with the T27? or did you switch to the 39" one, or the 22' cable with the 80" of effective antenna at the end? We begin having issues at approx. 50 feet from the transmitter, but maybe the transmitter just needs to be higher (currently on one of those church building tables near one of the chapel entrances). A bunch of random static hits. I know it's not the mic in my case because we use a different headset hooked up to a mixer that then feeds to the transmitter via XLR.

[dave.swartz]

For weekly meeting we use the small antenna, but the transmitter is in the chapel. This transmitter is very low power and the antenna gain is very poor. If it’s in a different room you will have performance issues.

For stake conf supporting 4 languages we use a completely different transmission scheme with dipole antennas and Listen transmitters. We do this because the stake president doesn’t want interpreters in the chapel and technology, per his requirements, needs to be invisible. The interpreters are in the children’s meeting room and we send the audio over IP ( AVB ) to the transmitters and zoom interpreter computers located elsewhere in the building.