Pristine_Audio

I found this on another site describing pop noise on Shure PGXD 900 MHz digital wireless system: ******************************************************* In the United States, the PGXD operates in the 908 to 928 MHz band. Though this band is not used for broadcast TV, the 908 to 928 MHz band is used for other non-licensed wireless devices. These devices can be industrial, scientific, or medical. Here are examples of devices that are known to interfere with the PGXD: 1) Wireless network that reports a power outage to the local electric company. This device was located on a utility pole outside of a church. The device used “frequency-hopping†and would occasionally “hop†directly onto the PGXD operating frequency. This created an audible “pop†that lasted about 10 milliseconds. 2) A security system in a television studio. This device emitted bursts of RF energy in the 900 MHz band. This created re-occurring audible pops and clicks in the PGXD system. 3) A commercial phone system, made in the early 1990s, in a church. Every 15 minutes, this phone control center would emit a very strong (almost one watt!), 900 MHz band signal that queried the wireless phones: “Are you on?†“What frequency are you using?†This RF burst from the phone system produced one second of audible interference in the PGXD every 15 minutes. ********************************* Could what I am experiencing similar to the above examples, but affected 2.4 GHz devices such as cordless phone control center query, security system, or wireless power outage reporting device?

Thanks for the tips. Will definitely point antenna in V formation. The transmitters are never operated in that holder. I took that picture just for picture's sake. The transmitters are always turned on away from that holder, and off before putting back into the holder. Yes, I have this problem at another big hotel 2 years ago. Back then I only had 2 XD-V70 systems, and at least one of them popped. Jammers? It's making sense now. I didn't think regular WiFi could make the Line 6 systems pop. Unfortunately, I am uncertain if we are able to ask all the hotels to back off on the jammers, since the staff on site probably have no idea how to deactivate them properly. They do not all pop at the same time. They all pop randomly at different times. So a cross-the-board jammer is not the likely culprit. The hotel's WiFi networks are pretty strong in 3 of the channels with good separation. Then there are other signals in most of the remaining channels.

Hello, the firmware versions are as follows: System 1: MCU 1.04; FPGA 1.03; HHT12 V1.01 System 2: MCU 1.05; FPGA 1.06; HHT12 V1.01 System 3: MCU 1.04; FPGA 1.03; HHT12 V2.10 System 4: MCU 1.04; FPGA 1.03; HHT12 V1.01 System 5: MCU 1.04; FPGA 1.03; HHT12 V1.01 I should note that the system with HHT12 at V2.10 is XD-V75 transmitter in RF1 mode, and it pops the loudest. Others pop as well, but not as loud. Again, all 5 are on RF1 mode, and no other Line 6 system in the venue that I know of. Would it make any difference if I match the V2.10 HHT to the receiver with MCU 1.05 and FPGA 1.06? That way I match the newer version HHT with the newer version receiver, and leave the other 4 identical older versions. And I don't have a XD-V75 receiver, so I can't update to V2.0 firmware. Can you recommend a Line 6 rep in southeast Michigan for me to take these systems to? Thanks much!

Hello Don, thanks for the quick response. All factory capsules, all factory power plugs, as you can see in the attached images. 2 whip antennas were separated by 19" at top of the rack 4' above ground. It is at the side of the stage, so line-of-sight is not the best. I thought by putting receivers by the stage would favorably improve the distance for Line 6 systems vs. WiFi APs. Apparently not good enough. The pops happen random from multiple systems, I am not sure all 5, but sometimes the pops happen when only 1 is on, and sometimes it happens when that one is off and others are on. Sometimes it doesn't happen for 10 minutes; sometimes the same mic pops more than once a minute. The randomness makes it really hard to replicate the error to diagnose. I wasn't at a spot where I can see receiver LEDs, since I was either on stage playing, or at FOH 100 ft back. Unfortunately I am not near that venue to troubleshoot. This only happens at large hotels. I can assure it is not the mic capsules loose. When it is sitting on a stand in front of podium with keynote speaking to it, no touching at all. The capsules are all fairly tight. Power was very stable, supplied by the Middle Atlantic power distribution unit, which also powered the Shure UR system operating in 590 MHz, which was rock solid through the convention, even though its antenna did not have as good line-of-sight as the Line 6 antenna. I used smartphone scanning app Wifi Analyzer on Android. It picked up all published WiFi sources. Most of the WiFi space was occupied with fairly strong signals in most channels by the stage. Just curious, does WiFi "frame bursting" have anything to do with the pop I'm hearing on Line 6 systems? I thought in RF1 mode, the systems are supposed to "lock in", so will still operate flawlessly through interference. Is this a feature available with newer firmware? Or when the WiFi environment is so bad that all 3 or 4 carrier frequencies of a RF1 system go out simultaneously? Sounds like I am not in a game of finding enough clear channels, but forcing my way through crowded bands. If I were to add P180s, would I need the AD8 to boost the antenna, or does the XD-V70 receiver provide enough power for 2 P180s?

I just did a conference in a large hotel ballroom with 5 Line 6 XD V70 handheld systems. I also experienced numerous random loud pop sounds, once a minute or so. My receivers are placed at side of the stage, with antenna wired in daisy chained fashion properly per the manual, with terminating caps, and placed 2 original stick antennas on top of the rack pointing up. All transmitters running Mode 1, high power. Receivers all set to talk mode. The line of sight is sometimes blocked by singers' bodies, as the antenna are at the stage side just above stage floor height. Stage is 32' wide, so the furthest distance is 30 from transmitter to receiver is 30 feet. WiFi was pretty strong at the hotel, with channel most of the 12 channels were used by some sort of WiFi detectable at the stage. There were not 5 totally clear channels as far as I could see on the WiFi detector. My question is, why do I hear the pop sound? Even if it gets interfered, shouldn't the digital decoding simply silence the moment due to lack of proper signals? Does it have anything to do with firmware revision of my XD V70s? Also I am not so confident if going to P180 antenna would eliminate the problems if most of the WiFi channels are already used up.