I’m getting audio interference from my Shure PGXD 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 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.
In the examples given, there were only two solutions:
1) Replace the PGXD with a system that operates in the UHF TV band, such as the analog version of PGX; or
2) Power off (or replace) the device that caused the interference.
A simple test to determine if the problem is local interference is to operate the PGXD in a different environment, at least one mile away from the venue. If the root cause is local interference, the PGXD will work fine in a different environment. If the PGXD needs repair, it will work poorly no matter where it is used. A more accurate test is for a local wireless microphone expert to employ an RF spectrum analyzer. The analyer can display the frequency and strength of the signal causing the interference.
Sources of PGXD interference are typically nearby. When seeking the source of interference, look for devices with antennas that within 200 feet of the PGXD receiver.
From:
http://shure.custhelp.com/app/answers/detail/a_id/4126
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