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.<\/p>\n
Here are examples of devices that are known to interfere with the PGXD:<\/p>\n
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.<\/p>\n
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.<\/p>\n
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.<\/p>\n
In the examples given, there were only two solutions:<\/p>\n
1) Replace the PGXD with a system that operates in the UHF TV band, such as the analog version of PGX; or<\/p>\n
2) Power off (or replace) the device that caused the interference. <\/p>\n
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.<\/p>\n
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.<\/p>\n
From:
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