Reports, recordings and identification of devices operating primarily on 26.995 MHz, 27.045 MHz, 27.095 MHz, 27.145 MHz, 27.195 MHz and 27.255 MHz with a little bit of Part 15 & 95 operations thrown in. If you have photos of equipment and installations, please post them to this group!
As per Code of Federal Regulations, Title 47, Volume 5, Sec. 95.210, devices on the following frequencies:
26.995-27.195 MHz may operate up to 4 Watts,
27.255 MHz may operate up to 25 Watts.
27.255 MHz is where many exciting transmissions are due to the higher power allowed! Most every city in the US will have something operating on 27.255 MHz! Some examples are car alarms, irrigation controllers, various remote indication devices, restaurant paging systems and even city-wide voice paging systems.
Unique devices are not limited to these frequencies, the item pictured on our homepage is a voice paging transmitter used in an office building in the mid-80's. It operates on 27.405 MHz, CB Radio channel 40.
Another exciting frequency range is centered on 27.120 MHz where radio-frequency heating, welding and ion sputtering devices operate. Many different modulation schemes are used depending upon the requirements of the project. Although devices centered on 27.120 MHz are required to be shielded for safe operation, some operate with outputs of many tens of thousands of Watts and are very poorly shielded and maintained. You're bound to hear something!
If you hear something, make a recording, preferably in .WAV format and post your message here. Users can create folders in which to place recordings, descriptive texts and photographs of devices they've identified or wish to have identified.
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