Williams Sound Compact base Station Transmitter 72-76 MHz

The Williams Sound PPA T27 Personal PA Compact FM Transmitter provides wireless audio coverage over the 72-76 MHz band. Its nominal range extends up to 1,000 feet (305 meters) when used with the standard ANT 021 rubber-duckie antenna or optional ANT 005 coaxial antenna. Seventeen selectable channels, microphone and line-level inputs, and multiple compatible antenna connections support a range of personal listening installations.

Ideal Use Cases

The PPA T27 is designed for applications in which audience participants listen through FM receivers operating within the 72-76 MHz frequency range. Its combination of compact dimensions and broad nominal coverage makes it suitable for fixed or portable personal PA deployments. The transmitter accepts either a microphone-level source through its 3.5 mm input or a line-level source through its RCA input, allowing it to work with different audio feeds without requiring the same connection type for every installation.

Why Choose This Model

Seventeen operating channels provide flexibility within the supported frequency band. Channel selection is handled through external switches that can be locked, helping preserve the selected configuration after setup. The available frequencies range from 72.1 MHz through 75.9 MHz and include designated channels A through T. Any compatible FM receiver operating on the selected 72-76 MHz frequency can receive the broadcast audio.

The PPA T27 also provides dedicated control over incoming signal level. Its screwdriver-adjustable input attenuator can be set for the connected source, while nominal input ranges of 1-10 mV for microphones and 0.1-1 Vrms for line-level equipment accommodate two common audio signal types.

Installation and Integration

Installation begins by connecting an audio source to the appropriate input. The 3.5 mm mini phone jack supplies DC power for compatible electret microphones, while the high-impedance, unbalanced RCA jack accepts line-level audio. The input attenuator provides a hardware adjustment for matching the connected source.

Antenna connectivity supports several configurations. The thread mount accepts an ANT 021 rubber-duckie antenna or ANT 025 telescoping antenna. An RF connector supports an ANT 024 dipole or ANT 005 coaxial antenna. The selected receiver and transmitter frequencies must correspond within the supported 72-76 MHz range. For U.S. and Canadian power, the transmitter operates from 105-130 VAC at 50-60 Hz and consumes 3.2 watts at 120 VAC.

Performance Highlights

The transmitter uses wide-band FM modulation with a maximum deviation of 75 kHz. Its specified frequency response is 85 Hz to 14 kHz within ±3 dB, with maximum total harmonic distortion of 1%. Signal-to-noise ratio is rated at 65 dB when used with an R35 receiver. Frequency stability is ±0.005% over 0-50°C, and pre-emphasis is 75 µS.

Nominal transmission range reaches up to 1,000 feet (305 meters) with the stated antenna configurations. RF field strength does not exceed 80 mV/m at three meters. The transmitter carries FCC approval, including Part 15, along with Industry Canada, RoHS, and WEEE approvals.

What Makes It Different

The PPA T27 brings its transmitter functions into a chassis measuring 4.1 inches wide by 6.1 inches long by 1.3 inches high. It weighs 7.8 ounces and has a black finish. Despite that compact format, it includes 17 lockable channel selections, separate microphone and line-level connections, an adjustable input attenuator, and support for four specified antenna models.

This combination lets one transmitter interface with electret microphones, line-level sources, and compatible 72-76 MHz receivers while offering antenna choices for different integration requirements.

Final Assessment

The Williams Sound PPA T27 is a compact 72-76 MHz FM transmitter built around flexible source connectivity and selectable-channel operation. Its 17 lockable channels, nominal range of up to 1,000 feet, microphone and RCA inputs, and multiple antenna connection options make its capabilities clearly defined for compatible Personal PA listening systems. A Lifetime PLUS Limited Warranty applies, with 90-day coverage stated for most accessories.