Product Overview

The Williams AV PPA T27 is a compact FM assistive listening transmitter that broadcasts a presenter’s voice, music program, or other audio source up to 1,000 feet to listeners using R37, R38, or any FM receiver operating on the 72-76 MHz hearing assistance band. With a 3.5 mm microphone input and an RCA line-level input for sound system feeds, the T27 is the core of a large-area FM assistive listening system for houses of worship, auditoriums, and government meeting spaces working toward ADA compliance.

Product Description

Setup is straightforward for integrators and facilities staff alike: connect an electret microphone with a 3.5 mm plug for direct voice pickup, or feed program audio from the house mixer into the high-impedance, unbalanced RCA line input. A screwdriver-adjustable input attenuator sets level, and a high-contrast LED display with push-button frequency selection steps through all 17 wideband channels. Holding both frequency buttons for three seconds locks the channel, preventing accidental changes after commissioning.

The T27 is microprocessor-controlled and frequency-synthesized for 0.005% stability, transmitting wideband FM at the maximum field strength allowed by FCC rules for a nominal range of up to 1,000 feet with the included ANT 021 rubber-duckie antenna. A 75-ohm F-connector antenna output supports the optional ANT 005 coaxial or ANT 024 dipole antenna for remote antenna placement in rack installations or RF-challenged rooms. The transmitter carries FCC Part 15 certification under the post-2016 auditory assistance emissions mandate.

Pair the T27 with PPA R37 FM receivers to complete the system, or see pre-configured options like the PPA VP 37 value pack in the Williams AV collection at Creation Networks.

Key Features

• 1,000-Foot Operating Range The transmitter covers up to 1,000 feet (305 m) with the included ANT 021 antenna, serving large venues from a single unit.
• 17 Selectable Wideband Channels Push-button frequency selection across the 72-76 MHz hearing assistance band allows multiple systems to coexist on one campus.
• Mic and Line-Level Inputs A 3.5 mm electret microphone jack and RCA line-level input accept either direct voice pickup or a feed from the house sound system.
• Channel Lock Holding both frequency buttons for three seconds locks the selected channel so settings survive after commissioning.
• High-Contrast LED Display The front-panel display shows the active frequency for quick verification by operators and AV techs.
• Remote Antenna Options A 75-ohm F-connector output supports the optional ANT 005 coaxial antenna for installed systems requiring remote antenna placement.
• FCC Part 15 Certified The T27 holds a Grant of Certification under the FCC’s 2016 emissions mandate for 72-76 MHz auditory assistance transmitters.
• Lifetime PLUS Limited Warranty The transmitter is backed by Williams AV’s Lifetime PLUS Limited Warranty, with 90 days on accessories.

Typical Applications

• House of worship
• Auditorium
• Government space
• Commercial meeting space
• Training room
• Multi-purpose room

Technical Specifications

Frequently Asked Questions

Which receivers work with the PPA T27?

The T27 is compatible with Williams Sound R37 and R38 receivers, and with any FM receiver operating on the 72-76 MHz hearing assistance band. Receivers are sold separately or in pre-packaged bundles.

Can I feed the T27 from my existing sound system?

Yes. The rear-panel RCA line-level input accepts a high-impedance, unbalanced mono feed from a mixer or DSP output, with a screwdriver-adjustable attenuator to match levels from 0.1 to 1 Vrms nominal.

How do I extend or relocate the antenna for an installed system?

In addition to the included ANT 021 rubber-duckie antenna, the T27 provides a 75-ohm F-connector for the optional ANT 005 coaxial antenna or ANT 024 dipole. The FCC requires the ANT 021 remote installation to be professionally performed, making this a standard task for an AV integrator.

Does the T27 help meet ADA requirements?

The T27 transmits on the 72-76 MHz frequencies reserved for hearing assistance and, paired with neckloop-compatible R37 receivers, forms a large-area assistive listening system consistent with 2010 ADA guidelines for assembly spaces.

Can the T27 be used internationally?

The transmitter is FCC approved for U.S. markets and is supplied with a 110 V US power supply only. The 72-76 MHz band is not authorized in all countries, so verify local radio regulations before deploying abroad.

What warranty applies?

The PPA T27 carries the Williams AV Lifetime PLUS Limited Warranty, with 90 days on most accessories. Creation Networks supports system design and product selection for commercial assistive listening deployments.