Heil Sound PR 781 Dynamic Cardioid Amateur Radio Microphone Black XLR

Heil Sound PR 781 Black: Broadcast-Grade Amateur Radio Microphone

The Heil Sound PR 781 is a professional-quality dynamic cardioid microphone engineered specifically for amateur radio operation. A dynamic microphone generates its signal with a moving coil rather than a powered capsule, giving the PR 781 the ruggedness and clean output prized by serious operators. Hams choose the PR 781 because it brings genuine broadcast articulation to the ham shack, helping transmissions cut through and sound noticeably fuller on the air.

Heil PR Broadcast Element in the Shack

At the core of the PR 781 is a large-diaphragm Heil PR dynamic element, the same class of element Heil builds for professional broadcasting. Borrowing a broadcast capsule gives the microphone a wide, refined response and the signature speech articulation that studio talent relies on. For an operator chasing DX or working a pileup, that articulate midrange translates into intelligible audio that stands out even under weak-signal conditions.

Frequency Response Tuned for Speech

The PR 781 delivers a 50 Hz to 16 kHz frequency response, a range deliberately wider than most amateur-radio microphones yet narrower than a full studio mic. Frequency response defines the band of pitches the microphone reproduces, and this carefully chosen window balances fullness against on-air intelligibility. The result is clear, natural speech with enough body to sound authoritative and enough focus to punch through the noise on a crowded band.

Cardioid Pattern Rejects Shack Noise

This microphone uses a cardioid polar pattern that concentrates pickup on the front of the capsule while rejecting sound from the sides and rear. Cardioid response is what keeps computer fans, keyboard clicks, and room reflections out of your transmitted audio. In a busy operating position surrounded by equipment, that directional focus helps deliver clean, professional-sounding transmissions without picking up the whole room.

Low-Mass Aluminum Diaphragm

The PR 781 is built around a low-mass aluminum diaphragm that moves quickly in response to the voice. A lighter diaphragm tracks transients faster, capturing consonants and detail with crisp accuracy for highly intelligible speech. Operators report consistently strong audio reports precisely because this responsive diaphragm renders the voice clearly across a range of transceivers.

Balanced XLR Output and Radio Compatibility

The PR 781 provides a 600 ohm balanced output on a 3-pin XLR connector, the professional standard for clean, interference-resistant audio. To connect it to a specific transceiver you use the correct Heil CC-1-XLR cable, which adapts the balanced XLR output to your radio's microphone input. Consulting the Heil Product Compatibility Guide confirms which cable matches models from the major transceiver manufacturers, ensuring a proper connection.

Passive Operation, Black Finish, and Included Clip

As a passive dynamic microphone, the PR 781 needs no phantom power and is ready to transmit as soon as it is cabled to the rig. This version wears a black satin finish with a black grille and ships with a microphone clip for mounting at the operating desk. For SSB operators, contesters, and rag-chewers who want their signal to sound its best, the PR 781 is a purpose-built upgrade for the shack.