AKG HT420 Band A Wireless Handheld Transmitter with D5 Dynamic Head

AKG HT420 Band A: WMS420 Handheld Transmitter with the D5 Dynamic Head

The AKG HT420 Band A is an analog UHF handheld wireless microphone transmitter from the WMS420 system, fitted with the patented D5 dynamic capsule and supplied in the Band A frequency configuration. Audio bandwidth runs 70 to 20,000 Hz with a 105 dB-A signal-to-noise ratio and 0.8 percent total harmonic distortion at 1 kHz, and one AA cell drives it for up to 8 hours. Controls are kept to what a performer actually needs on stage: a gain control on the body, a noiseless on / off / mute switch and a battery status indicator, with charging contacts underneath for the optional CU400 charging unit. Its companion is the SR420 stationary receiver, ordered separately, and as many as eight systems can share one frequency band. It is the handheld most often bought to keep a working WMS420 system in service.

The D5 Supercardioid Dynamic Head and Why It Suits a Handheld

Screwed into this transmitter is AKG's patented D5 dynamic capsule, a supercardioid vocal head, and both of those descriptions matter for different reasons. Dynamic means the capsule generates its signal from a coil moving in a magnetic field, so it needs no polarising voltage, shrugs off humidity and temperature swings, and tolerates being gripped hard, passed between speakers and set down heavily on a lectern; supercardioid means the pickup is narrower than a cardioid and its deepest rejection falls at the rear sides, roughly where floor monitors and side fills normally sit, which lifts the gain a system can reach before it rings. Worth flagging because it is printed incorrectly in places: this head is supercardioid rather than cardioid, and treating it as cardioid will lead a monitor engineer to aim the nulls in the wrong direction. A worship reader, a school choir soloist or a roaming presenter all benefit from the same combination of durability and feedback rejection.

Band A, and Confirming the Carrier Range Before You Coordinate

Band A on this transmitter covers 530.025 to 559.000 MHz, the carrier range AKG publishes in the per-band frequency table on its SR420 receiver page, and a Band U2 version of the same handheld is offered alongside it. A carrier range is simply the slice of UHF spectrum the radio link can be tuned across, and a channel plan is built inside it: transmitter and receiver must be set to the same frequency, and that frequency has to sit clear of local television carriers and of any other wireless already working in the room. Close to 29 MHz of span is what makes up to eight simultaneous WMS420 channels possible, since each channel needs separation from its neighbours to keep intermodulation products from landing on a working frequency. The band designation is also printed on the transmitter body and on its matching receiver, so a technician adding this handheld to an installed rack can read both labels and confirm they agree before touching the channel plan. Anyone deploying in the United States should still check the range against current spectrum rules, because post-repack reallocation restricts operation in parts of the former UHF range and 530 to 559 MHz sits in a region where local coordination continues to matter.

Eight Channels Per Band and Manual Channel Scanning

Support for up to eight simultaneous channels within a single band is what makes the WMS420 platform useful beyond a single microphone, and the receiver finds those channels by manual scanning rather than by an automated setup routine. Scanning means the receiver listens across its available channels and reports which ones are clear, and the operator then sets the transmitter to match, which is slower than an infrared handshake but entirely predictable and needs no special training to perform. Eight channels comfortably covers a worship team with several roving microphones, a school production with a handful of principals, or a conference floor with a panel and two lecterns. Because the same band must be shared, the practical discipline is to scan the room when it is populated rather than empty, since an audience full of phones changes what is clear.

Power, Runtime and Charging Without Opening the Case

Running from a single AA cell, either an LR6 alkaline or an HR6 NiMH rechargeable, the transmitter delivers up to 8 hours, which covers a service, a lecture block or an evening performance with margin. Charging contacts on the body then allow a rechargeable cell to be refilled in the optional CU400 charging unit without the battery compartment ever being opened, and that detail is worth more than it appears on a fleet of handhelds, because a door opened twice a day wears its catch, admits moisture and offers a reliable way to lose a cell into the dark at the back of a stage. A battery status indicator on the transmitter warns before the cell is exhausted, so a technician gets notice rather than silence mid-sentence. For a church with two Sunday services or a school with back-to-back assemblies, that combination turns battery management into a routine instead of a gamble.

Working Range, System Fit and Who Buys This Handheld

Radiating from an antenna integrated into the transmitter body, the handheld works to around 98 ft (30 m) depending on the receiving antenna system, and having no external whip means nothing to snag on a strap or snap off inside a flight case. Pairing is with the SR420 stationary receiver, ordered separately, so almost everyone buying this part number already owns the receiver and is replacing a damaged handheld, adding a channel, or building a spare into an inventory; matching the band designation on the transmitter to the band of that installed receiver is therefore the single most important check at the point of order. Deployments follow the platform's character rather than its headline specification: houses of worship with a fixed installed receiver and handhelds for readers and announcements, school and college auditoriums, community theatres, council chambers and lecterns, mobile presenter and training rigs that travel between rooms, and rental stock kept for installed systems. Owners describe it as an unglamorous, dependable handheld, which is exactly the role a replacement transmitter is bought to fill.