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Lectrosonics HM Digital UHF Wireless Plug-On Microphone Transmitter (Freq Block 22)

B&H # LEHM22Q MFR # HM-22
In Stock
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You Pay: $1,075.00
Product Highlights
  • Frequency Block 22
  • Digital Hybrid Wireless Technology
  • Membrane-Switch Controls w/ LCD Display
  • Converts XLR Mic Signals to UHF Wireless
  • Phantom Power: 5, 18, and 48 Volts
  • Adjustable Low Frequency Roll-Off
  • 256 Synthesized UHF Frequencies
  • 100 mW Output Power
  • Rugged, Machined Aluminum Housing
  • Powered by Two AA Batteries

The HM Digital UHF Wireless Plug-On Microphone Transmitter from Lectrosonics enables you to transmit the signal of any XLR microphone wirelessly. The HM transmitter overcomes inherent channel noise with its patented Digital Hybrid Wireless technology, which digitally encodes the audio. Digital conversion before transmission provides all of the benefits of conventional FM wireless systems, (range, resistance to interference, etc) without the noisy artifacts introduced by analog compandors.

The HM transmitter provides 256 user-selectable UHF frequencies. The input amplifier uses an ultra low noise op-amp for quiet operation. Gain controlled with a wide range dual envelope limiter, it provides over 30 dB of headroom above full modulation. A 24-bit A-D converter digitizes the audio, then filters supersonic noise above 21 kHz.

HM transmitters are backwards compatible with Lectrosonics 100, 200, and IFB series receivers; as well as being compatible with third-party analog receivers. Phantom power from its XLR input jack is selectable between 5, 18 and 48 volts, making the HM compatible with just about any condenser or dynamic microphone. It's powered by two AA lithium, NiMH, or alkaline batteries for up to 12.75 hours of use, with Phantom Power engaged (lithium).

The sound quality of the HM transmitter is outstanding. The power supply provides constant voltages, switching to accommodate the life-cycle of the batteries, resulting in an ultra low noise input amplifier. The excellent signal to noise ratio and dynamic range of the HM qualify it for use in the most demanding of professional applications.

Wideband Design
The HM transmitter uses ±75 kHz wide deviation for an excellent signal to noise ratio and wide dynamic range.
Digital Hybrid Wireless Technology
Audio is encoded in the transmitter and decoded in the receiver, overcoming channel noise, yet still sending the encoded information via an analog FM wireless link.
Low Frequency Roll-Off
The low frequency roll-off can be set for a 3 dB down point at 35, 50 or 70 Hz to control low frequency rumble and ambient noise in the audio.
Input Limiter
A DSP-controlled limiter is employed before the analog-to-digital converter. The limiter has a range of more than 30 dB for excellent overload protection. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion.
Battery Powered
The HM transmitter is powered by two AA batteries, yet still maintains long battery life, even with 48V Phantom Power engaged; up to 12.75 hours with Lithium batteries.
Frequency Selection 256 frequencies in 100 kHz steps
Operating Frequency 563.200 - 588.700 MHz
RF Power Output 100 mW (nominal)
Pilot Tone 25 to 32 kHz; 5 kHz deviation (in the 400 Series operating mode)
Frequency Stability ± 0.002%
Deviation ± 75 kHz (max)
Spurious Emission 60 dB below carrier
Equivalent Input Noise -125 dBV (A-weighted)
Input Level Nominal 2 mV to 300 mV, before limiting; greater than 1V maximum, with limiting
Input Impedance 300 Ohms
Limiter Dual envelope "soft" limiter; greater than 30 dB range
Gain Range 55 dB; panel mounted membrane switches
Modulation Dual bi-color LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation
Frequency Response 35 Hz to 20 kHz (+/-1dB)
Low Frequency Roll-Off Adjustable for -3 dB @ 30, 50, 70 Hz
THD 0.2% (typ. 100 Hz to 20 kHz)
Signal to Noise Ratio SmartNR Off
  • no limiting: 103.5 dB
  • limiting: 108 dB

SmartNR Normal
  • no limiting: 107 dB
  • limiting: 111.5 dB

SmartNR Full
  • no limiting: 108.5 dB
  • limiting: 113 dB
Dynamic Range 125 dB (with full Tx limiting)
Controls and Indicators
  • Power/Phantom "ON-OFF" switch
  • Phantom voltage selector switch
  • Audio input gain knob
  • LCD w/membrane switches
  • LED audio level indicators
Audio Input Jack Standard 3-pin XLR (female)
Phantom Power Off; 5V @ 18 mA max; 15V @ 15 mA max; 48V @ 4 mA max
Antenna Housing and attached microphone form the antenna
Battery Two 1.5 Volt AA lithium or rechargeable NiMH recommended
Battery Life Alkaline
  • No Phantom: 5 hrs
  • 48V on: 3.5 hrs

NiMH 2500
  • No Phantom: 9.25 hrs
  • 48V on: 7 hrs

  • No Phantom: 16 hrs
  • 48V on: 12.75 hrs
Emission Standard 180KF3E
Dimensions 4.25 x 1.62 x 1.38" (10.8 x 4.1 x 3.5 cm)
Weight 6.7 oz (190 g) without batteries
Lectrosonics HM Digital UHF Wireless Plug-On Microphone Transmitter (Freq Block 22)
  • 1-Year Limited Warranty
  • Batteries & Power

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    Required item: Batteries (not included) are required to power this device.

    Duracell -  AA 1.5v Alkaline Coppertop Battery (4-Pack)
    • You Pay: $2.79
    Watson -  4-Hour Rapid Charger with 4 AA NiMH Rechargeable Batteries (2300mAh)
    • You Pay: $17.95


    Lectrosonics -  MCA-TPower - 48V Phantom to T-Power Converter
    • You Pay: $59.95
    Usually ships in 2-4 weeks i This is a Special order item. Est. arrival at B&H is 2-4 weeks (subject to availability). Your order will be charged at time of shipment. Item is non-cancelable and non-returnable.


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    Polsen -  HDR-10 Omnidirectional Handheld Dynamic ENG Microphone
    • You Pay: $69.99
    Senal -  ENG-18R Broadcast Omnidirectional Dynamic Microphone
    • You Pay: $89.00

    Additional Hardware

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    Lectrosonics -  21750 XLR Polarity Reverse Barrel Adapter
    • You Pay: $27.35
    Usually ships in 7-14 business days i This is a Special order item. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at time of shipment. Item is non-cancelable and non-returnable.

    Cases & Protection

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    Lectrosonics -  PHTRAN3 Leather Pouch
    • You Pay: $13.95
    Lectrosonics -  PHTRAN2 Cordura Pouch
    • You Pay: $22.95
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