Item # 502798 | Customer Ratings: ( 3 Based on 2 reviews)

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Nady UHF-4 LT/HM-20U (115) Headset Wireless System
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Advanced features, low price for a wireless uni-directional dynamic headset system.

This Nady UHF-4/HM-20U headset wireless microphone system offers high-quality wireless performance for an amazingly affordable price. It gives you interference-free operation on select UHF frequencies, companding circuitry for an exceptional 120dB dynamic range, and clear, natural sound. The DigiTRU Diversity dual-antenna system prevents dropouts and extends its range. The Tone Squelch function blocks potential interference while full LED indicators keep you on top of things. The UHF-4 also features unbalanced 1/4", unbalanced XLR outputs, and silent transmitter on/off.

The wireless mic system includes receiver, bodypack transmitter, and HM-20U mic headset. The Nady Transmitter features status and low-battery indication and an off/standby/on switch. A 9V alkaline or NiMH battery provides 4-6 hours of continuous usage.

Nady HM-20U Headset Mic
The Nady HM-20U is a miniature unidirectional condenser headset microphone. Optimally designed for singing and speaking applications, even in noisy environments. The mic's small, lightweight design makes it ideal for handsfree use with minimum visibility. It's perfect for singer-musicians (drummers, keyboardists), vocal/dance performers, DJ's, television announcers, public speakers, and aerobics instructors.

The headset's arch-shaped rests are placed over each ear and the remainder of the band extends around the back of the head just above the neck. The tip of the supporting arches rests on the temple just in front of the ear providing the necessary stability during use. The mic boom descends from the ear on the left side.

Carefully loosen the boom by unscrewing the assembly one-quarter turn. Place the microphone capsule close to the mouth to a favorable audio position. Tighten the boom assembly. Bend the boom and headset slightly for optimum fit. Connect the Mini-XLR or 3.5mm phono plug of the microphone cable to the input jack of the bodypack transmitter or XM-10 phantom power adapter. When using a phantom power adapter, connect it to the microphone input of an audio preamp that provides phantom power.

The entire Nady HM-20U microphone assembly has been moisture-proofed to guard against deterioration during use.

Nady UHF-4 LT/HM-20U (115) Headset Wireless System Features:

  • UHF-4 LT wireless mic system
    Interference-free operation on select UHF frequencies within separate bands 902-928 and 944-952MHz

    Half-rack design receiver design with folding front panel dual antennas
    Snap out panel locking tabs for sing/and dual receiver optional rackmounting
    Tone Squelch to lock out interference
    DIgiTRU Diversity technology
    Full LED indicators
    unbalanced and balanced output
    Noisless transmitter On/Off switching

    UB-4 bodypack transmitter
    3 mic operating modes: Instrument (GT), Headworn(HM), and Lavalier (LT) mic
    Off/Standby/On switch
    Locking 3.5mm mini-jack
    Accessible input level adjust control
    Easily accessible input level adjust controller
    Runs on single 9V alkaline or NiMH battery

    HM-20U headset mic
    Full-frequency, uni-directional electret condenser mic
    Warm, transparent audio and maximum feedback rejection
    Durable, thin metal frame easily molded to any user
    Ergonomic design and comfortable fit with or without glasses, hat, or headphones (also no hairstyle hindrance)
    Tiny 5mm x 8mm lightweight capsule for hours of comfortable use
    Two sizes of foam windscreen included to reduce wind/popping noise
    Extendable, fully adjustable boom for optimum mic capsule placement
    Comes with standard XLR adapter for all wired and wireless applications

Nady UHF-4 LT/HM-20U (115) Headset Wireless System Specifications:

  • System
    Frequency response: 30Hz - 18KHz, +/- 3dB
    Dynamic range: 120dB
    THD: < 0.6%
    RF carrier frequency range: UHF, choice of single frequencies in separate bands within 794-865MHz
    Frequency stability: +/- 0.005%, crystal controlled
    Modulation: FM (F3E), +/- 20KHz normal
    Operating Range: Up to 250 ft. typical (depending on site conditions); up to 500+ feet optimum line-of-sight

    Reception Mode: DigiTRU Diversity (Dual Antenna)
    Squelch: External Control, Tone Key (30.768 KHz)
    Controls: Power On/Off, Volume Control, Squelch (Mute) Adjust
    Connectors: DC in, 1/4 in. unbalanced phone jack (360 mV/ no load), XLR balanced input (+/- 24 mV/ 600 Ohm load)
    LED indicators: Power On, Diversity A/B, Audio LED Bars + Peak
    Unwanted signal rejection: 60 dB image and spurious
    Power requirements: DC 15V @ 300 mA, adapter included
    Dimensions: 1.75"H x 7.5"W x 8.1"D (4.5 x 19 x 20.6 cm)
    Weight: 0.9lb. (.41kg)
    Antenna: 3.5", dual telescopic

    Element: Back electret condenser
    Polar pattern: Uni-directional cardioid
    Frequency Response: 20Hz~20KHz
    Sensitivity: -46dB ±3dB
    Output impedance:1KΩ ±5%
    SPL max: 135dB
    Power supply: 1.5-12V DC
    Capsule: 5mm x 8mm
    Cable: 1.5mm diameter, 1M(40")
    Weight: 0.6oz.(18g)
    Output connector: 3.5mm mini-locking plug or 3-pin mini-XLR
    Mini-XLR Wiring: GND = Pin 1, Hot (+) = Pin 3 --> 2KΩ --
    > Pin 2
    3.5mm Plug Wiring: GND = Sleeve, Hot (+) = Tip Foam

Nady UHF-4 LT/HM-20U (115) Headset Wireless System

Wireless Equipment (Most) *1 Year
DKW-Duo, DKW-3 *90 Day
Pro-Audio (Most *1 Year
SPC-4C, ProPerformer microphones *90 Day
RSM-1,2,3,4,& 5 *1 Year
TRM-6 *1 Year
Speakers/Powered Speakers *1 Year
Headphones *1 Year
Power Amps *1 Year
Products identified as a "Blem" or "Refurb" carry a 90-day warranty.

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Pro Coverage includes:

  • Accidental damage protection (new gear only)
  • Expedited Repair
  • Free Shipping (for returns or repairs)
  • 100% Coverage for Commercial Use
  • Extended Return Period
  • Extended Price Protection
  • No Lemon Guarantee
  • Free Transfer of Coverage to a new owner
  • Repair Costs Covered for up to 3 years from date of purchase
  • Repairs Can Be Authorized Toll-Free by Phone or the via the web
Product Reviews
(Based on 2 reviews)
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  • Great sound, no dropouts!

    As reviewed by Paul on 6/24/2010

    I was impressed by the quality of the sound immediately. Clean & clear vocals. The receiver and transmitter are straightforward & easy to use. By freeing myself from the mic stand, I was able to perform & interact with the audience much more than I ever have before! Our last performance was a great success thanks to my wireless headset mic! If you play guitar or bass while fronting a band, ya gotta getcha one of these!

    34 of 34 people found this review helpful.
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  • Bad info in description

    As reviewed by troy on 6/11/2015

    The HM-20U headset lists as "optional equipment" the XM-10 mini XLR phantom power adapter for "wired application". So from that, I expected it to work with the XM-10 for situations where I want to plug into a board and use the headset mic phantom powered. But it turns out the unit is EITHER a mini XLR (in which case the optional XM-10 will work with it, and allow for "wired application") OR a 3.5mm phono plug (in which case the XM-10 will NOT work with the headset, and you are out of luck if you ever want to use this headset for a wired application.) So the description is wrong. This unit is not adaptable for wired, phantom powered application. Then I went looking for the Mini XLR version of this product, which we can infer must exist from the description issue above, and it doesn't appear to exist. Looks like Nady changed from mini xlr to phono, losing the capability of running these headsets wired, and forgot to update their description. Another lapse by Nady: The description claims the headset is uni-directional. The box says Omni. Fail.

    0 of 0 people found this review helpful.
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Questions about the UHF-4 LT/HM-20U (115) Headset Wireless System (502798)

PO Box 4769
Westlake Village, CA 91359
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