TNR-3000 Noise Reduction Unit

TNR-3000 Noise Reduction Unit

Telonics TNR-3000 Noise Reduction Unit is small, rugged, and lightweight; and is suitable for operation in vehicles or at fixed sites.

Users can power the TNR-3000 with either an internal 9 volt battery, a car power jack, or an AC power source, depending on application requirements. Telonics supplies the appropriate cables and transformers separately.

Key Features

  • Reduces background noise from telemetry receivers by 15-17dB
  • Reduces impulse noise from vehicle engines, steady-state tones such as whines and whistles, and heterodynes present in many telemetry receivers without reducing the level of the desired telemetry pulses
  • LED low battery/power check indicator
  • Internal speaker for receiver function verification; but monitoring should be through quality headphones
  • Powered by internal 9-V battery, 110-240V AC power cord (PS009736-001) or 12 VDC power cord (PS007248-001); all available separately



Internal power supply9 V alkaline battery
External voltage9 - 28 Vdc
External power source, minimum current capacity150 mA continous @ 12 Vdc
Audio amplifier output power, maximum250 mW into 8 ohms at 1 KHz
Frequency response240 - 2000 Hz (3 dB bandwidth)
210 - 2750 Hz (6 dB bandwidth)


Current55 mA typical
Noise reduction, typical15 - 17 dB
Minimum noise reduction, continuous tone, heterodynes40 dB
Minimum noise reduction, pulse tone, auto ignition20 dB @ 100 Hz
Maximum input signal for optimum noise reduction3 Vpp


Size1.4 x 2.8 x 4.5 in
3.5 x 7.1 x 11.4 cm
Weight7 ounces
200 g
Case constructionMolded thermoplastic with integral battery compartment
Front panel audio input1/4 inch monaural phone jack
Front panel audio output1/4 inch stereo phone jack
Power jackStandard 2.1 mm coaxial power jack, center pin positive
I.D. 2.1 mm, O.D. 5.5 mm, insertion length 12 mm
Power switchOn/Off toggle
Internal speaker8 ohm internal speaker

Related Products


Service Commitment

Since 1970, Telonics has built a reputation based on product quality, product support, service, and customer satisfaction. Telonics strives to produce the highest quality products, and to support those products accordingly.

Because of extreme conditions and the unpredictable nature associated with most telemetry applications, problems occasionally arise. Most problems can be resolved quickly. In all cases, we hope to be able to work in partnership with users to resolve problems to the user's satisfaction and to uphold our demonstrated commitment to excellence. If problems should arise, all products must be returned to our factory for failure analysis.


Telonics warrants its products to be free from defects in material and workmanship for a period of one year from the date acquired. Telonics does not warrant batteries.

If a defect occurs, return the equipment to us within the proper time frame at the following address: TELONICS, 932 E. IMPALA AVENUE, MESA AZ USA 85204-6699. Damage to any equipment resulting from misuse, accidents, unauthorized service, extreme conditions, or other causes, is excluded from this warranty. Telonics does not assume responsibility for loss or damage to equipment during shipment. Telonics does not assume responsibility for delays resulting from shipment on commercial or private carriers. We insure all equipment shipped from our facility and suggest that shipments to Telonics also be insured.

Upon the timely return to our facility, if defective, the product will be replaced or repaired at our discretion at no cost to the customer. This remedy is the exclusive remedy. This product is supplied without any further warranties or conditions, expressed or implied, including warranties of merchantability, quality or fitness for particular reason or those arising by laws, statutes or trade usage or course of dealing.

The entire risk, as to the results and performance of the product, is assumed by the customer. Neither Telonics, nor its suppliers, shall have any liability to the customer or any other person or entity for any indirect, incidental, special, or consequential damage whatsoever, regardless whether Telonics has been told of the possibility of such damages or that such damages might be foreseeable. Telonics has no responsibility or liability for the claims of any third party. The maximum aggregate to the customer, of Telonics and its suppliers, shall not exceed the amount paid by the customer for the product.