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  • Regular price $100.00
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The CRTX2 is a rectangular variation of our CRTX1 Audio Surveillance Transmitter. This UHF live audio transmitter is pushing 10mW and is meant for close-range monitoring. 

This difference will not negatively impact the performance of this transmitter, the range will only be subdued by a minimal amount. If you require an audio surveillance transmitter that will be situated in a target location that is not abundant in obstacles, this is the transmitter for you. If you are expecting obstacles such as structures (man-made/natural) then the 20mW CTX2 is a better fit.

  • Measuring only 25mm X 15mm with a thickness of .8mm.
  • This Transmitter comes mounted with a button cell battery holder for a CR2032 battery (CR2032 will provide 25-30 hours of audio surveillance) 
  • No switches or indicator lights.
  • For custom power options for extended operating time, please contact us.

This is a permanent, always-on "hot-microphone", once the battery is inserted the CRTX2 will begin live transmission of ambient and surrounding audio without interruption on the Ultra High-Frequency band. The CRTX2 will broadcast audio over a distance of 100-300 metres in a cluttered urban environment, up to 500 metres with LOS, through concrete, drywall, and thick bush to any UHF receiver, it operates on a single button cell battery.

Use this transmitter to remotely listen to an area of interest that requires discrete acoustic monitoring. We recommend any handheld VHF/UHF/SDR receiver capable of tuning into the VHF/UHF range, this is a standard range in most receivers. Our recommended handheld receiver is the Baofeng UV-5R or the AnyTone AT-318UV. Your CRTX2 will arrive with its specific Tx/Rx frequency noted on its back.

Power Supply Options

1x CR2032 (3v) : 25-30 Hours Of Continuous Operation.

Dimensions 15mm x 28mm x .8mm

100Hz ~ 20kHz Panasonic: Analog Microphone Electret Condenser. Directional Characteristic: Omni-Directional
Sensitivity: -7.0 ±4 (0 dB = fs/Pa@1kHz).
Signal to Noise Ratio: 78 dB Typ. at 1kHz.
Max Input Sound Level: 101 dB SPL Typ.

Weight Without Battery: 8g
Output (RF) power  10mW
Antenna 60mm OR 110mm: .5mm NiTinol.
Frequency Range

VHF/UHF/136-174MHz/433-434 MHz, 2.5 kHz step.

Effective Range 15m From Centre. 
Stability  Highly Stable. Crystal Referenced Phase-Locked Loop.
Crystal 00k/ASK Data Transmitter.

In order to maintain its longevity, the CRTX2 is potted with a compound or wrapped in a heat-shrink sleeve that seals all onboard components, only the microphone and the battery terminal are accessible and made visible.

HAVE A NON-TRADITIONAL AUDIO SURVEILLANCE APPLICATION? We can design for your needs. TINYTX has designed and manufactured hidden and covertly disguised audio surveillance transmitters for several client projects and applications. Contact us for turnkey solutions.

 (PCB REV 3.0)