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  • Regular price $280.00
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The CTX3 is our smallest transmitter to date.

And likely the smallest UHF Audio Surveillance Transmitter in the world, measuring only 6.39mm x 18.56mm with a thickness of .8mm. the CTX3 comes with batteries mounted for you which will provide upwards of 12 hours of continuous audio surveillance, you only need to solder one wire to activate the transmitter, alternatively, this transmitter comes as a standalone device with the (+) / (-) terminal pads tinned for you to attach your own power/battery supply (3v-3.7v), opening the door to limitless operational time.

  • This Transmitter allows you to attach any power/battery option suited for your needs (≤ 3.7 Volts). The CTX3 has +/- solderable power/battery input terminals for you to attach custom power supply packs, enabling you to dramatically extend your transmitters surveillance operation time using any Li-Ion power option or any custom battery pack. 
  • No switches or indicator lights.

This is a permanent, always-on "hot-microphone", once the battery is inserted the CTX3 will begin live transmission of ambient and surrounding audio without interruption on the Ultra High-Frequency band. The CTX3 will broadcast audio over a distance of 700 metres in a cluttered urban environment, up to 1.2 kilometre with LOS, through concrete, drywall and thick bush to any UHF receiver.

Use this transmitter to remotely listen to an area of interest that requires discreet acoustic monitoring. We recommend any handheld UHF receiver capable of tuning into the 400MHz-434MHz range, this is a standard range in most UHF receivers. Our recommended handheld receiver is the Baofeng UV-5R or the AnyTone AT-318UV, you may also use any of our transmitters with SDR's. Your CTX3 will arrive with its specific Tx/Rx frequency noted on its back.

Power Supply Options

2x 6.8mm button cells (3V) : 12 Hours 

Hours Of Continuous Operation.

1x CR2032 (3v) : 29 Hours Of Continuous Operation.

1x 2600 mAh 18650 (3v) : 260 Hours Of Continuous Operation.

1x 3600 mAh 18650 (3v) : 360 Hours Of Continuous Operation.

2x AA Alkaline (3V) : 210 Hours Of Continuous Operation.

Dimensions 6.39mm x 18.56mm 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: 3g
Output (RF) power  14mW
Antenna 60mm OR 110mm: .5-.8mm NiTinol.
Frequency Range

430MHz-439 MHz, 2.5 kHz step.

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

TINYTX's transmitters are easily paired with any compact hand-held transceiver. Any Two-Way UHF Radio will work, but we recommend the BaoFeng UV-5R from FengBros. Fengbros has been our trusted supplier for the last year, they offer certified Baofeng radios at the most competitive price.

In order to maintain its longevity, the CTX3 is potted with a compound that seals all onboard components, only the microphone and the battery terminal pads 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.