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Crystal controlled UHF audio transmitter

Extremely miniaturized crystal controlled UHF audio transmitter. Exceptional audio performance. Automatic gain control. Microphone cable length on request. A distance of approximately 500/700 meters can be reached in open field thanks to the power output. The performance obviously depends on the environmental conditions and the sensitivity of the receiver utilized. To obtain the highest performance, it's recommended the use of the transmitters listed in the catalogue, combined with our receivers.

Camouflage solutions

In combination with the 3V lithium battery the product fits completely hidden in articles of clothing. Application of different power supply voltages provides variable output power of the product within 10 - 30 mW limits.

The transmitter can be also concealed into:

  • Pieces of clothing and footwear
  • Jewelry and accessories
  • Pieces of interior and furniture
  • Room finishing materials
  • Home electric appliances and electronics
  • Items of packaging
  • Communications means
UHF Audio transmitter


Microspia ambientale UHF

Caution of use

It is recommended to integrate the product inside dielectric camouflage substances with low RF absorption ratio. Allocation of the product above metal surfaces can decrease radiation efficiency of the product. While selecting a power supply source please take into account the data-sheet current value of the power source, which should be not less than the consumption current of the product.

Special characteristics

  • Super compact (9 × 18 × 3 mm)
  • High quality audio
  • Low power consumption
  • Wide range of power supply voltages
  • Variable output power
  • Crystal frequency control
Frequency 416.5 – 423.5 MHz (mod. A) / 293-390 MHz (mod. B)
Frequency control crystal
Relative frequency instability (0°C to +40°C) 0.01%
Modulation WFM
Max deviation of frequency non-linear distortion factor 7% ± 50 kHz
Attenuation of harmonic and sub-harmonic components 20dB
Audio response 0.3 - 6 kHz
Output power U=3V 7 mW
Output power U=6V 30 mW
Current consumption U=3V 10 mA
Current consumption U=6V 20 mA
Range of operation SNR 30 dB ( U=3 V) Icom receiver R10 =100 m
Special receiver PRK 040 =100m
Power supply 2.4 – 6 VDC (mod. A) / 2.8 - 4.5 VDC (mod. B)
Time of continuous operation 5 days
Microphone external
Microphone sensitivity over 10m
Antenna flexible, 180 mm
Length of power supply cable 100 mm
Operating temperature from 0°C a + 40°C
Dimensions 9 × 18 × 2.8 mm
It is suggested using the audio transmitter along with:

Transceivers > IC-ERRE / Micro recorders > Digicel 280

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Disclaimer: The customer is responsible for the knowledge of the laws that rule the use of these devices in his country.

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