PT-350 Processor/Transmitter


The PT-350 Processor/Transmitter is the latest evolution in Telonics' line of remote intrusion detection equipment. The PT-350 detects infrared, magnetic or seismic events. The unit's small size and 1.5 watt RF power output make it ideal for short-term covert deployment. The PT-350 is user friendly, allowing the user to configure all field adjustable parameters via rotary and DIP type switches.

The PT-350 works with any one of the three detector types: seismic, infrared, and magnetic. The unit also supports an additional sensor input that provides a switch closure upon detection (i.e. breakwire, active infrared or pressure mat). An external camera may also be triggered by the unit.

The PT-350 is capable of transmitting messages in digital format, voice format, or both simultaneously (on different frequencies, if desired), and is compatible with all EIDS equipment, including repeaters and receivers. The digital coded message can be either the modified Manchester code or the SEIWG 005 code. Any standard VHF receiver can receive the voice messages, which can also include CTCSS sub-audible tones. By connecting a remote antenna to the PT-350, users can extend the transmission range.

The electronics are sealed in an aluminum housing with a removable battery case to facilitate ease of battery replacement. The standard power supply, 2 MN1604 batteries (standard 9V transistor batteries), provides up to 90 days of operational life. An on/off sensitivity selector switch is located outside the case; all other adjustments are made inside the battery compartment. These switches allow users to select the ID number, transmit frequencies (selectable between 2 pre-programmed frequencies), and seismic detection parameters. Using a Smart Cable and appropriate PC software, users can make frequency changes, adjust detection parameters, and select from any of the 40 standard CTCSS tones.

Telonics can sell this product only to law enforcement, military, and government agencies; these products are for use only within such agencies.

Key Features

  • Fixed, short-range transmitter power yields up to 3 miles transmission range (line of sight), dependent upon local conditions
  • Short-term tactical deployment yields up to 90 days of continuous operation
  • Pedestrian, animal, and vehicle discrimination
  • Fully field configurable via rotary/DIP switches
  • External field trigger for activating a camera system or other device
  • Compact and lightweight - approximately 1 lb.
  • Easily concealed
  • Transmits voice, digital, or both formats
  • Preferred by elite military forces worldwide



Size3.6 x 3.1 x 2.02 in
91.4 x 78.7 x 51.3 mm
Weight, with 2 EN22 batteries0.87 lbs
0.4 kg
CaseAluminum with integral battery compartment
ElectronicsSealed in case with all connections via sealed connectors
ColorOlive drab green
Sensitivity control1 external 6 position on/off switch
ID selection2 10-position rotary
Dispatch/seismic1 4-position dip switch
CTCSS Frequency select (voice coded units only)Programmable with user software
Programming jacks1 2.5 mm jack
External female connections1 4-pin (camera trigger, sensor)
External antenna connections1 BNC connector


Frequency bandAntenna tuned to 8 MHz block
Minimum frequency138 MHz
Maximum frequency174 MHz
Channel spacing100 Hz frequency steps (25 kHz channel spacing recommended)
Modulation typeNarrow band FM
Modulation deviation, typical+/- 3.0 kHz typical
Transmitter power output, low power1.5 W ±1 dB @ 9 V into 50 Ω
Transmitter power output, high power1.5 W ±1 dB @ 9 V into 50 Ω
Operating voltage, minimum5.8 Vdc
Operating voltage, maximum9.5 Vdc
Quiescent current, typical>75 uA
Peak transmit current, low power500 mA ±25 mA
Peak transmit current, high power500 mA ±25 mA
Power supply2 EN22 or equiv. (Std. 9V)
Digital codingEIDS/MIDS/EMIDS/REMBASS format
Voice codingSynthesized female
CTCSSSub-audible tones, all 40 standard tones user selectable
Tamper SensorAccelerometer
User Switch:
Input Voltage
Input Leakage
Sink Current
Output Voltage

15 V max
< 2 mA
15 mA max
500 mV typ (at max sink current)
Contact Switch
Internal Pull-up
External Pull-up

270 kΩ to 3.0 Vdc
15 V max


Minimum operating temperature-20° C
Maximum operating temperature60° C
Number of sensor inputs1
Waterproof3 feet
1 m
Maximum altitude25000 feet
7620 m
Maximum humidity100%

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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.