VHF Collars for Small (Rodent-sized) Mammals (CHP)

The information below on discontinued products is provided for individuals who are still using these older systems. Product descriptions may be time sensitive or even outdated. Please contact Telonics if you have questions.
CHP Configurations
CHP Configurations (CHP-6P and -8P on Tygon tubing collars, CHP-4P and -9P on butyl collars)

Telonics CHP transmitters are designed to maximize operational life in a small, lightweight package.

These configurations use a low-power transmitter, and are mounted on very small collars. Therefore, the antenna is necessarily much shorter than the quarter-wavelength antenna typically used with larger transmitters. These factors result in reduced signal radiation compared to larger transmitter configurations, and range of these systems is usually less than a kilometer on the ground.

Several collar designs are provided as examples but other collar configurations are possible. Please consult with our staff with any questions or if you have specialized requirements.

Units can be refurbished by Telonics to the original configuration.


Configuration Dimensions L x W x H (in, cm) Unit Weight (g) Approximate Weight including Collar (g) Collar Characteristics Life @ 60BPM
Life @ 30BPM
CHP-4P 1.0 x 0.8 x 0.6
2.5 x 2.0 x 1.5
13.5 18.5 1/16" Butyl 19 28
CHP-5P 1.35 x 0.5 x 0.3
3.4 x 1.35 x 0.7
6.8 8.3 Tygon tubing 7.4 13.4
CHP-6P 0.9 x 0.5 x 0.3
2.3 x 1.3 x 0.7
3.7 5.0 Tygon tubing 3.7 6.7
CHP-7P 0.8 x 0.35 x 0.3
2.1 x 0.9 x 0.7
2.2 3.3 Tygon tubing 1.5 2.8
CHP-8P 0.8 x 0.3 x 0.15
2.05 x 0.8 x 0.4
1.2 2.2 Tygon tubing 0.5 1.0
CHP-9P 0.80 x 0.5 x 0.6
2.05 x 1.45 x 1.6
6.2 11.0 1/16" Butyl 7.4 13.4

Note: Dimensions and weights indicated are for the transmitter electronics, power supply, a 4" lightweight whip antenna, and packaging. Inclusion of a collar will increase the overall weight; such weights have been estimated but depend on collar design. Alternate antennas might also increase weight.

Temperature Sensing Option

S2 Temperature Sensor. This sensor provides a variable pulse rate dependent on temperature within the transmitter package. The user specifies a desired pulse rate at an anticipated median temperature and the approximate range of temperatures to be monitored. Pulse rate increases at higher temperatures and decreases at lower temperatures.

Transmitter Electronics

µCHP Transmitter General Specifications

Photo Gallery

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.

Warranty: CHP VHF Transmitting Subsystems

The CHP VHF Transmitting Subsystem includes the following main components: internal digital, radio frequency electronics comprising the transmitter, power supply (battery), exterior packaging, transmitting antenna, and attachment. A refurbished Subsystem is warranted as if the Subsystem was purchased new, unless otherwise stated.

Telonics warranties only the following with respect to the Subsystem:

1.1 The exterior packaging integrity of CHP subsystems with external antennas are warranted for the operational life of the Subsystem, up to a maximum of three (3) months from the date of initial shipment of the Subsystem by Telonics.


Although each Subsystem is supplied with a power supply in the form of a battery, Telonics does not manufacture batteries (electrochemical cells), and therefore cannot warranty the battery lifespan, mechanical integrity or other battery performance issues. However, Telonics conducts extensive testing of all types of electro-chemical subsystems to determine suitability to the application. Once an electrochemical system is chosen for a configuration, testing procedures are employed at Telonics to evaluate every individual battery that is installed in each transmitting subsystem. Even using these advanced testing procedures it is not possible to determine a specific battery's lifespan ormechanical integrity.

Telonics conducts tests to assure that each unit is transmitting at the power level selected by the user. Actual range performance is a system characteristic dependent upon numerous conditions including receiver sensitivity and noise figure, receiving antenna tuning and pattern, transmitter antenna integrity, line of sight conditions in the field, and vegetation and habitat conditions and other factors specific to individual study sites. Therefore it is not possible to warranty a minimum range that will be achieved for units deployed in the field.

"Packaging integrity" as applicable to 1.1 above, is limited to normal wear as encountered when attached to the animal.

Antenna breakage statement

It is the purchaser's obligation to make certain that it orders the correct size and type of Subsystem for the particular type and size of animal that the Subsystem will be applied to, and no warranty is expressed or implied for any failure to meet operational specifications due in whole or in part to use of an incorrect size or type of Subsystem.

No warranty is expressed or implied with regard to abnormal events or damage due to human actions such as gunshot damage, vehicle encounters, etc. Further, no warranty is expressed or implied with regard to damage resulting from misuse, accidents, unauthorized service, extreme conditions, or other causes not specifically enumerated herein.

The entire risk, as to the results and performance of the Subsystem, 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. Telonics' and its suppliers' maximum aggregate liability shall not exceed the amount paid by the customer for the Subsystem.

Exercising the Warranty

If a defect occurs, return the Subsystem to Telonics within the applicable time frame noted above at the following address: TELONICS, 932 E. IMPALA AVENUE, MESA AZ USA 85204-6699. 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. Customer shall arrange for and pay all shipping, insurance and related charges incurred in the shipment of Subsystems to and from Telonics under this warranty.

Upon the timely return to our facility within the applicable time frame noted above, if the exterior packaging integrity and/or internal electronics (excluding batteries) are defective, the Subsystem will be replaced or repaired, at Telonics' sole discretion, at no cost to the customer, other than shipping charges. 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 above warranty extends only to the original purchaser and does not cover any Subsystem which is resold or otherwise transferred from the original purchaser to another party. The warranty will be extended to customers who purchase the Subsystem directly from a Telonics-authorized distributor.

Lithium Battery Shipping Regulations (pertains only to CHP-4P)

Telonics, Inc. ships all systems containing lithium batteries in accordance with United Nation and US Federal regulations for shipping hazardous materials.

49 Code of Federal Regulations

IATA Dangerous Goods Regulations (current year)