Telonics TR-4 RECEIVER
Quality Electronics for the Wildlife Research Community.

Figure 1. TR-4 Receiver

Introduction

The TR-4 is a high performance, inexpensive telemetry receiver. It is small, lightweight, and designed for easy field use. The receiver can be tuned for operation within any user-specified 4 MHz band between 142 and 220 MHz. The TR-4 is microprocessor- controlled, allowing up to 100 channels to be programmed within the specified 4 MHz band. The TR-4 was designed for use in projects which require 100 or fewer frequencies, and in which the capabilities (and additional costs) of a scanning receiver are not required.

Notes on Usage

• The TR-4 is switched "ON" by rotating the control knob labeled "GAIN" clockwise from the "OFF" position. As the gain control knob is continuously rotated clockwise, the gain of the receiver increases. When switching the receiver "OFF", be sure to rotate the gain control knob fully counter-clockwise until it clicks into the "OFF" position.
• The TR-4 is a microprocessor-controlled receiver which can include up to 100 channels. The center frequencies programmed into each channel on the receiver at the time of purchase are listed on an enclosure entitled "Telonics TR-4 Programming Record," which is provided with the TR-4. Channels are selected via the push-switches. The receiver can be fine-tuned over a range of at least +/- 5 kHz (typically, -7 to +5 kHz), relative to the center frequency for each channel through use of the "FINE-TUNING" knob. For example, if a channel is programmed to be 150.220 MHz, then fine-tuning would allow coverage of 150.215 to 150.225 MHz.
• To achieve maximum sensitivity with the TR-4, the incoming signal should be tuned to the high side of "zero-beat." This is accomplished by slowly rotating the tuning control clockwise while listening to a signal with the gain control set as low as possible. When properly tuned, the pitch or tone of the signal will increase in frequency as the tuning control is rotated clockwise. If the pitch decreases as the tuning control is rotated clockwise, continue clockwise rotation through the zero beat (commonly noted as a dull thud, or "plop" sound) until the pitch increases with further clockwise rotation. The ideal tuning point is an 800-1000 Hz tone. If proper tuning cannot be reached prior to full clockwise rotation, it may be necessary to switch to an alternate channel. See the Programming Record for the particular frequency assignments for each channel on the individual TR-4 to select the most appropriate channel.
• The receiver is powered by either one or two 9-volt alkaline batteries, or by an external source. The batteries are not rechargeable and should be replaced when the "LO BAT" indicator on the front panel becomes lighted. (It is normal for this indicator to flash briefly as the receiver is turned off.) To replace the batteries, remove the small panel on the side of the receiver and snap out the old batteries. Replace with new 9-volt alkaline batteries, making sure that the batteries are positioned as shown by the polarity markings inside the battery compartment. Installing a 9-volt battery with polarity reversed will not contribute power to the TR-4; however, it will not damage the receiver nor will it discharge the battery. Some users may wish to install one of the two batteries in this manner to act as a spare, which can be readily reversed in the field in the event that the low battery indicator becomes illuminated. Suitable 9-volt alkaline batteries for the TR-4 include Eveready Energizer and Mallory Duracell brand names (batteries may be cross- referenced using the NEDA/ANSI Part Number 1604A).
• When powering the receiver from an external source, a coaxial power plug must be inserted into the jack labeled "EXT 12V" on the front panel. Telonics power cord RP-3-12 should be used when powering the TR-4 from a 12-volt DC source. The RP-3-12 is terminated with a "cigarette-lighter" plug with the center pin positive. Telonics power cord RP-2-110 should be used when powering the receiver from 110-120 volt AC, 50-60 Hz "wall" supply. The RP-2-220 power cord should be used with 220-240 volt AC, 50/60 Hz power sources. (The RP-3-12, RP-2-110, and RP-2-220 Power Cords may be purchased separately.)
• A BNC female connector labeled "ANT" is provided on the front panel. The coaxial cable used to connect the receiving antenna to the receiver should be a 50 ohm cable, with a BNC male connector. A variety of directional and omni-directional antennas may be utilized with the TR-4, and the optimal antenna depends on the user's application. All antennas should be specifically tuned to match the reception band of your receiver. Telonics RA-2AK "H" antenna is well suited for many tracking applications; the RA-2AK and other antennas are also available. Contact info@telonics.com for recommendations regarding antennas.
• We strongly recommend use of headphones, which allow detection of weaker signals and will make direction finding easier. The "PHONES" jack on the TR-4 is designed for a 1/8 inch, stereo or monaural plug, and audio output impedance is approximately 30 ohms. Lightweight headphones are provided with the TR-4. Other headphones or earphones with the appropriate impedance and plug can alternatively be utilized to suit the user's preference.

Telonics TR-4 Includes the Following:

• PK002399 padded carrying case with shoulder strap, belt loop, and accessory pocket
• Two 9-volt alkaline batteries (installed in receiver)
• Lightweight "Walkman-type" AU002433 Headphones

Telonics TR-4 Accessories:

• TR-PI Programming Interface software which allows the user to program channels in the TR-4 (CD-ROM).
• TSC-2 Smart Cable connects the TR-4 to the users PC for programming channels.
• TR-4 (Kit) includes TR-PI Programming Interface, TSC-2 Smart Cable.
• PK0001648 TR-4 Battery Compartment Door (Replacement).
• PS000340 9 volt Alkaline Battery.
• TNR 3000 Telonics Noise Reduction Unit
• EH-9151 Environmental Housing for TR 4 (Sexton Photographics, thesextonco.com)

TR-4 Specifications

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.

TR-4 Warranty

Telonics warrants the TR-4 to be free from defects in material and workmanship for 90 days (see Extended Warranty below) 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.

Extended Warranty

Two extended warranties for the TR-4 are available at additional cost when the TR-4 is originally purchased.

• One-year warranty extension extends the above warranty by a period of one year (i.e., to 15 months from the date the receiver is shipped from our laboratory at the time of original purchase).
• Three-year warranty extension: extends the above warranty by a period of three years (i.e., to 39 months from the date the receiver is shipped from our laboratory at the time of original purchase).

Non-Warranty Service

If problems are encountered outside the warranty period, or if non-warranty service is required, send the receiver and a description of the problem and/or service to be performed to our laboratory. Shipping charges to our laboratory must be prepaid. We will perform the required service and return the receiver to the address specified. Labor charges and parts will be charged at current rates, and return shipping charges will be added to the invoice.