Argos Electronics and Transmitting Antennas
Fig 1. ST-27-200A/ST-27-200L shown with option 710 (IDC ribbon cable interface to host)
Fig 2. ST-27-200A/ST-27-200L shown with option 730 (direct mounting interface to the host's printed wiring board)
Telonics has developed two Argos electronic modules designed for integration into customer provided systems. Meteorologists and oceanographers often develop highly specialized oceanographic buoys, meteorological balloons, and associated data collection instrumentation. By selecting and using these Argos certified packages, the user avoids the Argos certification process. The Telonics module handles all Argos systems timing issues, and transmission messaging parameters. This allows the user to concentrate efforts on other aspects of the experiment. This methodology is especially useful for users who will be deploying on a small to medium numbers of systems and for time critical applications.
Key Features - ST-27-200A
- Provides uplink capability for any combination of ID codes, RF frequencies, and repetition periods, all under host control
- Supports up to 7 independent Argos data buffers that the host can populate in real-time
- Transmits variable-length Argos messages with either 20 or 28-bit ID codes
- Serial interfaces supports TTL levels and baud rates from 1200 to 9600
- Argos certification allows researchers to forgo the rigorous certification process
- Auto repeat feature allows the ST-27-200A to repeat data without host intervention
- Failsafe feature alerts users upon communication link or host failure
Key Features - ST-27-200L
- Transmits the minimum Argos message as required by the Argos Specifications.
- Can support either 20 or 28-bit Argos ID codes.
- Argos certification allows researchers to forego the rigorous certification process
- Shutdown mode through use of an external switch (user provided)
- Flexible transmitter duty cycling programmable with TPP (sold separately). TPP configures the duty cycles and is also required for setting the transmitter's clock after the power supply has been disconnected.
||Size L x W x H (in, mm)
||Low Power (mW)
||High Power (mW)
||2.23 x 0.68 x 0.43 in
5.65 x 1.75 x 1.08 cm
|5 - 7
||500 (Typ) mW
||1000 (Typ) mW
||2.23 x .68 x .43 in.
5.65 x 1.75 x 1.08 cm
|5 - 7
||500 (Typ) mW
||1000 (Typ) mW
Other power levels are available, see the specifications for more details.
ST-27-200A and ST-27-200L Specifications
Option 710 (IDC cable interface)
|Size||2.23 x 0.68 x 0.43 in|
5.65 x 1.75 x 1.08 cm
Option 730 (PWB mount)
|Size||2.2 x 0.65 x 0.35 in|
5.59 x 1.65 x 0.88 cm
|Parameter||Specification [Test Condition] See Note 1|
|Supply voltage||2.85V min / 5.50V max|
|Operating temperature range||-30°C to 70°C|
|Quiescent current, typical||5 µA|
|Argos transmission frequency||401.618 to 401.622 MHz (Brazil SCD)|
401.630 to 401.680 MHz (Argos)
|Modulation (BPSK)||-1.1 to +1.1 ±0.1 Radians|
|RF output impedence||50Ω nominal|
[maximum recommended operating VSWR = 2:1]
|RF output power level||ST-27-200A|
316mW (+25dBm ± 1dB)
500mW (+27dBm ±1 dB)
850mW (+29.3dBm ± 1dB)
1000mW (+30 dBm ±1dB)
[Measured into 50Ω load over full temperature and voltage range]
|Transmit Current||316mW: 250mA typ / 300mA max|
500mW: 375mA typ / 425mA max
850mW: 625mA typ / 675mA max
1000mW: 700mA typ / 825mA max
[Measured at +25°C / 50Ω load / 3.6V supply voltage]
<30% variation from nominal transmit current for 2:1 VSWR, all phases.* See Note 2
<15% variation from nominal transmit current over operating temperature range.*
*Nominal transmit current for VSWR and temperature variation is referenced at 3.6V / 50Ω load / +25°C
|Spurious emissions||<-50 dBc|
|Frequency stability over temperature||± 0.5 ppm max from -30°C to +70°C|
|Initial programmed frequency accuracy||± 1.0 ppm max @ 25°C ± 2°C|
|Aging||± 1.0 ppm max (after 1 year)|
|Serial Interface Parameters||
● Asynchronous serial, standard NRZ format.
● One start bit, eight data bits, one stop bit, no parity.
● Least-Significant Bit First.
● Baud Rates: 1200, 2400, 4800, and 9600*
*Host Baud Clock Accuracy:
● ±3% for 1200-4800 baud
● ±0.4% for 9600 baud
1. The transmitter may suffer internal damage or perform poorly if the noted minimums and maximums are not strictly observed.
2. Transmit current and RF power out are sensitive to VSWR. Power out may decrease and/or current drain increase significantly if the antenna or antenna coax are of poor quality or do not correctly match the 50 ohm RF output impedance.
Related Links to Information on Other Websites
This information 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.
Telonics supports these products as possible based on availability of parts, software, or other considerations; but no longer sells them new.
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: Argos Transmitting Subsystems - Show
Telonics manufactures and offers for sale electronic assemblies for OEM applications. These packages and assemblies are designed to be integrated into complete systems with appropriate power supplies, packaging and in some cases user hardware and firmware.
Telonics warranties only the following with respect to the Subsystem:
1.1 The electronics assemblies are warranted to be free from defects in materials and workmanship and to perform to the operational specifications over the specified operating temperature range as published by Telonics for one year from date of purchase.
Telonics warranties only the electronic assembly that is provided to the purchaser.
It is the purchaser's obligation to make certain that they order the correct size and type of electronic assembly for the application. 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.
The user bears all responsibility for selection of the appropriate power supply, packaging and pressure and water proofing of the final subsystem.
In applications where the purchaser must supply firmware control over an electronics module, the purchaser is fully responsible for assuring proper integration and testing of the final subsystem.
No warranty is expressed or implied with regard to abnormal events or damage due to human actions. 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 electronic assembly, 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. Electronic assemblies must be returned to Telonics in the configuration they are were in when shipped to the purchaser. Assemblies should be returned without any customer hardware or packaging and with the original interface connectors supplied by Telonics. 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 electronic assembly 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 electronics assembly which is resold or otherwise transferred from the original purchaser to another party. The warranty will be extended to customers who purchase the electronic assemblies directly from a Telonics-authorized distributor.