ALERT2 Repeater/Concentrator – 330X Series

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The High Sierra Electronics, Inc. 330X Series of ALERT2 Repeaters/Concentrators supports ALERT2, the next generation of wireless communication protocol for use in real-time hydrologic monitoring systems.


  • Receives and Forwards ALERT2 Data
  • Programmable
  • Optional Sensor Inputs
  • Can be Equipped to Receive ALERT

High Sierra Electronics 330X Series of ALERT2 Repeater/Concentrator supports ALERT2, the next generation of wireless communication protocol for use in real-time hydrologic monitoring systems. Many configurations add concentrator capability which means that the unit will also receive ALERT data and retransmits it as concentrated ALERT as defined within the ALERT2 Protocol.

The ALERT2 Repeater/Concentrator receives and re-transmits ALERT2 data. Many configurations add concentrator capability, which means that the ALERT2 Repeater /Concentrator will also receive Legacy ALERT data and re-transmit it as Concentrated ALERT, as defined within the ALERT2 Protocol.

The 330X Series of Repeaters/Concentrators are offered in three different types of enclosure with a variety of options available in each of the different enclosures. Refer to the Ordering Matrix for more details.

One of the great advantages of the ALERT2 Protocol is the use of TDMA (Time Division Multiple Access). This allows a network design which assigns specific time slots for every gauge and repeater’s transmission. The result is virtually no data loss due to data collision which is a common occurrence in larger ALERT systems.

For existing ALERT Systems transitioning over time from ALERT to ALERT2, a Repeater will also need to operate as a Concentrator. This can be accomplished either through the inclusion of an internal ALERT receiver/decoder, or the ALERT data can be imported via serial cable from an existing ALERT repeaters if it is equipped with a serial output stream. If the ALERT receiver is internal the Repeater/Concentrator will be equipped with three radios; one to receive ALERT2, one to receive ALERT and a third for ALERT2 data retransmission. When the system design permits half duplex, then a single radio can receive and retransmit ALERT2 messages.

All HSE ALERT2 Repeater/Concentrators include an Ethernet port. Data can be exported via the Ethernet port to any Ethernet ready device such as a router or cell modem for transmission to the system base station.

Any unit that includes internal ALERT concentration capability also offers the availability of sensor inputs. The range of sensor inputs is identical to the sensor range of the HSE Models 3306, 3316, and 3512 and include battery and GPS status reports for the repeater. Power requirements vary depending on the Repeater/Concentrator configuration and the anticipated volume of data to be re-transmitted. Most sites will operate effectively with a 75 Watt Solar Panel and 36 Amp hours of battery capacity. If needed, a High Sierra Electronics Applications Engineer can calculate the required power system given the specifics of your site.


Data Format ALERT2 (Some models also receive ALERT)
Data Output Serial port female DB9 connector
Serial Data Rate 19,200 BAUD, 8 Data Bits, 1 Stop Bit, No Parity
Frequency Range VHF 135 – 174 MHz
Switch Selectable Define up to eight frequencies when ordering unit
Squelch Open for ALERT2, Squelch for Internal ALERT receive
Radio Type Ritron DTXL
Operating Voltage 12 to 18 VDC
Current Draw < 200 mA or 250 mA with Internal ALERT
Fuse 3 Amp
Antenna BNC Female
Ethernet RJ45
Power Two 3-Pin MS connectors (one for power source & one for external back-up battery)
Demod & Encoder Console 9-Pin serial male
Serial In 9-Pin serial male (serial port for ALERT option)
Enclosure Aluminum box with external connectors
Operating Temperature -22° to 122° F (-30° to 50° C)
Dimensions (Model 3302-IFPSN) 13 x 3.75 x 14.5 in (33.02 x 9.525 x 36.83 cm) (W x H x D)
Weight (Model 3302-IFPSN) 12 Lbs (5.4 kg)
Shipping Weight (Model 3302-IFPSN) 17 Lbs (7.7 kg)

Ordering Guide


For example, a 3302-IFNSN would specify a Receive antenna split between ALERT and ALERT2 Receivers, operating in full duplex without a Power Amp or Receive Crystal Filters in a rack mount chassis.


Each Model number includes a five letter suffix indicating the exact configuration of the unit.

The first letter in the suffix indicates whether or not the unit is equipped to receive and decode Legacy ALERT data. An “I” indicates that the unit has an internal receiver / decoder dedicated to receiving and decoding Legacy ALERT data for re-transmission as Concentrated ALERT following the ALERT2 Protocol. An “S” in the first position indicates that Legacy ALERT data will be ingested from an external source via a serial connector on the enclosure. An “N” indicates that the unit is not ingesting Legacy ALERT data and serves only as an ALERT2 Repeater.

The second letter in the suffix indicates whether the Repeater/Concentrator will operate in full or half duplex mode. Full duplex means that the Repeater/Concentrator will receive and transmit simultaneously. This mode requires at least a 1 MHz separation between the transmit and receive frequencies and adequate vertical separation between the transmit and receive antennas. Half duplex means that the unit will not receive while transmitting. In most ALERT2 Systems the use of TDMA time slots will enable all the data throughput needed in half duplex mode. An “F” in the second position indicates full duplex and an “H” indicates half duplex.

The third letter in the suffix indicates whether or not the unit has a power amplifier. A “P” in this position indicates that a power amp is installed and an “N” indicates that there isn’t.

The fourth position in the suffix indicates whether or not an antenna splitter or multi-coupler is in use. These devices allow two receivers to utilize a single receive antenna. The splitter is a passive device that does not draw any power but does introduces a minor amount of signal loss. While the multi-coupler does not introduce any signal loss it does draw power and therefore most commonly used at AC powered sites. An “S” in the fourth position indicates a splitter is included, an “M” indicates that a multi-coupler is in use and an “N” indicates that neither is used.

The fifth and last letter of the suffix indicates whether or not a Crystal filter(s) is installed. Crystal filters are used in noisy radio environments that can be found at many mountaintop repeater sites. It should be noted that Crystal filters do induce some signal loss on the incoming signal and in some cases adequate filtering can be accomplished with external band pass cavity filters that lower signal losses. A “C” in the fifth position of the suffix indicates the presence of a Crystal filter(s) and an “N” indicates that no Crystal filter is in use.