The Sierra Radio Systems SIR-335 is a two port RF watt meter control module for the Sierra Station Controller range.

Also known as the WM-1, this module allows compatible WaveNode RF sensors to be integrated into a Sierra Station Controller system, providing remote monitoring of forward power, reflected power, and SWR from the Station Controller dashboard.

The SIR-335 supports one or two active RF power monitoring sensors, allowing two RF paths to be monitored from a single control module. Any combination of compatible HF, low-power HF, or VHF/UHF WaveNode sensors can be used, making it suitable for HF stations, QRP setups, VHF/UHF systems, repeaters, and remote installations.

The module can provide periodic power measurements, streaming data with a refresh rate of less than one second, and repeater keying and monitoring functions. It also includes PTT input and PTT output connections, allowing transmitter activity to be monitored and, where required, keyed for testing.

Key Features

• Two port RF watt meter control module
• Also known as the WM-1
• Integrates compatible WaveNode RF sensors into a Sierra Station Controller system
• Supports 1 or 2 active RF power monitoring sensors
• Measures and reports forward power
• Measures and reports reflected power
• Allows SWR monitoring through the Station Controller dashboard
• Supports periodic measurements
• Supports streaming data with less than 1 second refresh rate
• Can be used for remote repeater keying and monitoring
• PTT input for monitoring transmitter status
• PTT output for transmitter keying during testing
• Compatible with HF, low-power HF, and VHF/UHF WaveNode sensors
• Control over Sierra DCN
• Suitable for remote stations, repeaters, and station monitoring systems

Compatible WaveNode Sensors

The SIR-335 requires at least one compatible WaveNode RF sensor or directional coupler. The sensor is not included and must be purchased separately.

Suitable sensors include:

Any combination of compatible HF and VHF/UHF sensors can be used at the same time, up to a maximum of two sensors connected to the module.

Typical Uses

• Remote RF power monitoring
• Forward and reflected power monitoring
• SWR monitoring through the Station Controller dashboard
• Remote HF station monitoring
• Repeater power monitoring
• VHF/UHF station monitoring
• QRP or low-power station monitoring with the correct sensor
• Monitoring amplifier output power
• Monitoring antenna system performance
• Remote transmitter test keying where appropriately configured

Station Controller System Role

The SIR-335 adds RF power monitoring to a Sierra Station Controller installation.

It connects to the Sierra DCN, or Device Control Network, using RJ45 style connections and network-style patch cables. The DCN connection is used for module communication and can also provide system power when connected to a suitable Sierra Station Controller host or powered DCN system.

The Station Controller can poll the watt meter module and update the dashboard. A power measurement can also be triggered from the dashboard when required.

Although the DCN connectors are RJ45 style, they are not standard Ethernet ports and should only be connected to compatible Sierra Station Controller modules and accessories.

Connections and Functions

Specifications

Important Note

This listing is for the SIR-335 Two Port RF Watt Meter Control Module only.

At least one compatible WaveNode RF sensor or directional coupler is required. The RF sensor is not included and must be purchased separately.

SIR-310 host adapter, installation kit, DCN hub, power supply, RF sensors, coaxial cables, antennas, transmitters, amplifiers, and other accessories are not included unless stated otherwise.

A suitable 12V DC supply is required when the module is not being powered through a Sierra DCN connection from a suitable Station Controller host or powered DCN system.

The Sierra DCN uses RJ45 connectors and network-style cables, but DCN connections are not standard Ethernet connections. Do not connect DCN ports directly to normal Ethernet network equipment.