400-470MHz UHF Duplexer 50W Radio Repeater Duplexer - Tunable

In this review of the 400-470MHz UHF Duplexer the bottom line is straightforward: this is a compact, factory preset duplexer built for low-power repeater systems that need reliable channel separation. The reviewer found it most useful for installers and radio hobbyists who run 50W VHF/UHF repeaters and need a pre-set pair (462 MHz send, 472 MHz receive) with the option to retune across the 400-470MHz band. It is practical, well specified for its class, and uses durable N female connectors for easy integration.

Key Features

• Factory preset frequencies: Ships preset to 462 MHz (low) and 472 MHz (high), saving setup time for common repeater pairs.
• Tunable across 400-470MHz: Allows adjustment within the UHF band so users can retune the duplexer to match site-specific channel spacing.
• N female connectors: Standard N female connectors make it straightforward to attach coax feedlines and existing repeater hardware.
• 50W power handling: Rated for up to 50W input power, suitable for lower-power repeater installations and test setups.
• Good isolation and low loss: With around 75dB isolation and about 1.2dB insertion loss, it preserves signal quality between transmit and receive paths.
• Compact repeater use: Designed to handle typical repeater frequency spacing and reduce interference in small system deployments.

Who It's For

This duplexer is aimed at radio technicians, small-club repeater operators, and amateur radio enthusiasts who operate low-power repeaters or need a compact passband solution for a 400-470MHz system. Its preset to 462/472 MHz makes it convenient for setups that match those frequencies and speeds initial deployment.

It is less appropriate for high-power commercial repeaters or fixed infrastructure that requires higher than 50W handling or custom connector types; users with those needs should look for industrial-grade duplexers with higher power ratings and broader environmental specifications.

Pros & Cons

Pros

• Factory preset pair (462/472 MHz) reduces initial setup time for matching repeater channels.
• Tunable across the 400-470MHz range so it can be adapted to nearby channel plans.
• Strong isolation (~75dB) and modest insertion loss (~1.2dB) keep transmit/receive paths well separated.
• N female connectors are durable and widely compatible with common coax assemblies.

Cons

• Maximum input power of 50W limits this unit to lower-power systems and hobby use.
• Specification sheet is basic and lacks environmental ratings for outdoor fixed installations.

Specifications

Model	SGQ-450
Low Frequency	462 MHz
High Frequency	472 MHz
Frequency Range	400-470 MHz (tunable)
Max Input Power	50W
Insertion Loss	1.2 dB
Isolation	75 dB
Connector	N female

Our Verdict

The 400-470MHz UHF Duplexer delivers sensible performance for small repeater systems: it is a good value for hobbyists and small-club operators who need a tunable, preset duplexer with solid isolation and N female connectors. Buy it if you operate at or near the preset 462/472 MHz pair or want a tunable, low-power solution; professional higher-power sites should choose a unit rated above 50W.

Frequently Asked Questions

Can the duplexer be retuned to other frequencies within 400-470MHz?
Yes, it is tunable across the 400-470MHz UHF range so installers can adjust it to other channel pairs within that band.

What connector type does it use?
The duplexer is equipped with N female connectors for both transmit and receive ports.

Is this suitable for high-power repeater sites?
Not for high-power sites; the duplexer is rated for a maximum input power of 50W and is best for low-power or hobby repeaters.