MAT-10 Auto ATU — The Ideal Portable Antenna Matching Unit

A compact, battery-powered antenna tuner that handles the full HF range can transform a portable station. The MAT-10 (also referred to as the Mac-10 in some notes) is a small, metal-cased auto ATU designed to cover 1.8 to 54 MHz and cope with up to 30 watts. It is built specifically with portable QRP operations in mind and proves surprisingly capable even on difficult antenna setups.

Key specifications and physical features

• Frequency range: 1.8 to 54 MHz (covers 160 through 6 metres)
• Power handling: up to 30 W — intended for QRP and low-power radios
• Power source: internal rechargeable lithium battery, charged via USB
• Connections: two BNC sockets (transceiver and antenna) plus a multi-pin lead supplied (wired for Yaesu FT-817/818 style radios)
• Display/controls: row of LED VSWR indicators, multi-function push button for on/off, bypass and tune
• Construction: metal case with latching relays so tuning settings are retained even with power removed

The MAT-10 is deliberately simple and rugged. Its rechargeable battery gives a full day—or more—of typical QRP use. The LED VSWR bar is easy to read outdoors and avoids squinting at tiny displays on pocket transceivers. Because the relays latch, once you tune an antenna you can switch the ATU off and the tuned network remains in circuit. For lightweight field work this saves battery and reduces the kit you need switched on.

Practical tests demonstrate the MAT-10 handles a surprising variety of antenna conditions:

• 20 metres: Rapid, one-shot tune to a near 1:1 VSWR from a 5 W carrier.
• 80 metres: Challenging for short end-fed wires; the ATU sometimes needs a second attempt but can reduce VSWR to an acceptable level (below 2:1) so the transceiver can deliver power.
• 160 metres: Even with a highly reactive, short random wire the MAT-10 can find a good match — tests yielded roughly 1.2–1.3:1, making operation possible where many built-in tuners fail.

In short, the MAT-10 will often rescue marginal or non-resonant portable antennas and let you use a low-power transceiver across a wide portion of HF.

The MAT-10 pairs especially well with small rigs that lack built-in ATUs. Two practical points to note:

• QRP Labs QMX: The QMX offers a menu-driven "Tune VSWR" function that transmits a steady carrier at roughly half power to protect the PA. The MAT-10 will tune from the few watts produced in that mode, so the QMX plus MAT-10 makes a neat, self-contained portable kit.
• Yaesu FTX-1 Field and IC-705: The MAT-10 works fine with these radios. The supplied multi-pin lead is typically wired for FT-817/818 style radios; the MAT-10 does not strictly require a control lead for auto-tune — it only needs RF present and the front-panel push button to trigger tuning. Be mindful of the 30 W rating when using higher-power rigs.

1. Connect the transceiver to the MAT-10 (BNC) and the MAT-10 to the antenna.
2. Set the transceiver to a steady carrier mode (AM carrier or the radio's tune function).
3. Key the transmitter at an appropriate low-power level (many QRP rigs have a tune/low-power carrier option).
4. Press and hold the MAT-10 multi-function button while transmitting; the tuner will cycle and the LED bar will show progress.
5. When the LED indicates a low VSWR, release the button and operate normally. If needed, try a second tune attempt for stubborn matches.
6. If you wish to preserve battery life, turn the MAT-10 off after tuning; the latching relays will retain the match.

• Power limits: Stick to the MAT-10 recommended 30 W maximum. It is optimised for QRP use — 5 W to 10 W transceivers are ideal.
• Short, reactive antennas: High VSWR antennas can be matched for useful operation, but be aware that losses in short coax or mismatched feedlines still exist. Matching allows the transceiver to deliver power; it does not remove feedline loss.
• Cable compatibility: The supplied multi-pin lead is useful for some Yaesu models but may not suit all radios. The tuner will still operate without the special lead when fed with RF and the tune button is used.
• Battery life: Very economical for an auto-ATU. Typical portable use should give a full day of operation; the top-row LEDs serve as a quick battery indicator.

The MAT-10 is an excellent choice for operators who want a small, affordable, self-contained ATU for field days, SOTA activations or general portable QRP work. Pair it with a lightweight transceiver such as a QMX, Yaesu FTX-1 Field or IC-705 and you have a very capable portable HF station from 160 to 6 metres.

Summary

Small, robust and practical, the MAT-10 delivers fast automatic tuning across the HF bands, retains settings with latching relays, and works from its internal rechargeable battery. It is a cost-effective alternative to larger auto-ATUs and a strong candidate for anyone putting together a compact QRP kit.

For portable operations where weight, battery life and straightforward operation matter, the MAT-10 is worth a close look.

For more information please visit our online store or alternatively contact us and our team will be happy to assist you.