KRAIT Technologies

QRP Automatic Antenna Tuner
Mfr. No: KT-005
Ultra portable QRP ATU

Update: June 13, 2025

---------------------------------------------------------

Expected availability:

Mid of June 2025*

KT-005 User & Assembly Manual available! (NEW!) >> Official Release <<

KT-005 User & Assembly Manual [ENG version]

(Last update: June 13, 2025)

Product brochure:

KT-005 RELEASE information [ENG version]

(Last update: January 07, 2025)

---------------------------------------------------------

*) Why does ATU availability keep shifting?
Our policy is to deliver finished products, not initial protypes. Extensive testing
and corrections take considerable time. Thank you for your patience. The

project is, of course, ongoing.

Why were SMA connectors used in the circuit instead of BNC connectors?

The top priority was maximum miniaturization. Even the smallest right-angle
BNC connector would have noticeably increased the size of the device. In the
current design, there is literally no room left inside. It’s recommended to use
a convenient BNC-to-SMA adapter to connect the ATU directly to the transceiver.

---------------------------------------------------------

(05.06.2025) The first production units were fully assembled and tested.
Everything looks fine. I will soon be reaching out to those who expressed
interest in making a purchase.

(28.05.2025) All known bugs have been fixed. If the tests confirm

correct operation, the latest firmware will be uploaded to the units for shipment.

> The first production batch is reserved as a priority for those who have

expressed interest via email. Emails with availability information will

be delivered shortly.

>> The first production series will be available only as assembled devices.

The device is not easy to assembly due to high miniaturization of the components.

We want to make sure that everyone gets properly functioning ATUs.

>>> The first production run is several dozen pieces. We hope there

will be enough for everyone interested!

07.01.2025: ATU (KT-005) First production units undergoing final testing

07.12.2024: ATU (KT-005) series production begins

Price:

- assembled version in the enclosure: $219 or 199 EUR

- kit for self assembly (SMT components populated) + enclosure: $175 or 157 EUR

- kit for self assembly (SMT components populated) without enclosure: $150 or 134 EUR

- enclosure: $25 or 23 EUR

Shipping cost: (please contact directly for a detailed quote; the cost depends on the destination country; use the email provided below)

- European Union: up to 17 EUR

- Outside Europe: up to $45/40 EUR

Questions & Answers:

Q: Why ATU KT-005 project was created?

A: There were no ATUs on the market that were sized to fit the portable TRX QCX® and QMX® series. The KT-005 is twice as small as previously available solutions. Here we have portability without compromise.

Q: Is the visual resemblance to QCX®/QMX® TRX coincidental?

A: No. The ATU KT-005 is designed as an extension to QCX®/QMX® TRX series. Also in terms of visuals. Aesthetics matter. More products from this series on the way (e.g. KT-019 NanoSpeaker; check the datasheet in the bottom section).

Q: Why ATU KT-005 development take so long?

A: Well... The ATU project is much more complicated than it seemed at first. My quality goal is to fix all known bugs and offer a factory quality product, not a product in the prototype phase. I hope this will be understood and appreciated.

--------------------------------------

YouTube promotional video (published September 08, 2024):

---------------------------------------------------------------------------------

NanoSpeaker
Mfr. No: KT-019
Ultraportable high-efficient
active speaker for POTA/SOTA activations

KT-019 Preliminary User Manual available!!!

KT-019 Nano Spealer - User Manual [ENG version]

Expected availability:

series (black enclosure like KT-005) - end of Q3 2025

>> If you are seriously interested, let us know! The start of serial production depends on customer interest.

Price:

- assembled version in the enclosure: $45 or 43 EUR

- kit for self assembly (SMT components populated) + enclosure: $39 or 37 EUR

- enclosure: $25 or 23 EUR

NanoSpeaker (KT-019) in action (YouTube promotional video):

---------------------------------------------------------------------------------

SWRduino Mfr. No: KT-001K (kit) New tool for RF experiments with Arduino Uno board	RF Dummy Load Mfr. No: KT-002K (kit) or KT-002A (assembled) Cost effective HF + 6 m band 50R RF dummy load
Features Higly integrated QRP HF band SWR bridge up to 20 W Full compatibility with Arduino™ Uno board Tandem Match configuration for best directivity Only THT components for easy assembly Easy access to measured values (P fwd and P ref ) from ANALOG_IN input section Germanium diodes for best sensitivity Optional trimmers for precise adjusting SMA connectors for size critical applications (optional also BNC connectors) Equipped with ISP connector (2x3 pin header) Only passive components; no current consumption Mechanical Characteristics Full mechanical and electrical compatibility with Arduino™ Uno Board and LCD 2x16 shields Double-layer PCB Double-sided connectors for Arduino Compact design: 68 x 54 x 12 mm	Features Cost-effective HF + 6 m band 50R RF dummy load 100 W continuous power handling 300 W peak power handling capability Low VSWR levels up to 54 MHz UC-1 (PL-259) RF input connector Built-in fan for reliable continuous operation 2,1x5,5 DC input connector for the fan supply THT components for easy assembly Mechanical Characteristics Compact design: 80 × 80 x 75 mm (with fan) One layer PCB for easy components assembly Solid aluminum baseplate for the input connector
------------------------------------------------------------------------------------	------------------------------------------------------------------------------------
NCDXF/IARU Beacon Monitor Mfr. No: KT-003K (kit) or KT-003A (assembled) Useful tool for monitoring NCDXF/IARU beacons Available from June 2023! Features • Usefull tool for quick HF propagation condition check • Time synchronized with built-in GPS receiver • SYNC LED for monitoring synchronization state • CTRL button for band change • External DC_IN connector • Optional battery operation: 3x AAA (holes for a battery holder) • Current consumption: 60 mA @ 9.0 V • Input voltage range: 5.5-18.0 VDC • THT components only for easy assembly Mechanical Characteristics • Metalised front panel with set of LEDs and CTRL switch • Dimensions: 140 x 90 x 25 mm • Two layers PCB • Wooden enclosure available (sold separately) Application • Useful tool for easy HF propagation monitoring • Part of the radio shack KT-003 review on eHam.net: KT-003 Review ------------------------------------------------------------------------------------ NCDXF/IARU Beacon Monitor Mfr. No: KT-003E Wooden enclosure for KT-003 kit Features • Laser cut plywood housing (3 mm thickness) with mounting holes and metal spacers • Supplied in parts. Requires gluing.	CWduino QRP HF CW Transmitter Mfr. No: KT-004K (kit) Superportable CW transmitter for Arduino Uno board with keyer input Features • Highly integrated CW transmitter compatible with Arduino Uno board • HF band coverage: 80, 40 and 20 m (depends on version) • Class-E topology for high efficiency • Built-in 2nd harmonic notch filter to meet CFR requirements (-43 dBc) • 500 mW RF output power from 5 VDC Arduino’s power supply rail • 2000 mW RF output power at 9 VDC • Transmitter keying available from pin PD4 (IOL group) • Precise frequency adjustment via trimmer • Keyer input connector (mini-jack) • Equipped with SMA connector for size critical applications • Equipped with ISP connector (2x3 pin header) • Most components are THT for easy assembly • Example projects for Arduino: CW Beacon and CW keyer available free for download Mechanical Characteristics • Fully mechanical and electrical compliance with Arduino™ Uno board • Double-layer PCB • Compact design: 68 × 54 x 12 mm Application • Board for experiments with class E amplifier • Experimental CW transmitter controlled from Arduino • Automatic keyer with integrated TX stage • Part of Arduino's controlled beacon (in CW mode) • Battery supplied experimental TX module • Part of a portable CW transceiver

Buy these products NOW on:

> Available offers are visible to users in Europe (EU) only.

>> If you are interested in shipping to other parts of the world, please

contact us by e-mail to determine transport costs. In most cases it will

cost around $35-45.

	Products under development: NCDXF monitor + clock (GPS synchronized) (KT-013) MK II version of acclaimed KT-003 kit (available Q3/2025) Antenna Impedance Monitor (KT-014) Novel real-time antenna impedance monitor (available Q4/2025) Portable Active Speaker (KT-019) Compact powered speaker for POTA/SOTA operation (available Q2/2025) Ultra-portable CW Paddle (KT-025) CW paddle for POTA/SOTA operation (available Q3/2025)