Elecraft T1 Miniature ATU for all Low-Power Transceivers product reviews by real people like you. Only at – is a Web site dedicated to ham. Elecraft Automatic Tuner, max 20W, ready built. Symmetrical Antennas with optional BalUn, Longwire with BNC/Banana Plug Adapter. Elecraft Automatic Tuner, max 20W, kit. Symmetrical Antennas with optional BalUn, Longwire with BNC/Banana Plug Adapter.

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Arduino – Elecraft T1 Interface

Inside the mini-DIN plug, is a tiny circuit board made with SMD components, including a tiny microprocessor control unit. The 3B weighed around g versus the g of the 2B which came before.

A couple of early builders had apparently found that the components in the tuner’s SWR bridge warmed up a bit too much under certain conditions, so Elecraft produced a eledraft, substituting some higher wattage resistors and adding an extra toroid core to beef up one of the transformers. The settings and band are stored, allowing the T1 to return to this setting instantly the next time that band is used.

One of the things about Elecraft products is the enthusiastic customer base and the company’s responsiveness to criticisms and suggestions for improvements. Nothing wrong with the antenna, I can tune it using an Icom AH-4 or a manual tuner. I made the cable from a good quality shielded twin core microphone cable. The T1 is small enough and light enough to take everywhere the FT goes without destroying the radio’s unique advantage: I have thought about designing a variant that is open at both sides so that one can use a standard household rubber-band, too – this will have a better grip, but can get lost which is why I decided against that route for the moment.


A schematic for the interface is shown below. The T1 is available either ready built or as a kit. The T1 uses a comprehensive, three-stage tuning algorithm to ensure selection of the best of its relay combinations. The T1 tuned to 1: The green light would flash and I would hear the chirp that the tuner made while tuning. Latching relays are used, so the tuner draws no power from the battery, except when tuning. It is a kit, it is fun to build, it works good, it has excelent documentation, it is relatively cheap and it has open design with no secrets except maybe the firmware.

When the band changes, it turns on the T1 and sends it band information, allowing the antenna to be automatically tuned to the new band. It is very important to mount the parts in the same order as specified in the assembly guide, otherwise you may find yourself having a hard time.

The conversion algorithm uses averaging and linearization techniques to improve the accuracy of the measurements.

Elecraft T1 Miniature ATU for all Low-Power Transceivers Product Reviews

These pages are continually under construction and change – Please call back frequently to check them out again! I tried a new antenna.


Ive had mine for a few days. The completed board is shown below. There’s a “smart” adapter cable available for the Yaesu FT On the other hand, there is both internal and external antenna tuner elecarft in the K2 line.

The kit shipped on the day Elecraft promised, and a fortnight later a man from ParcelForce was knocking on the door asking for money. Each inductor and capacitor has its own DPDT relay, with the individual sections of each relay placed in parallel for reliability.

Contact the site with comments or questions. The T1 has the ability to receive band data from transceiver using a remote cable.

N5ESE’s Version of the Elecraft T-1 ATU ()

Since I can’t see the point of using a great big computer to control a little tiny radio, I don’t regard it as much of a problem. The elecdaft shows the small control board mounted on the main board. Yes, tuning with 9v would be better than 12v. Anyway, the remote controls capability from the FT works great. The coarse phase takes the longest time because the impedance is an unknown. I configured some virtual serial ports in Windows to monitor the signal being sent from DDUtil to the external device and found that it simply sends an IF CAT command on a repeating basis.