Internal autotuner for mcHF SDR radio

This internal automatic antenna tuner is designed specifically for mcHF SDR radio.

You can install this autotuner to mcHF SDR radio with RF PCB versions: 0.4, 0.5, 0.6, 0.6.1, 0.6.2, 0.6.3

This autotuner have low profile and fit well in Chinese case for mcHF SDR radio.

Due to use of latching relays, the autotuner consumes energy only at the time of tuning. Power consumption of the autotuner is about 35 mA for 5V. After completing the tuning process, the autotuner turns off.

Operation

For control the autotuner, the E3 encoder in you mcHF SDR radio must be with a button.

Chinese cases are usually equipped with such encoders. If you have an E3 encoder without a button, first replace it with an encoder of the same height with a button (encoder not included in DIY KIT)

You need to buy either:

PEC11R-4215K-S0024 Shaft Type: Knurled or PEC11R-4215F-S0024 Shaft Type: D / Flatted

It depends which shaft type is on the other encoders in your radio Both of them are 21.5 mm high (from PCB to end of shaft) and all with a switch You can download installation and operation manual by click here (v1.03 Oct 03, 2019)

1. Tuning mode

Press and hold the E3 encoder button.

The LD2 LED will turn on green for 2 seconds.

After that, the LED will blink green for 2 seconds.

While the green LED is blinking, press the TUNE button of the transceiver.

The LED will turn orange and the autotuner will begin tuning.

When tuning is completed, the LED will turn red.

Press the TUNE button of the transceiver. The LED will turn off and the transceiver will go to RX.

2. BY PASS mode

Press and hold the E3 encoder button.

The LD2 LED will turn on green for 2 seconds.

Release the E3 encoder button while the LD2 LED is lit continuously.

The LED will blink three times and the autotuner will switch to BY PASS mode.

3. Disabling BY PASS mode

Press and hold the E3 encoder button.

The LD2 LED will turn on green for 2 seconds.

Release the E3 encoder button while the LD2 LED is lit continuously.

The LED will flash once and BY PASS mode will be turned off.

Internal automatic antenna tuner DIY KIT included:

  • fully assembled and tested autotuner PCB with flashed controller;
  • all parts and wires you needs to install autotuner to mcHF SDR radio.

All parts, using in this autotuner, are new and original.

E3 encoder with button not included in the DIY KIT.

Autotuner built by 5×5 schematic:

  • 5 inductances (T37 core): 0.1, 0.22, 0.45, 1 and 2.2 mH;
  • 5 capacitors (high voltage): 10, 22, 47, 100 and 220 pF;
  • 11 latching relays (IM43);
  • ATmega328 as controller and some smd parts.

Internal Autotuner for mcHF SDR Radio By Alexey UT0UM
https://www.mchf.at/
mcHF QRP Transceiver by Chris, M0NKA
http://www.m0nka.co.uk/
Installation by Sam, K9VPR
https://www.qrz.com/db/K9VPR
Thanks to Chris for the great mcHF, and Alexey for the fantastic tuner.

You can order mcHF AT DIY KIT here

DOWNLOAD

Installation and operation manual (v1.04 Oct 26, 2019)

NEW battery + case US $74.39
External 5Ah Battery Box Case Pack For mcHF SDR

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