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TOPIC: Any possibility of third party external ATU?

Any possibility of third party external ATU? 02 May 2021 20:16 #1

Hi I would like to buy SunSDR2 DX, but I could not find any info if it is somehow possible to connect third party external automatic tuner like MFJ-939. Is it really not possible? Is it necessary to use EE original ATU? Thank you.
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Any possibility of third party external ATU? 20 May 2021 10:38 #2

  • OK8WW
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Using ICOM AH-4 tuner. Any chance to connect this one?
Richard OK8WW / OM2TW
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Any possibility of third party external ATU? 23 May 2021 07:02 #3

  • VK6NX
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OK4SEA wrote:
Hi I would like to buy SunSDR2 DX, but I could not find any info if it is somehow possible to connect third party external automatic tuner like MFJ-939. Is it really not possible? Is it necessary to use EE original ATU? Thank you.

Wow! :pardon:
And what exacty you think would be the problem connecting devices like MFJ-939 to SunSDR? Its what MFJ calls "plug and play", if I do recall correctly. Just put "classic" cable away.

I have successfully used MFJ-993B for almost 3 years with SunSDR2 (non Pro). And it did the job.
Up until I came up with new ideas and started to build my own ATU.
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Any possibility of third party external ATU? 23 May 2021 11:02 #4

  • xuanca
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I have an ATU-100 from N7DDC connected and it works very well. I only use it for 40, 60 and 80 Meters, for the rest of the bands I don't need it.

EA1AHA
Juan Carlos
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Any possibility of third party external ATU? 12 Jan 2022 10:19 #5

  • 9V1PL
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OK8WW, any luck so far? I too am looking for this solution.
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Any possibility of third party external ATU? 12 Jan 2022 15:45 #6

Hi,
The AH-3/4 can be used with non Icom radios of any sort including the SunSDR 2 DX by using this simple interface

pacificcoastsail.com/PCSC_working/Blog/BOAT%20RESOURCE%20LIST%20VIP/mods_dk%20-%20ICOM%20-%20AH-4.htm

It works fine for me with my SunSDR2 DX . I am also using an LDG AT-200 Pro II autotuner on the other HF antenna socket for my other antenna so both are available as required.

73 gd DX
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Any possibility of third party external ATU? 12 Jan 2022 16:49 #7

  • danielwee
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Has anyone figured out how the SunSDR2DX determines if an ATU-100 is attached? Does this depend on the RS485 data or simply the status of ATU_IND or ATU_TUNE lines? I'm trying to see if I can build a "translator" that makes the AH-4 appear to the radio as an ATU-100 to simplify the tuning.
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Any possibility of third party external ATU? 13 Jan 2022 02:35 #8

  • VK6NX
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(Obviously) 1. the most "easiest way" is to ask Roman and 2. the most "proper way" is to make feature request to add new TCI command (EXT_ATU or something) with necessary parameters.
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