TUNE function contact closure

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KG4ODA

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May 18, 2021, 6:46:01 PM5/18/21
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Hello, I would like to enable contact closure output from HL2 when pressing TUNE button in PowerSDR. Is there a way to configure GPIO to do that?
I need contact closure for enabling 10dB attenuator to reduce external amplifier power from 270W down to about 15W. Drive setting is already set to 1 or lowest setting for TUNE function. 
Another way to achieve what I want is to enable GPIO contact input that will place PowerSDR into TUNE mode. I guess that can be done via CAT commands? So I will need some kind RS232 controller to tell PowerSDR to go into TUNE?

Thanks,

Anton

Alan Hopper

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May 19, 2021, 2:18:29 AM5/19/21
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Hi Anton,
another solution would be to tweak PowerSDR so it scales the iq data to extend the drive range to allow lower output.
73 Alan M0NNB 

Reid Campbell

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May 19, 2021, 3:15:26 AM5/19/21
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Hi Anton,

I think the signal you require is already there and is used to initiate an ATU tune. Have a look at

https://github.com/softerhardware/Hermes-Lite2/wiki/IO

The you are interested in the ATU RQST signal which will change state on a PowerSDR tune request. I'm not sure of the exact logic but there was some discussion in the following thread.

https://groups.google.com/g/hermes-lite/c/dZ-xuue0Ucw/m/tuD7iuKJDwAJ

Hope that helps. The Wiki is a bit light in information in this area, so if you get it figured out, drop us a few line on your findings and we can add it to the Wiki.

Cheers

Reid
Gi8TME/Mi0BOT
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KG4ODA

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May 20, 2021, 5:52:24 PM5/20/21
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Thanks for all your help, I will report back later once I get this working.
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