Added the following at line 748 of :

? ? ? ? ? ? SetRF_OutAtten(adjuster);

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The version on GitHub should be able to set the TX attenuation now -- can't test it myself unfortunately.

On Monday, April 14th, 2025 at 2:56 PM, Oliver KI3P via groups.io <oliver@...> wrote:

I'm away from my radio at the moment. Can someone with a working radio confirm that this affects them too? Will take a look at the code tonight and see if I can find anything obvious.

-------- Original Message --------
On 4/14/25 1:33 PM, K9HZ wrote:

Good question… the TX attenuator should work the same way… so either there is a bug in the software… or there is a problem with the MCP23017. Since the RX side works I think its probably a bug in the code. Oliver will know.

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Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

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Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

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Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it:

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Moderator: North American QRO Group at Groups.IO.

Moderator: Amateur Radio Builders Group at Groups.IO.

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email:? bill@...

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From: [email protected] <[email protected]> On Behalf Of Tom - AJ8X via groups.io
Sent: Monday, April 14, 2025 1:14 PM
To: [email protected]
Subject: [AmateurRadioBuilders] Attenuator problem

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V12.6 RF board. 'Menu/RF Set/RF in Atten' works fine, I get the appropriate 3.3v at pins 21 - 26 as adjustments are made. But 'RF Out Atten' doesn't work the same. I don't see any voltage on pins 1 - 6 as adjustments are made. What am I missing?

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