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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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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. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? 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? 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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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.
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-------- 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. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? 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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Added the following at line 748 of : ? ? ? ? ? ? SetRF_OutAtten(adjuster);
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. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? 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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Ok so the software wasn＊t there to adjust the TX attenuator.? How the heck did Al calibrate the output power then? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ?
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From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Monday, April 14, 2025 2:41 PM
To: [email protected]
Subject: Re: [AmateurRadioBuilders] Attenuator problem? Added the following at line 748 of : ? ? ? ? ? ? SetRF_OutAtten(adjuster); 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. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? 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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I can control output power. Am not near my T41 so can＊t test voltages dave, n3ds
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On Apr 14, 2025, at 3:41?PM, Oliver KI3P via groups.io <oliver@...> wrote:
? Added the following at line 748 of : ? ? ? ? ? ? SetRF_OutAtten(adjuster);
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. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? 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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??
On Monday, April 14, 2025 at 04:27:21 PM EDT, K9HZ <bill@...> wrote:
Ok so the software wasn＊t there to adjust the TX attenuator.? How the heck did Al calibrate the output power then? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ?
From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Monday, April 14, 2025 2:41 PM
To: [email protected]
Subject: Re: [AmateurRadioBuilders] Attenuator problem ? Added the following at line 748 of : ? ? ? ? ? ? SetRF_OutAtten(adjuster); 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. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? 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?
?
-- Jack, W8TEE
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To be clear: the software is there to control the output attenuator. There was a bug when trying to use the menu to do so, but this does not affect any of the calibration routines.
-------- Original Message -------- On 4/14/25 3:36 PM, Jack, W8TEE via groups.io wrote:
??
On Monday, April 14, 2025 at 04:27:21 PM EDT, K9HZ <bill@...> wrote:
Ok so the software wasn＊t there to adjust the TX attenuator.? How the heck did Al calibrate the output power then? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? Added the following at line 748 of : ? ? ? ? ? ? SetRF_OutAtten(adjuster); 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. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? 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?
?
-- Jack, W8TEE
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Ah ok that＊s for the clarification.? I had remembered that process working. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ?
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From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Monday, April 14, 2025 4:02 PM
To: [email protected]
Subject: Re: [AmateurRadioBuilders] Attenuator problem? To be clear: the software is there to control the output attenuator. There was a bug when trying to use the menu to do so, but this does not affect any of the calibration routines.
-------- Original Message --------
On 4/14/25 3:36 PM, Jack, W8TEE via groups.io wrote:
On Monday, April 14, 2025 at 04:27:21 PM EDT, K9HZ <bill@...> wrote: Ok so the software wasn＊t there to adjust the TX attenuator.? How the heck did Al calibrate the output power then? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? Added the following at line 748 of : ? ? ? ? ? ? SetRF_OutAtten(adjuster); 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. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois ? Owner 每 Operator Villa Grand Piton 每 J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? ? 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?
?
--
Jack, W8TEE
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I came across the attenuator problem chasing another problem ... probably didn't need to change U21 and U12 ...
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Thank you all for your help.?
?
Tom
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Tom - AJ8X
K9HZ
Jack, W8TEE