Max Power setting not working after upgrade to 2.3.7.110

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  • Updated 1 year ago
  • (Edited)
The max power setting is being ignored after upgrading to 2.3.7.110. It used to work fine.


I set the power limit to 15 watts but then am able to increase power to 100 watts. This is not good as the one amp I'm using has a limit of 15 watts for input and 100 may fry it. Now I have to be extra careful of the power levels. This should be fixed ASAP.


Flex 6700
Windows 8.1
Direct Connect

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Pat N6PAT

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Posted 1 year ago

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Bill -VA3WTB

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If you click on and off the ALC button it will set it and keep it there.
You really should make a profile for that amp and save the power setting as you want it.
Transmit profiles...
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Pat N6PAT

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Clicking the ALC on and off does not fix the problem. The Power levels can still be cranked up to 100 even though I set it to 10 or 15 or 20 as the power max.

Profiles should not be used as a workaround for a bug that is causing a safeguard to no longer function.  There's a reason for a global power limit.

This worked fine prior to the upgrade and is a serious bug
(Edited)
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Pat N6PAT

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From the Flex hardware manual concerning ALC:

Δ – Please note this input is provided as a safety measure for external amplifiers. It is NOT meant to be used in regular operation as an active power control input or to modify the “attack” of an external amplifier. Almost all modern HF amplifier manufacturers discourage the use of ALC in normal operation. In fact, many amplifiers do not have ALC implemented.
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KF4HR

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The OP makes a good point.  If a particular function is working properly up until a software change occurs, obviously there's a software issue to fix.  Having that ability to limit exciter drive level would be particular important depending on the brand aned specs of amp being used.

As for the verbiage in the Flex hardware manual stating "almost all modern amplifier manufacturers discourage the use of ALC..."  That's certainly not the case with ICOM equipment.  And several Ameritron amplifiers have a ALC control right on the front panel. 

If an operator opts not to use ALC that's fine, but they should have some means, such as a sampler to monitor RF trapezoid pattern, in order to insure the exciter is over driving the amplifier, which could result in splatter and distortion.   
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Bill -VA3WTB

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Yes, profiles are meant to be used to to make different power settings for many reasons. You make a profile with all settings you need, then open that profile with the setting you want.

On my radio It will not keep the power setting were I want it unless I turn on and off the ALC button, maybe it's just my radio that it works on.
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W8WD

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Pat,

I agree something has changed in the software. I am running a 6600M and Maestro. In the past when I set the Max Power to a specific level, adjusting the PWR on the Maestro would not go beyond the Max Power value. Now it can go all the way to 100%.

Personally, I prefer the Max Power to limit the radio so that it can not be adjusted beyond that value and accidently over drive the amplifier.

When I load a new profile, the power is limited to the Max power, but can be manual adjusted up to 100%. 

Cycling the ALC Enable/disable makes no difference, and as you pointed out it’s a bandage fix even if it worked. 

I hope Flex will re-think reasoning for making this change, it was more useful in the original implementation.  

Brian/W8WD

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Pat N6PAT

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I think it's a bug rather than a change.
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WW1SS - Steve

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I just checked mine. I have Max power set for 60 watts. When I set the RF slider full right all I will get out of the radio is 60 watts.
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Pat N6PAT

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Yes. Mine does the same thing. The power is not increasing but the slider will go to 100.

Also, if you set max power to 15 and have both RF and tuner set beyond that level both sliders move to 15. You will not be able to move the tuner past 15 but the RF slider will still go to 100

Something in the upgrade caused a problem with the RF control where it no longer indicates the correct power level.
(Edited)
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FRED W9TB

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My 6600M if set max 50 will still do 100+ I did get it 50 max once and had to do restart to get to go back to 100.Has to be a bug !