[hpsdr] Pure Signal and ARC FAULT of linear amplifier

[Tokio Endo]

Hi Scott and Pierre,

Thank you for your feedback to my question.

The error message produce by ACOM2000A may not always be correct.
I had been biased by this message “ARC FAULT”,  only thinking this is a real arcing.

In spite of the above, it is very certain that my ARC FAULT is happening with Pure-Signal function enabled as well as with EBS.
In addition, I certainly understand that EBS is not going well with Pure-Signal.

Then the next question is raised as follows:
Why does the ARC FAULT occur with Pure-Signal and with EBS?

Disabling EBS may clear the problem as other OMs carried out.

I would like to investigate some measures for AOM2000A to resolve the problem, since the adaptive algorithm of Pure-Signal is a part not to be touched by me.

73,
Tokio

> 2019/05/03 19:08、Scott Traurig <scott.traurig at gmail.com>のメール:
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Sounds good, Pierre.
> 
> On Fri, May 3, 2019, 06:02 pierregros07 <pierregros07 at gmail.com <mailto:pierregros07 at gmail.com>> wrote:
> Dear scott, 
> I suppose the same goes with O M. POWER 2000A+ which also has bias cutoff when input Power is below 0,1 watt. I'll check and report back the results on Puresignal Thetis when EBS is on and off.
> 73! Pierre
> 
> -------- Message d'origine --------
> De : Scott Traurig <scott.traurig at gmail.com <mailto:scott.traurig at gmail.com>>
> Date : 02/05/2019 4:47 PM (GMT+01:00)
> 
> Please see below...
> 
> On Thu, May 2, 2019 at 1:31 AM Tokio Endo <endotokio at gmail.com <mailto:endotokio at gmail.com>> wrote:
> 
> Recently I’ve begun to use ACOM2000A, manufactured in 2009 with original EBS, instead of TL-922. The other equipment remains the same as TL-922 configurations, including a directional coupler, Xtronic XDC-4SO. The reason why I preferTL-922 is EBS of ACOM2000A which changes the bias during transmission which causes the abrupt change of amplifier behavior which I think it is not good for Pre-distortion.
> 
> Any type of dynamic bias control in an external amplifier will cause PureSignal not to work. The amplifier bias control and PureSignal will "chase each other's tails" and you will never get a stable solution. Dynamic bias must be turned off or defeated somehow.
>  
> Using ACOM2000A with Pure Signal, more precisely the PS button ON of PowerSDR, ACOM2000A trips due to ARC FAULT while I have SSB QSO. In CW and FT8, ARC FAULT never happens even with 1.5KW. FYI I don’t use 1.5KW for FT8. 
> 
> With PS button OFF, NO ARC FAULT occurs with SSB QSO. I am obliged to think that the CAUSE of ARC FAULT is Pure Signal due to a very short period of spike of an exciter power, maybe, during the period when EBS works as well as the adaptive functionality of Pure Signal.
> 
> The problem is not with PureSignal, and there are no "spikes" or overshoots in the RF waveform coming out of the Hermes. It is possible that the TS-940 amp could somehow be at fault. However experience suggests that it is the ACOM that is the problem. Many people have reported issues with PureSignal and ACOM amplifiers. For example:
> 
> https://apache-labs.com/community/viewtopic.php?f=15&t=2593&p=4326& <https://apache-labs.com/community/viewtopic.php?f=15&t=2593&p=4326&>
> 
> 73,
> 
> Scott/w-u-2-o
> 
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