<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Scott and Pierre,<div class=""><br class=""></div><div class="">Thank you for your feedback to my question.</div><div class=""><br class=""></div><div class="">The error message produce by ACOM2000A may not always be correct.</div><div class="">I had been biased by this message “ARC FAULT”, only thinking this is a real arcing.</div><div class=""><br class=""></div><div class="">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.</div><div class="">In addition, I certainly understand that EBS is not going well with Pure-Signal.</div><div class=""><br class=""></div><div class="">Then the next question is raised as follows:</div><div class="">Why does the ARC FAULT occur with Pure-Signal and with EBS?</div><div class=""><br class=""></div><div class="">Disabling EBS may clear the problem as other OMs carried out.</div><div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">73,</div><div class="">Tokio</div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">2019/05/03 19:08、Scott Traurig <<a href="mailto:scott.traurig@gmail.com" class="">scott.traurig@gmail.com</a>>のメール:</div><br class="Apple-interchange-newline"><div class="">***** High Performance Software Defined Radio Discussion List *****<br class=""><br class=""><div dir="auto" class="">Sounds good, Pierre.<br class=""><br class=""><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Fri, May 3, 2019, 06:02 pierregros07 <<a href="mailto:pierregros07@gmail.com" class="">pierregros07@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto" class="">Dear scott, </div><div dir="auto" class="">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.</div><div dir="auto" class="">73! Pierre</div><div dir="auto" class=""><br class=""></div><div style="font-size: 100%;" dir="auto" class=""><div class="">-------- Message d'origine --------</div><div class="">De : Scott Traurig <<a href="mailto:scott.traurig@gmail.com" target="_blank" rel="noreferrer" class="">scott.traurig@gmail.com</a>> </div><div class="">Date : 02/05/2019 4:47 PM (GMT+01:00)</div><div class=""><br class=""></div></div><div dir="ltr" class=""><div class="">Please see below...</div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 2, 2019 at 1:31 AM Tokio Endo <<a href="mailto:endotokio@gmail.com" target="_blank" rel="noreferrer" class="">endotokio@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br class="">
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.<br class=""></blockquote><div class=""><br class=""></div><div class="">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.</div><div class=""> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">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. </blockquote><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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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.<br class=""></blockquote><div class=""><br class=""></div><div class="">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:</div><div class=""><br class=""></div><div class=""><a href="https://apache-labs.com/community/viewtopic.php?f=15&t=2593&p=4326&" target="_blank" rel="noreferrer" class="">https://apache-labs.com/community/viewtopic.php?f=15&t=2593&p=4326&</a></div><div class=""><br class=""></div><div class="">73,</div><div class=""><br class=""></div><div class="">Scott/w-u-2-o</div><div class=""><br class=""></div></div></div>
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