[hpsdr] Pure Signal and ARC FAULT of linear amplifier

[Scott Traurig]

Hi Tokio,

If you read the link I posted below, you will see that there are
intentional features in the ACOM600 that prevent it from working with
two-tone type test signals. They might also be in the ACOM2000. I suggest
you contact ACOM directly to ask them the question.

In the meantime, if PureSignal works with EBS disabled, then that is what I
recommend.

73!

Scott/w-u-2-o

On Fri, May 3, 2019 at 7:12 PM Tokio Endo <endotokio at gmail.com> wrote:

> 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> 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>
>> 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> 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&
>>
>> 73,
>>
>> Scott/w-u-2-o
>>
>> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help:
> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20190504/92efc773/attachment.html>