[hpsdr] Pure Signal and ARC FAULT of linear amplifier

[Scott Traurig]

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
>
>
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