[hpsdr] cycling of PS

[Bill Diaz]

Glen,
     What radio model do you have?
Bill KC9XG

On 8/4/2017 5:43 PM, K4KV wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Bill,
>
> I see what is happening, and think I know why it is going wrong.
>
> I tried it at 50-100W level, and it works fb with the input attenuator 
> at 0db.  It also works fb with 12% drive to
>
> the amp and 600W out.
>
> As soon as I exceed that power level, it goes into a cycling mode.  Up 
> and down flashing all over the place.
>
>
> I had reported, and others have reported that PSDR does not handle my 
> 6-bit attenuator, but I have a board with
>
> a 5-bit attenuator and it works as it should.  When the program 
> attempts to start raising the attenuator value to
>
> reduce the PS input level, who knows what the attenuator is really 
> doing.  I have seen the attenuator in rx mode
>
> jump all over the place, incrementing 1 db at a time.
>
> This 6-bit attenuator does not do this in Thetis, and works well.
>
> I am going to uncheck the auto-attenuate box and try my own attempt at 
> limiting the PS input signal for full amp
>
> output...
>
> 73
>
> Glen K4KV
>
>
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