[hpsdr] Atlas based HPSDR PureSignal

[Georg Prinz]

Hi,

could anybody point us to the description made by Abhi. Apach Labs web
site doesn reveal it.

73, Georg


Am Mittwoch, den 29.01.2014, 13:33 +0100 schrieb Kjell Karlsen:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi Bruce.
> 
> I have used the directional coupler on Alex for feedback of the signal to  
> Hermes. But of course I do not use the DC! I just take the FWD RF signal  
>  from the junction between R2 and D1, then via an attenuator to X1, the  
> internal connection to the Alex HPF. This connection and attenuator is  
> easily installed on the PCB using a short length of mini coax and some  
> 0803 SMD components. Abhi has described this for ANAN-100/ 100D. I think  
> it is on the Apache Labs site somewhere.
> 
> If you use an external PA, then you need an external Directional Coupler  
> too.
> 
> 73, Kjell
> 
> 
> 
> 
> På Wed, 29 Jan 2014 12:30:36 +0100, skrev Bruce Beford  
> <bruce.beford at myfairpoint.net>:
> 
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > Hi George.
> > No, we cannot use the DC voltage from the SWR bridge on Alex. We need to
> > feed back a sample of the actual RF waveform to the receiver ADC on  
> > Mercury
> > for pre-distortion compensation to work. This will require a separate
> > coupler or "sniffer".
> > Regards,
> > Bruce N1RX
> >
> >> Hi Phil,
> >> actually, in Atlas based systems there is an Alex transmit board with a
> >> RF power directional coupler installed. These dc voltages from the
> >> coupler provided at the 4-pin connector, could they be used for
> >> predistortion? Or do we need an additional coupler when all the
> >> modifications you described are done?
> >> 72, Georg, dl2kp
> >
> >
> >
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