[hpsdr] Atlas based HPSDR PureSignal

[georg Prinz]

Hi Bruce,

you are right! I didn´t notice the Dual Log Amp. But with a small 
modification it should be possible to
use the 4-pin socket at Alex for this purpose? Usually this plug is not 
used,as the power-information
is also present at the 10 pin ribbon-cable socket. We need a separate 
cable from the coupler to the plug and cut the
output of the log amp.

Is this feasible?

73, Georg, DL2KP







Am 29.01.2014 12:30, schrieb Bruce Beford:
> ***** 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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