[hpsdr] Atlas based HPSDR PureSignal

[Helmut, DC6NY]

Hi Georg,

you have to provide the necessary isolation or crosstalk attenuation. More
over you have to pick up the sample in front of the rectifier diode. Thin
coax wiring seems indispensible to get at least 75 dB att.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von georg Prinz
Gesendet: Mittwoch, 29. Januar 2014 13:14
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Atlas based HPSDR PureSignal

***** High Performance Software Defined Radio Discussion List *****

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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