[hpsdr] ADC for VSWR Measurement

[Graham KE9H]

Gerd:

There is a ribbon jumper cable that connects the SPI bus to
both ALEX TX and RX cards.  The 0 to 3 volt DC (corresponding
to 0 to 100 Watt) signal from the TX directional couplers appears on 
both the
control ribbon cable, as well as a 4 pin auxilliary connector on the
TX board.

See the picture of the ALEX alpha-3 on the Wiki.  You can see
a white four pin connector labled "J2" just below the main ribbon
cable connector on the transmit board.

--- Graham




Gerd Loch wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Phil,
>
> thanks for the answer.
>
> For my understanding: how are you going to feed the I2C signals on both Alex
> RX and TX - 2 connectors on the ribbon cable?
> Where is J2 on Alex with the analog signals FWD/REF PWR connected to?
>
> 73, Gerd
> DJ8AY
>
>
> -----Ursprüngliche Nachricht-----
> Von: Phil Harman [mailto:phil at pharman.org] 
> Gesendet: Samstag, 23. August 2008 13:17
> An: g.loch at nt-electronics.de; hpsdr at hpsdr.org
> Betreff: Re: [hpsdr] ADC for VSWR Measurement
>
> Hi Gerd,
>
> If it  is already a digital signal at say 0-3v then you could connect it 
> directly to a spare pin(s) on the Atlas bus. The currently used pins are in 
> SVN under
>
> /trunk/Atlas/Atlas to Janus V2 - OzyV2-Penelope Interface.xls.
>
> It they are analogue signals then you could use some of the spare four ADC 
> inputs on Penelope at either P4 or J6.
>
> The Forward and Reflected power signals from the Alex LPF filter board will 
> be available on the ribbon connector that connects Alex  to Mercury. From 
> Mercury you will be able to jumper across to Penelope to pick up the ADC and
>
> hence monitor Fwd/Ref volts and then calculate  Power out, Z,  SWR etc on 
> the PC. With 100w out of Alex  the log corrected directional coupler will 
> read down to 100mW. This can be set lower if you want to run your PA below 
> the 100w level.
>
> 73's Phil....VK6APH
>
>
>
>
> ----- Original Message ----- 
> From: "Gerd Loch" <g.loch at nt-electronics.de>
> To: <hpsdr at hpsdr.org>
> Sent: Saturday, August 23, 2008 5:35 AM
> Subject: [hpsdr] ADC for VSWR Measurement
>
>
>   
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Where can one connect the Dout of the ADC (VSWR of a PA) to in the HPSDR
>> hardware ?
>>
>> 73, Gerd
>> DJ8AY
>>
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>>     
>
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