[hpsdr] OXDR HPSDR/SDR1000 In A Box

[john_eckert at agilent.com]

Hi Alf,

Wood's good!

As for the power meter, I just used the same ADC that the SDR1000 uses
on the 100W board.  However, I drive it with peak detectors.  That way
I get accurate power measurements on SSB.

The set up goes like this:

		dual directional coupler, rf sample rectified
		dual rail to rail op amp configured as two pk detectors
		detectors drive ADC
		PowerSDR read the values if you tell it you have PA installed

I modified the PowerSDR code for fullscale of 3KW.

If you can read Eagle schematic files I can make them available.

Regards,
John
k2ox

> >_______________________________________________
> >  
> >
> That is a VERY fine piece of work! Thank you for sharing the 
> pictures. I 
> will _not_ post images of my AJO system screwed to a piece of wood.
> 
> On page 7 you said:
> 
> "Here is the power meter board. The OXDR drives a legal limit solid 
> state amplifier and the power meter board monitors the amplifiers 
> forward and reflected power. The results are shown on the 
> PowerSDR console."
> 
> How did you get that info back into PowerSDR? I have a similar setup, 
> with the LP SDR1000 driving an external HB amplifier, and I'd like to 
> have the power info on the screen. I have a calibrated directional 
> coupler, but right now it's feeding a pair of analog meters. Any tips 
> would be appreciated.
> 
> 73  Alf  NU8I
> Scottsdale  AZ  DM43an
> 160m > 10Gigs
> 

 1181007167.0