[hpsdr] Latest Janus block diagram and test results

[Christopher T. Day]

Phil,

Sounds great! {Oops, accidental pun.) Two small things:

1) ENOB means what? 
2) Would it make sense to put a pair of mini-B USB connectors on the
board for the balanced audio input from the quadrature detector? I know
that's not what they're for, but they are quite small and intrinsicly
deal with differential signals. It would be nice if someday someone made
a properly balanced and shielded audio output from the detector. Given
the perfomance you're quoting, I suspect that imbalance and noise on the
imput lines are not that far away from being a problem. Just a thought.


	Chris - AE6VK


-----Original Message-----
From: Phil Harman [mailto:pvharman at arach.net.au] 
Sent: Tuesday, May 23, 2006 6:28 AM
To: hpsdr at hpsdr.org
Subject: [hpsdr] Latest Janus block diagram and test results

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

All,

I've updated the block diagram of the Janus board based on the latest
circuit and breadboard prototype tests.

< http://www.hamsdr.com/personaldirectory.aspx?id=255 >

The figures from testing the prototype using the AK5394A are

Noise Floor = -160dBm (in 11Hz FFT bandwidth) Dynamic Range = 120dB ENOB
= 20

At 192kps the noise floor is totally flat.

Phil... VK6APH






--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.392 / Virus Database: 268.7.0/345 - Release Date:
22/05/2006

_______________________________________________
HPSDR Discussion List
To post msg: hpsdr at hpsdr.org
Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
HPSDR web page: http://hpsdr.org
Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/


 1148403821.0