[hpsdr] [Fwd: IQOUT: Test tool for SDR transmitters]

[Ken - N9VV]

F.Y.I. Duncan M0KGK has coded a really nifty Tx testing program



-------- Original Message --------
Subject: [softrock40] IQOUT: Test tool for SDR transmitters
Date: 	Sun, 05 Nov 2006 18:37:17 -0000
From: 	Duncan Munro <m0kgk at duncanamps.com>

For those doing the run of the latest Softrock transmitter, I've put
together a test tool to exercise the TX side.

As well as the mandatory tone generation with 90 degree spacing, it
also has adjustments for the following:

* Overall output
* Frequency
* I/Q amplitude ratio
* I/Q phase difference
* Mute left or right

It will use either normal Windows driver soundcards or ASIO cards for
output. Finally, it can key the Softrock TX on and off using the
serial port.

The mute left or right might seem a bit pointless, but I've been
suffering from 100% imaging on TX output. Muting left makes the TX
silent, muting right does nothing so that gives me a few clues as to
where to look :-)

Download is from http://www.m0kgk.co.uk/sdr/download.php
<http://www.m0kgk.co.uk/sdr/download.php> second item
on the list.

73,

Duncan M0KGK