Re: [softrock40] Re: More direct IQ software
http://www.w1hkj.com/Fldigi.html and the latest version is fldigi-3.21.33 which I am using with openSUSE 12.1 Milestone 0. 73 ... Sid.
On 31/12/11 23:35, John Greusel wrote:Mike,
I've been googling and found some very interesting correspondence-
Apparently the IQ issue has been worked on behind the scene for some time and Dave may be right that it's not a component of Hamlib. It may however be an element of Fldigi.
From: MIKE DURKIN <Patriot121@...>
Sent: Saturday, December 31, 2011 4:24 PM
Subject: RE: [softrock40] Re: More direct IQ software
How does it accomplish the phase and balance for image suppression during transmit?
Date: Sat, 31 Dec 2011 15:58:20 -0600
Subject: Re: [softrock40] Re: More direct IQ software
I got it working. Apparently fldigi's modem can take the direct I/Q and demodulate it. Perhaps all that PSDR is doing on VAC is a straight pass-thru. I am not happy with the resolution on the waterfall (had to run the gain all the way up to see signals) but that may be more config work on my part to get it working. I was able to complete a few QSOs today on PSK31 and PSK125 so much progress.
On 12/31/2011 3:28 PM, Dave wrote:Sory to say, but HamLib does NOT handle the SDR I/Q IF to Audio
conversion, it only handles the control of the Si570.
There was talk of someone else creating an I/Q front end for FlDigi, but
I don't know if it ever saw the light of day, yet.
Talk to Dave the author of FlDigi, his contacts are in the help, and on
Else, use any of the existing SDR processing app's to handle the I/Q
processing back to baseband, and whatever means to get it into FlDigi.
Note, some soundcards can use the Mono (or Stereo) "Mix" function to take
a sample of the recovered audio, and make it available for another app to
use, if you set the OS's "Default Recording" portal, to be the "Mix"
function of the baseband Audio I/O card, but that only generaly works OK,
if you use separate soundcards for the I/Q and Baseband streams.
-- John Williams KE5SSH - ham since 2007 WQKA523 - GMRS for family use on the farm
-- Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot, Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support Senior Staff Specialist, Cricket Coach Microsoft Windows Free Zone - Linux used for all Computing Tasks